As filed with the Securities and Exchange Commission on February 28, 2003

                                                     Registration No. 333-100673
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 AMENDMENT NO. 3
                                       TO
                                    FORM SB-2
                             REGISTRATION STATEMENT
                        Under The Securities Act Of 1933

                                  NEPHROS, INC.
             (Exact name of registrant as specified in its charter)

        Delaware                     3841                       13-3971809
    (State or other      (Primary Standard Industrial          (IRS Employer
    jurisdiction of       Classification Code Number)         Identification
    incorporation or                                              Number)
     organization)

                                  3960 Broadway
                            New York, New York 10032
                                 (212) 781-5113
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                                 Norman J. Barta
                      President and Chief Executive Officer
                                  3960 Broadway
                            New York, New York 10032
                                 (212) 781-5113
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                        Copies of all communications to:

         Peter Smith, Esq.
         Monica Lord, Esq.                     Alan J. Schaeffer, Esq.
Kramer Levin Naftalis & Frankel LLP            McDermott, Will & Emery
         919 Third Avenue                    600 Thirteenth Street, N.W.
     New York, New York 10022                    Washington DC 20005
          (212) 715-9100                             202-756-8000

Approximate date of commencement of proposed sale to the public: As soon as
practicable after the Registration Statement becomes effective.

If this form is filed to register additional securities for an offering
      pursuant to Rule 462(b) under the Securities Act of 1933, check the
      following box and list the Securities Act registration statement number of
      the earlier effective registration statement for the same offering. |_|

If this form is a post-effective amendment filed pursuant to Rule 462(c) under
     the Securities Act of 1933, check the following box and list the Securities
     Act registration statement number of the earlier effective registration
     statement for the same offering. |_|

If this form is a post-effective amendment filed pursuant to Rule 462(d) under
     the Securities Act of 1933, check the following box and list the Securities
     Act registration statement number of the earlier effective registration
     statement for the same offering. |_|

If delivery of the prospectus is expected to be made pursuant to Rule 434,
      check the following box. |_|



                                                       CALCULATION OF REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                     Proposed Maximum
Title of Each Class of Securities     Amount to be         Proposed Maximum              Aggregate                   Amount of
         to be Registered              Registered      Offering Price Per Share      Offering Price(1)           Registration Fee
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                         
common stock, $.001 par value per       2,875,000               $7.00                 $20,125,000(2)                 $1851.50
share
- ------------------------------------------------------------------------------------------------------------------------------------


      (1)   Estimated solely for the purpose of calculating the amount of the
            registration fee in accordance with Rule 457 under the Securities
            Act of 1933.

      (2)   Includes 375,000 shares of common stock which may be purchased by
            the underwriters to cover over-allotments, if any.

      The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.

================================================================================


      The information in this prospectus is not complete and may be changed.
These securities may not be sold until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to sell these securities and it is not soliciting an offer to buy these
securities in any state where the offer or sale is not permitted.

                 Subject to completion: dated February 28, 2003

PROSPECTUS

                                2,500,000 Shares

                                 [LOGO] Nephros

                                  Common Stock

                                   ----------

      Nephros, Inc. is offering 2,500,000 shares of its common stock.

      This is our initial public offering. We have applied to have our common
stock approved for quotation on the American Stock Exchange LLC under the symbol
"NEP." The initial public offering price will be between $6.00 and $7.00 per
share.

                                   ----------

      Investing in our common stock involves a high degree of risk. See "Risk
Factors" beginning on page 6.

                                   ----------

      Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.

================================================================================
                                                  Per Share       Total
- --------------------------------------------------------------------------------
Public Offering Price (1).....................      $6.000      $15,000,000
Underwriting Discounts and Commissions........      $0.528      $ 1,325,000
Proceeds to Nephros, Inc. (2).................      $5.472      $13,675,000
================================================================================

(1)   Information set forth in this table is based on an assumed initial public
      offering price of $6.00 per share.

(2)   Before deducting expenses of this offering which are estimated to be
      $1,725,000.

      The underwriters have an option to purchase up to an additional 375,000
shares of common stock from us to cover over-allotments. The underwriters are
offering the shares on a firm commitment basis. The underwriters expect to
deliver the shares to purchasers on or about ________, 2003.

GunnAllen Financial, Inc.                                THE SHEMANO GROUP, INC.

                                   ----------

                   The date of this prospectus is _____, 2003


               [INSIDE FRONT COVER PAGE - DESCRIPTION OF ARTWORK]

The top left of the inside front cover contains a color photograph of two
OLpur(TM) MD190's, our disposable dialyzers for use with hemodiafiltration
machines. The following text appears to the right of the photograph: "OLpur(TM)
MD190 Our hollow fiber filter designed specifically for mid-dilution
hemodiafiltration."

The bottom right of the inside front cover contains a color photograph of the
OLpur(TM) H(2)H(TM), our add-on module that can convert a hemodialysis machine
into a hemodiafiltration-capable machine. The OLpur(TM) H(2)H(TM) in the
photograph contains our logo. The following text appears to the left of the
photograph "OLpur(TM) H(2)H(TM) H(2)H module can convert current dialysis
machines into hemodiafiltration-capable systems."

The bottom left of the inside front cover page contains our logo.


                                TABLE OF CONTENTS

Prospectus Summary..........................................................1

Risk Factors................................................................6

Cautionary Note Regarding Forward Looking Statements.......................16

Important Assumptions in this Prospectus...................................17

Use of Proceeds............................................................18

Dividend Policy............................................................19

Capitalization.............................................................20

Dilution...................................................................22

Selected Financial Information.............................................24

Management's Discussion and Analysis of Financial
     Condition and Results of Operations...................................26

Business...................................................................32

Management.................................................................48

Certain Transactions.......................................................54

Principal Stockholders.....................................................56

Description of Securities..................................................58

Shares Eligible for Future Sale............................................62

Underwriting...............................................................64

Transfer Agent and Registrar...............................................66

Legal Matters..............................................................66

Experts....................................................................66

Disclosure of Commission Position on Indemnification
for Securities Act Liabilities.............................................66

Where You Can Find More Information........................................66

Index to Financial Statements.............................................F-1


                                       2


                               PROSPECTUS SUMMARY

      This summary highlights information contained elsewhere in this
prospectus. This summary is not complete and does not contain all the
information you should consider before buying shares of our common stock in this
offering. You should read this entire prospectus carefully, especially the
investment risks discussed under "Risk Factors."

                                  NEPHROS, INC.

Company Background

We are a development stage medical device and technology company that was
founded in 1997 by health professionals, scientists and engineers affiliated
with Columbia University to develop cost-effective, improved products for End
Stage Renal Disease, or ESRD, therapy. We have not derived any revenues from our
operations, hold minimal assets and have incurred losses since our inception
primarily as a result of our research and development efforts. To date, we have
relied on private sales of our securities and loans from our shareholders to
fund operations.

      Our goal is to develop and market technologies and products to improve the
efficacy of ESRD therapy and, ultimately, the health of ESRD patients and, at
the same time, address the financial needs of dialysis clinics and other
providers of ESRD therapy.

      We are incorporated under the laws of the State of Delaware. We maintain
our principal executive offices at 3960 Broadway, New York, New York 10032. Our
telephone number at that address is (212) 781-5113.

The Offering

Common stock offered by us               2,500,000 shares

Common stock to be outstanding after     6,123,158 shares. This does not
this offering                            include:

                                         o     375,000 shares of common
                                               stock reserved for issuance
                                               upon exercise of the
                                               underwriters' over-allotment
                                               option;

                                         o     250,000 shares of common
                                               stock reserved for issuance
                                               upon exercise of the
                                               underwriters' warrants;

                                         o     783,876 shares of common
                                               stock underlying stock
                                               options granted and
                                               outstanding pursuant to our
                                               equity incentive plan;

                                         o     128,154 shares of common
                                               stock underlying stock
                                               options to be granted to our
                                               president and chief executive
                                               officer pursuant to our
                                               equity incentive plan prior
                                               to the consummation of this
                                               offering;

                                         o     30,000 shares of common stock
                                               underlying stock options to
                                               be granted to certain of our
                                               directors pursuant to our
                                               equity incentive plan upon
                                               the consummation of this
                                               offering;

                                         o     134,899 shares of common
                                               stock issuable upon exercise
                                               of warrants issued in June
                                               2002 to a former supplier;
                                               See "Description of
                                               Securities -- Other Warrants"
                                               and "Business -- Settlement
                                               Agreements;"

                                         o     28,104 shares of common stock
                                               issuable upon conversion of
                                               shares of our series A
                                               preferred stock which are
                                               themselves issuable upon
                                               exercise of warrants issued
                                               to convertible note holders;

                                         o     75,000 shares of common stock
                                               issuable upon exercise of
                                               warrants issued to a lender.
                                               See "Description of
                                               Securities -- Other Warrants"
                                               and "Business -- Settlement
                                               Agreements;" or

                                         o     60,000 shares of common stock
                                               issuable upon exercise of
                                               warrants expected to be issued to
                                               a placement agent. See
                                               "Description of Securities --
                                               Other Warrants" and "Business --
                                               Settlement Agreements."

                                         You should read the discussion under
                                         the heading "Capitalization" for more
                                         information regarding outstanding
                                         shares of our common stock, warrants or
                                         options to purchase our common stock.
                                         You should also read the discussion
                                         under the heading "Underwriting" for
                                         more information regarding the
                                         underwriters' over-allotment option and
                                         the discussion under


                                       1


                                         the heading "Important Assumptions in
                                         this Prospectus" for information about
                                         certain important assumptions we have
                                         made in this prospectus.

We currently intend to use the net       o     marketing and sales;
proceeds of this offering for:
                                         o     clinical trials;

                                         o     regulatory approvals;

                                         o     research and development;

                                         o     payment of certain dividends
                                               on our convertible stock;

                                         o     repayment of loans to a
                                               related party and three other
                                               lenders;

                                         o     payment of amounts due under
                                               a settlement agreement with a
                                               former supplier;

                                         o     working capital; and

                                         o     general corporate purposes.

                                         You should read the discussion
                                         under the heading "Use of Proceeds"
                                         for more information.

Proposed American Stock Exchange         NEP
Symbol:

Our Business

      We have developed a next-generation hemodiafiltration, or HDF, device and
related products and technologies for treating patients with ESRD. We are
focused on bringing these devices and technologies to market, initially in
western Europe and then in the United States and worldwide.

      ESRD is the stage of advanced chronic kidney disease characterized by the
irreversible loss of kidney function. Healthy kidneys remove waste products and
excess water from the blood, thus preventing toxin buildup and fluid overload.
ESRD patients require either kidney transplantation or ongoing treatment in the
form of renal replacement therapy to perform these functions and to sustain
life. Because the shortage of compatible kidneys limits the transplantation
option, most ESRD patients must rely on renal replacement therapy for the
functions normally provided by a healthy kidney. Once all residual function of
the ESRD patient's kidneys has ceased, the patient may seek extracorporeal renal
replacement therapies for adequate treatment.

Existing extracorporeal renal replacement therapies currently include:

      o     Hemodialysis - the patient's blood is filtered through a
            semi-permeable filter known as a dialyzer which allows for the
            diffusion of waste products and excess water into a solution for
            dialysis known as dialysate.

      o     Hemofiltration - the patient's blood is filtered through a
            semi-permeable membrane, using a negative pressure similar to a
            vacuum effect, or a convection process, to draw out solute particles
            without using a dialysate solution.

      o     Hemodiafiltration (HDF) - combines the diffusion process of
            hemodialysis with the convection process of hemofiltration to
            eliminate waste products and excess water.

      Currently, hemodialysis is the most widely used extracorporeal renal
replacement therapy. Hemodialysis removes excess water and some waste products
sufficiently to sustain life but fails, in our view, to address adequately the
long-term health and quality of life of the ESRD patient. According to an
article by H. Tang et al. in the Hong Kong Journal of Nephrology, published in
2001, the HDF process offers statistically significant improvement over
hemodialysis therapies by removing more larger toxins (known in the industry as
"middle molecules" because of their heavier molecular weight) at a faster rate.
Accordingly, we plan to focus on the HDF segment of the extracorporeal renal
replacement market. The dialyzer (also referred to as a "dialysis filter" or an
"artificial kidney") is an essential component of dialysis machines and is used
in hemodialysis and HDF. Our first product will be a disposable dialyzer for use
with HDF machines.

Our Technology

      We have developed three products with our patented technology that we
believe will improve the HDF treatment efficacy beyond both hemodialysis and
current HDF therapies and, therefore, will encourage and facilitate HDF therapy
in dialysis clinics. Our goal is to introduce these new products to the market
over the next four years. We believe our technology and devices will:

            o     reduce hospitalization, medication and care costs;


                                       2


            o     reduce patient drug requirements;

            o     improve blood pressure control for the dialysis patient; and

            o     potentially improve the patient's health generally and the
                  patient's overall quality of life.

Our Products

OLpur(TM) MD190: our disposable dialyzer for use with HDF machines. When
compared to existing HDF standards in laboratory bench studies conducted by
members of our research and development staff, the OLpur(TM) MD190 improves
toxin removal by over 80% for a range of toxins, and in particular, middle
molecules. Subject to receipt of regulatory approval in the European Union
(which we anticipate obtaining during the spring of 2003), we plan to begin
selling the OLpur(TM) MD190 in western Europe in the spring of 2003.

      OLpur(TM) H(2)H(TM): an add-on module controlled by advanced software with
a simplified user interface that can convert a hemodialysis machine into an
HDF-capable machine. The combined systems can then be used to deliver HDF
therapy with the OLpur(TM) MD190. A prototype OLpur(TM) H(2)H(TM) module has
been developed and bench-tested in our laboratories by members of our research
and development staff; however, we must first obtain regulatory approval before
selling this product. We anticipate obtaining approval in the United States and
western Europe no earlier than the spring of 2004.

      OLpur(TM) NS2000: our advanced standalone HDF machine and associated
filter technology that we believe will offer improved clinical performance for
the ESRD patient and will provide a substantial financial benefit to dialysis
clinics. A prototype OLpur(TM) NS2000 system has been developed and bench-tested
in our laboratories by members of our research and development staff, but we
must first obtain regulatory approval before selling this product. We anticipate
obtaining approval in the United States no earlier than the last quarter of
2005.

The Market

      According to an article by M.J. Lysaght, Professor of Medical Science and
Engineering at Brown University, published in the Journal of American Society of
Nephrology in January 2002 (the "Lysaght Article"), as of mid-year 2001, the
number of ESRD patients worldwide was estimated to be over 1.1 million and the
size of this population has been expanding at a rate of approximately 7% per
year. According to the same article, the number of dialysis patients worldwide
is expected to be over two million by 2010, assuming current trends in ESRD
prevalence continue. Based on a report on the dialysis industry prepared by
Merrill Lynch & Co., Inc. in September 2001 (the "Merrill Report"), and by our
calculations, we estimate that of the dialysis patients worldwide, approximately
27% are in the United States, approximately 23% are in Europe and approximately
50% are in regions outside of the United States and Europe.

      Pursuant to Frost & Sullivan's 1997 World Renal Replacement Therapies
Equipment and Supply Market Report (the "1997 Frost & Sullivan Report"), the
world hemodialysis dialyzer market was projected to be $3.53 billion and to be
growing at a rate of approximately 10.8% per year in 2002. Based on this report,
we project that the worldwide hemodialysis dialyzer market alone could reach $8
billion by 2010.

Our Marketing Strategy

      We intend to generate market acceptance and market share for our products
through the following three-stage approach:

      o     Once we receive regulatory approval, we will introduce our OLpur(TM)
            MD190 through dialysis clinics in western Europe because of the
            presence in western Europe of the HDF process and HDF machines that
            are compatible with the OLpur(TM) MD190 and because of the enhanced
            opportunity for OLpur(TM) MD190 sales in western Europe; currently
            dialyzers generally are used only once in European dialysis clinics
            rather than reprocessed and reused.

      o     After introducing the OLpur(TM) MD190 in western Europe for existing
            HDF machines, once we obtain regulatory approval, we intend to
            introduce our OLpur(TM) H(2)H(TM) device to convert dialysis
            machines to HDF-enabled, and therefore OLpur(TM) MD190-capable,
            units. We believe the OLpur(TM) H(2)H(TM) will expand our OLpur(TM)
            MD190 market opportunity in western Europe. We also intend to
            simultaneously introduce the OLpur(TM) H(2)H(TM) and the OLpur(TM)
            MD190 in the United States as soon as we receive the requisite FDA
            approval. We believe that these product introductions will open the
            U.S. markets to the utilization of HDF therapy.

      o     After we have acclimated dialysis clinics and patients to improved
            HDF technology through our OLpur(TM) MD190 and OLpur(TM) H(2)H(TM)
            products and after we have received the requisite regulatory
            approval, we intend to introduce our OLpur(TM) NS2000 stand-alone
            HDF system to provide an upgrade in treatment performance and
            efficiency.


                                       3


                             SUMMARY FINANCIAL DATA

      The following summary financial data should be read in connection with,
and are qualified by reference to, the financial statements and related notes
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations" appearing elsewhere in this prospectus. The statement of operations
data for the years ended December 31, 2002 and 2001 and for the period from our
inception on April 3, 1997 through December 31, 2002 and the balance sheet data
as of December 31, 2002 are derived from our financial statements, which have
been audited by Grant Thornton LLP, independent auditors. All share and per
share data give effect to an amendment to our certificate of incorporation to be
filed prior to the effectiveness of the registration statement to which this
prospectus relates which, among other things, will effect a reverse stock split
pursuant to which each share of our common stock then outstanding will be
converted into 0.2248318 of one share of our common stock.

Statement of Operations Data



                                                      From            Year Ended
                                                 Inception to
                                                  December 31,   December 31,   December 31,
                                                     2002           2002           2001
                                                 ------------    -----------    -----------
                                                                       
Revenue - other                                  $    300,000    $        --    $   300,000

Operating Expenses:
    Research and development                        9,955,645        957,616        737,858
    General and administrative                      4,360,058      1,097,400        652,828
                                                 ------------    -----------    -----------
Loss from operations                              (14,015,703)    (2,055,016)    (1,090,686)

Other income, net                                     152,990        362,026          5,497
                                                 ------------    -----------    -----------

Net loss                                          (14,168,693)    (2,417,042)    (1,085,189)
Cumulative preferred dividends and accretion         (848,000)      (365,000)      (314,000)
                                                 ------------    -----------    -----------
Net loss attributable to common stockholders      (15,016,693)    (2,782,042)    (1,399,189)
                                                 ============    ===========    ===========
Net loss per share:
    Basic and Diluted                                            $     (2.21)   $     (1.11)
                                                                 ===========    ===========
Weighted average shares outstanding:
    Basic and Diluted                                              1,261,194      1,259,957
                                                                 ===========    ===========

Pro forma per share data (unaudited):
Pro forma net loss per share (1)
    Basic and Diluted                                            $     (0.69)   $     (0.33)
                                                                 ===========    ===========

Pro forma weighted-average shares outstanding:
    Basic and Diluted                                              3,500,487      3,308,706
                                                                 ===========    ===========


- ----------
(1)   Pro forma net loss per share gives effect to conversion of all mandatorily
      convertible preferred stock (including accrued preferred dividends) into
      common stock.


                                       4


Balance Sheet Data

                                                      December 31, 2002
                                                  Actual          Pro Forma (1)
                                               -----------        -----------
Cash and cash equivalents                      $   240,412        $   240,412
Working capital (deficiency)                    (2,190,242)        (2,190,242)
Total assets                                     1,279,583          1,279,583
Short-term debt, net                             1,610,000          1,610,000
Redeemable preferred stock                       5,885,550                 --
Stockholders'  equity (deficit)                $(7,995,193)       $(2,109,643)

- ----------
(1)   Gives effect to the conversion of all mandatorily convertible preferred
      stock (including accrued preferred dividends) into common stock upon
      completion of this initial public offering.



                                       5


                                  RISK FACTORS

      Investing in our common stock involves a high degree of risk. You should
carefully consider the following risk factors and all other information
contained in this prospectus before purchasing our common stock. The risks and
uncertainties described below are those that we currently believe may materially
affect our company. Additional risks and uncertainties may also impair our
business operations. If the following risks actually occur, our business,
financial condition and results of operations could be seriously harmed, the
trading price of our common stock could decline and you could lose all or part
of your investment.

                          Risks Related to Our Company

We have a history of operating losses and a significant accumulated deficit, and
we may not achieve or maintain profitability in the future.

      We have not been profitable since our inception in 1997. As of December
31, 2002, we had an accumulated deficit of approximately $15.0 million primarily
as a result of our research and development expenses. We expect to continue to
incur additional losses for the foreseeable future as a result of a high level
of operating expenses, significant up-front expenditures, production and
marketing activities and very limited revenue from the sale of our products. We
may never realize significant revenues from the sale of our products or be
profitable. Our independent auditors have included an explanatory paragraph in
the financial statements attached to this prospectus expressing doubt as to our
ability to continue as a going concern. Factors that will influence the timing
and amount of our profitability include: (1) regulatory approval or clearance of
our products; (2) market acceptance of our products; (3) our ability to
effectively and efficiently manufacture, market and distribute our products; and
(4) our ability to sell our products at competitive prices which exceed our per
unit costs.

We cannot sell our products until we obtain the requisite regulatory approvals
and clearances in the countries in which we intend to sell our products. If
there is a significant delay in receiving such approvals, then we may not be
able to get our products to market and generate revenues.

      Our business strategy depends in part on our ability to get our products
into the market as quickly as possible. We currently plan to launch our western
European sales efforts for the OLpur(TM) MD190 during the spring of 2003 and to
launch our United States sales efforts for the OLpur(TM) MD190 and the OLpur(TM)
H(2)H(TM) by the end of 2003. We cannot sell our products in western Europe
until we obtain the Conformite Europeenne, or CE, mark, which demonstrates
compliance with the relevant European Union requirements. We have not yet
obtained the CE mark for any of our products. Similarly, we cannot sell our
products in the United States until we receive U.S. Federal Drug Administration,
or FDA, clearance. Until we complete the requisite U.S. human clinical trials
and submit premarket notification to the FDA pursuant to section 510(k) of the
Federal Food, Drug, and Cosmetic Act, or the FDC Act, we will not be eligible
for FDA approval for any of our products.

      In addition to the premarket notification required pursuant to section
510(k) of the FDC Act, the FDA could require us to obtain premarket approval of
our products under Section 515 of the FDC Act, either because of legislative or
regulatory changes or because the FDA does not agree with our determination that
we are eligible to use the Section 510(k) premarket notification process. The
Section 515 premarket approval process is a significantly more costly, lengthy
and uncertain approval process and could delay our products coming to market by
several years. See "Governmental Regulation - Food and Drug Administration" for
additional details about the approval process.

      The clearance and/or approval process in the European Union and the United
States can be lengthy and uncertain and each requires substantial commitments of
our financial resources and our management's time and effort. We may not be able
to obtain regulatory approval in the European Union or the United States in a
timely manner or at all. Even if we do obtain regulatory approval for any of our
products, approval may be only for limited uses with specific classes of
patients, processes or other devices. Our failure to obtain, or delays in
obtaining, the necessary regulatory clearance and/or approvals in the European
Union and the United States would prevent us from selling our products in these
regions. If we cannot sell our products in these regions, or if we are delayed
in selling while awaiting the necessary clearance and/or approvals, we will not
be able to generate revenues from our products.

      If we are successful in our initial marketing efforts in western Europe
and the United States, then we plan to market our products in several countries
outside of western Europe and the United States, including Japan, Korea, Canada
and Mexico. Requirements pertaining to the sale of medical devices vary widely
from country to country. It may be very expensive and difficult for us to meet
the requirements for the sale of our products in many of these countries. As a
result, we may not be able to obtain the required approvals in a timely manner,
if at all. If we cannot sell our products outside of western Europe and the
United States, then the size of our potential market could be reduced, which
would reduce our sales and revenues.


                                       6


Any modifications we make to our products may require additional approvals or
clearances before the modified product may be marketed and significant delays in
marketing such products would negatively impact our revenues.

      Changes to devices cleared for marketing under section 510(k) of the FDC
Act that could significantly affect safety and effectiveness will require
clearance of a notification pursuant to section 510(k) and we may need to submit
clinical and manufacturing comparability data to obtain such approval or
clearance. We would be prohibited from marketing the modified device until we
received FDA clearance or approval. We cannot guarantee that the FDA would
timely, if at all, clear or approve any modified product for which section
510(k) is applicable. Failure to obtain timely clearance or approval for changes
to marketed products would impair our ability to sell such products and generate
revenues.

We cannot assure you that our products will be safe or effective and we are
required under the FDC Act to report any product-related deaths or serious
injuries or product malfunctions that could result in deaths or serious injuries
and such reports could trigger other events that could limit our ability to
generate revenues or be profitable.

      We cannot assure you that our products will be safe or effective. Under
the FDC Act, we are required to submit medical device reports, or MDRs, to the
FDA to report device-related deaths, serious injuries and product malfunctions
that could result in death or serious injury if they were to recur. Depending on
their significance, MDRs could trigger other events that could limit our ability
to generate revenues or be profitable, such as the following:

      o     information contained in the MDRs could trigger FDA regulatory
            actions such as inspections, recalls and patient/physician
            notifications;

      o     since the reports are publicly available, MDRs could become the
            basis for private lawsuits, including class actions; and

      o     if we fail to submit a required MDR to the FDA, the FDA could take
            enforcement action against us.

If any of these events occur, we could incur significant losses and it could
become more difficult for us to gain market acceptance of our products. If we
incur significant losses or if we do not achieve market acceptance for our
products, we may not be able to generate revenues or achieve or maintain
profitability.

If we violate any provisions of the FDC Act or any other statutes or
regulations, we could be subject to enforcement actions by the FDA or other
governmental agencies.

      We face a significant compliance burden under the FDC Act and other
applicable statutes and regulations which govern the testing, labeling, storage,
record keeping, distribution, sale, marketing, advertising and promotion of our
products. If we violate the FDC Act or other regulatory requirements at any time
during or after the product development and/or approval process, we could be
subject to enforcement actions by the FDA or other agencies, including (1)
fines; (2) injunctions; (3) civil penalties; (4) recalls or seizures of our
products; (5) total or partial suspension of the production of our products; (6)
withdrawal of existing approvals or premarket clearances of our products; (7)
refusal to approve or clear new applications or notices relating to our
products; (8) recommendations by the FDA that we not be allowed to enter into
government contracts and (9) criminal prosecution, any of which could have a
material adverse effect on our business, financial condition and results of
operations.

Our business strategy depends on our ability to get our products into the market
as quickly as possible. Significant additional governmental regulation could
subject us to unanticipated delays which would delay our ability to generate
revenues and be profitable.

      Our business strategy depends in part on our ability to get our products
into the market as quickly as possible and we are particularly vulnerable to
delays and impediments. Additional laws and regulations that are applicable to
our business may be enacted or promulgated, and the interpretation, application
or enforcement of the existing laws and regulations may change. We cannot
predict the nature of any future laws, regulations, interpretations,
applications or enforcements or the effect any of these would have on our
business. Any future laws, regulations, interpretations, applications or
enforcements could delay or prevent regulatory approval or clearance of our
products and our ability to market our products. Moreover, changes that result
in our failure to comply with the requirements of applicable laws and
regulations could result in the types of enforcement actions by the FDA and/or
other agencies as described above, all of which could impair our ability to have
manufactured and to sell the affected products.

      Our products will be new to the market and we do not yet have an
established market or customer base for our products. As such, we cannot
withstand significant delays in getting our products to market. Our major
competitors are significantly better capitalized than we are and can more easily
withstand delays resulting from significant additional governmental regulation.
If we are not able to market our products within the anticipated time frames at
competitive prices that exceed our per unit costs, then we may not be
profitable.


                                       7


Protecting our intellectual property in our technology through patents may be
costly and ineffective and if we are not able to protect our intellectual
property, we may not be able to compete effectively and we may not be
profitable.

      Our future success depends in part on our ability to protect the
intellectual property for our technology through patents. We will only be able
to protect our products and methods from unauthorized use by third parties to
the extent that our products and methods are covered by valid and enforceable
patents or are effectively maintained as trade secrets. Assuming all of the US
Patent and Trademark office fees are paid, our granted U.S. patents will remain
in force until 2019 and cover the "Method and Apparatus for Efficient
Hemodiafiltration," the "Two Stage Diafiltration Method and Apparatus," the
"Non-Isosmotic Diafiltration System" and the "Dual Stage Hemodiafiltration
Cartridge." Our U.S. patent, for the "Method and Apparatus for Efficient
Hemodiafiltration," and the pending patent application, for the "Dual Stage
Filtration Cartridge," have claims that cover the OLpur(TM) MD190 product and
the method of hemodiafiltration employed in the operation of the product.
Although there are pending applications with claims to the present embodiments
of the OLpur(TM) H(2)H(TM) and the OLpur(TM) NS2000 products, these products are
still in the design stage and we cannot determine if the applications (or the
patents that may issue on them) will also cover the ultimate commercial
embodiment of these products. See "Business - Intellectual Property - Patents"
for additional details about our patents.

      The protection provided by our patents, and patent applications if issued,
may not be broad enough to prevent competitors from introducing similar products
into the market. Our patents, if challenged or if we attempt to enforce them,
may not be upheld by the courts of any jurisdiction. Numerous publications may
have been disclosed by, and numerous patents may have been issued to, our
competitors and others relating to methods of dialysis of which we are not aware
and additional patents relating to methods of dialysis may be issued to our
competitors and others in the future. If any of those publications or patents
conflict with our patent rights, or cover our products, then any or all of our
patent applications could be rejected and any or all of our granted patents
could be invalidated, either of which could materially adversely affect our
competitive position.

      Litigation and other proceedings relating to patent matters, whether
initiated by us or a third party, can be expensive and time consuming,
regardless of whether the outcome is favorable to us, and may require the
diversion of substantial financial, managerial and other resources. An adverse
outcome could subject us to significant liabilities to third parties or require
us to cease any related development product sales or commercialization
activities. In addition, if patents that contain dominating or conflicting
claims have been or are subsequently issued to others and the claims of these
patents are ultimately determined to be valid, we may be required to obtain
licenses under patents of others in order to develop, manufacture use, import
and/or sell our products. We may not be able to obtain licenses under any of
these patents on terms acceptable to us, if at all. If we do not obtain these
licenses, we could encounter delays in, or be prevented entirely from using,
importing, developing, manufacturing, offering or selling any products or
practicing any methods, or delivering any services requiring such licenses.

      If we file patent applications or obtain patents in foreign countries, we
will be subject to laws and procedures that differ from those in the United
States, which could lead to some uncertainty about the level and extent of our
patent protection. Moreover, patent protection in foreign countries may be
different from patent protection under U.S. laws and may not be as favorable to
us.

If we are not able to protect our trade secrets through enforcement of our
confidentiality and non-competition agreements, then we may not be able to
compete effectively and we may not be profitable.

      We attempt to protect our trade secrets, including the processes,
concepts, ideas and documentation associated with our technologies, through the
use of confidentiality agreements and non-competition agreements with our
current employees and with other parties to whom we have divulged such trade
secrets. If the employees or other parties breach our confidentiality agreements
and non-competition agreements or if these agreements are not sufficient to
protect our technology or are found to be unenforceable, our competitors could
acquire and use information that we consider to be our trade secrets and we may
not be able to compete effectively. Most of our competitors have substantially
greater financial, marketing, technical and manufacturing resources than we have
and we may not be profitable if our competitors are also able to take advantage
of our trade secrets.

If our trademarks and trade names are not adequately protected, then we may not
be able to build brand loyalty and our sales and revenues may suffer.

      Our registered or unregistered trademarks or trade names may be
challenged, canceled, infringed, circumvented or declared generic or determined
to be infringing on other marks. See "Business--Intellectual Property." We may
not be able to protect our rights to these trademarks and trade names, which we
need to build brand loyalty. Over the long term, if we are unable to establish a
brand based on our trademarks and trade names, we may not be able to compete
effectively.


                                       8


If we are not able to successfully commercialize our products, then we will not
be profitable.

      Other than the units of our OLpur(TM) MD190 manufactured for our clinical
trial and a small number of units for commercialization scale-up, we have
produced only prototype units of our OLpur(TM) MD190 and OLpur(TM) H(2)H(TM) and
the OLpur(TM) NS2000 system. In order to commercialize our products, we need to
be able to produce them in a cost-effective way on a large scale to meet
commercial demand, while maintaining extremely high standards for quality and
reliability. If we fail to successfully commercialize our products, then we will
not be profitable.

      We expect to rely on a limited number of independent manufacturers to
produce the OLpur(TM) MD190 and our other products for us. Our future
manufacturers' systems and procedures may not be adequate to support our
operations and may not be able to achieve the rapid execution necessary to
exploit the market for our products. Our manufacturers could experience
manufacturing and control problems as they begin to scale-up our future
manufacturing operations and we may not be able to scale-up manufacturing in a
timely manner or at a commercially reasonable cost to enable production in
sufficient quantities. If we experience any of these problems with respect to
our manufacturers' initial or future scale-ups of manufacturing operations, then
we may not be able to have our products manufactured and delivered in a timely
manner.

      As of the date of this prospectus, we have not entered into any formal
agreements with any manufacturers to manufacture our products and components. We
cannot assure you that we will be able to enter into agreements with
manufacturers on terms acceptable to us in a timely manner, if at all. If we do
not enter into agreements for the manufacture of our products and components, we
could encounter delays in, or be prevented from, manufacturing and selling any
or all of our products and we will not be profitable.

We will not control the independent manufacturers of our products, which may
affect our ability to deliver our products in a timely manner. If we are not
able to ensure the timely delivery of our products, then we will not be
profitable.

      Independent manufacturers of medical devices will manufacture all of our
products and components. As with any independent contractor, these manufacturers
will not be employed or otherwise controlled by us and will be generally free to
conduct their business at their own discretion. For us to be profitable, our
products must be manufactured on a timely basis in commercial quantities at
costs acceptable to us. If one or more of our independent manufacturers fails to
deliver our products in a timely manner, then we may not be able to find a
substitute manufacturer in the time required. If we are not able to find a
substitute manufacturer to effectively and efficiently manufacture our products,
then we will not be profitable.

If we are not able to maintain sufficient quality controls, then the approval or
clearance of our products by the European Union, the FDA or other relevant
authorities could be delayed or denied and we will not be profitable.

      Approval or clearance of our products could be delayed by the European
Union, the FDA and the relevant authorities of other countries if our
manufacturing facilities do not comply with their respective manufacturing
requirements. The European Union imposes requirements on quality control systems
of manufacturers, which are inspected and certified on a periodic basis and may
be subject to additional unannounced inspections. Failure by our manufacturers
to comply with the European Union requirements could prevent us from obtaining
the CE mark and from marketing our products in western Europe. The FDA also
imposes requirements through quality system requirements, or QSR, regulations,
which include requirements for good manufacturing practices, or GMP. Failure by
our manufacturers to comply with these requirements could prevent us from
obtaining FDA approval of our products and from marketing our products in the
United States. Although some of the manufacturing facilities and processes that
we expect to use to manufacture our OLpur(TM) MD190 have been inspected by TUV
Product Service (Munich), a worldwide testing and certification agency that
performs conformity assessments to European Union requirements for medical
devices, they have not been inspected by the FDA. Similarly, although the FDA
has inspected some of the facilities and processes that we expect to use to
manufacture our OLpur(TM) H(2)H(TM) and OLpur(TM) NS2000, they have not been
inspected by any TUV organization. We cannot assure you that any of the
facilities or processes we use will comply or continue to comply with their
respective requirements on a timely basis or at all, which could delay or
prevent our obtaining the approvals we need to market our products in Europe and
the United States.

      Our ability to become profitable depends upon our ability to get our
products to market as quickly as possible and, once we gain market acceptance,
to effectively and efficiently manufacture, market and distribute our products.
If our products are not approved or if there is a significant delay in our
products being approved by the relevant authorities, then we will not be
profitable.

      Even if we do obtain approval to market our products in Europe, the United
States and other countries, manufacturers of our products must continue to
comply or ensure compliance with the relevant manufacturing requirements.
Although we cannot control the manufacturers of our products, we may need to
expend time, resources and effort in product manufacturing and quality control
to assist with their continued compliance with these requirements. If violations
of applicable requirements are


                                       9


noted during periodic inspections of the manufacturing facilities of our
manufacturers, we may not be able to continue to market the products
manufactured in such facilities and our revenues may be materially adversely
affected.

The loss or interruption of services of any of our manufacturers could slow or
stop production of our products.

      Because we are likely to rely on no more than two contract manufacturers
to manufacture each of our products and major components of our products, a stop
or significant interruption in the supply of our products or major components by
a single manufacturer, for any reason, could have a material adverse effect on
us. We expect most of our contract manufacturers will enter into contracts with
us to manufacture our products and major components and that these contracts
will be terminable by the contractors or us at any time under certain
circumstances. We have not made alternative arrangements for the manufacture of
our products or major components and we cannot assure you that acceptable
alternative arrangements could be made on a timely basis, or at all, if one or
more of our manufacturers failed to manufacture our products or major components
in accordance with the terms of our arrangements. Our inability to obtain
acceptable alternative arrangements for the manufacture of our products or major
components of our products would slow down or halt the production and sale of
our products and reduce our cash flow.

Once our products are commercialized, we may face significant challenges in
obtaining market acceptance of our products, which could adversely affect our
potential sales and revenues.

      Acceptance of our products in the marketplace by both potential users,
including ESRD patients, and potential purchasers, including nephrologists,
dialysis clinics and other health care providers, is uncertain, and our failure
to achieve sufficient market acceptance will significantly limit our ability to
generate revenue and be profitable. Market acceptance will require substantial
marketing efforts and the expenditure of significant funds by us to inform
dialysis patients and nephrologists, dialysis clinics and other health care
providers of the benefits of using our products. We may encounter significant
clinical and market resistance to our products and our products may never
achieve market acceptance. Factors that may affect our ability to achieve
acceptance of our products in the market place include whether:

      o     our products will be safe for use;

      o     our products will be effective;

      o     our products will be cost-effective;

      o     we will be able to demonstrate product safety, efficacy and
            cost-effectiveness;

      o     there are unexpected side effects, complications or other safety
            issues associated with our products; and

      o     reimbursement for the cost of our products is available at
            reasonable rates, if at all.

If Hemodiafiltration, or HDF, does not become the preferred therapy for ESRD,
then the market for our products may be limited and we may not be profitable.

      A significant portion of our success is dependent on the acceptance and
implementation of HDF as the preferred therapy for ESRD. There are many
treatment options currently available and others may be developed. HDF may not
become the preferred therapy for ESRD. If it does not, the market for our
products will be limited and we may not be able to sell a sufficient quantity of
our products to be profitable.

If we cannot develop adequate distribution, customer service and technical
support networks, then we may not be able to market and distribute our products
effectively and we may not be profitable.

      Our strategy requires us to distribute our products and provide a
significant amount of customer service and maintenance and other technical
service. To provide these services, we will be required to develop networks of
employees or independent contractors in each of the areas in which we intend to
operate. We cannot assure you we will be able to organize and manage these
networks on a cost-effective basis, if at all. If we fail to establish these
networks, then it may be difficult for us to gain market acceptance of our
products. If we fail to gain market acceptance, then we will not be profitable.


                                       10


We may face significant risks associated with international operations, many of
which could have a material adverse effect on our business, financial condition
and results of operations.

      We expect to manufacture and to market our products in western Europe and
elsewhere outside of the United States. We expect that our revenues from western
Europe will initially account for a significant portion of our revenues. Our
international operations are subject to a number of risks, including the
following:

      o     fluctuations in exchange rates of the United States dollar could
            adversely affect our results of operations;

      o     we may face difficulties in enforcing and collecting accounts
            receivable under some countries' legal systems;

      o     local regulations may restrict our ability to sell our products,
            have our products manufactured or conduct other operations;

      o     political instability could disrupt our operations;

      o     some governments and customers may have longer payment cycles, with
            resulting adverse effects on our cash flow; and

      o     some countries could impose additional taxes or restrict the import
            of our products.

      Any one or more of these factors could increase our costs, reduce our
revenues, or disrupt our operations, which could have a material adverse effect
on our business, financial condition and results of operations.

If we are not able to obtain adequate insurance or other protection against
product liability risks associated with the production, marketing and sale of
our products, then we could face liabilities that would materially adversely
affect our financial condition and our ability to be profitable.

      The production, marketing and sale of kidney dialysis products have an
inherent risk of liability in the event of product failure or claim of harm
caused by product operation. Although we intend to acquire product liability
insurance upon commercialization of each of our products, we may not be able to
obtain this insurance on acceptable terms or at all. Because we may not be able
to obtain insurance that provides us with adequate protection against all
potential product liability claims, a successful claim in excess of our
insurance coverage could materially adversely affect our financial condition.
Moreover, any claim against us could generate negative publicity, which could
decrease the demand for our products, our ability to generate revenues and our
profitability.

      Some of the agreements that we may enter into with manufacturers of our
products and components of our products may require us (1) to obtain product
liability insurance or (2) indemnify manufacturers against liabilities resulting
from the sale of our products. If we are not able to obtain and maintain
adequate product liability insurance, we will be in breach of these agreements,
which could materially adversely affect our ability to produce our products. If
we are able to obtain and maintain product liability insurance and a successful
claim in excess of our insurance coverage is made, we may have to indemnify some
or all of our manufacturers for their losses.

If we are unable to keep our key management and scientific personnel, then we
are likely to face significant delays at a critical time in our corporate
development and our business is likely to be damaged.

      Our success depends upon the skills, experience and efforts of our
management and other key personnel, including our chief executive officer,
certain members of our scientific staff and our marketing executive. As a
relatively new company, much of our corporate, scientific and technical
knowledge is concentrated in the hands of these few individuals. We do not
maintain key-man life insurance on any of our management or other key personnel.
The loss of the services of one or more of our present management or other key
personnel could significantly delay the development and/or launch of our
products as there could be a learning curve of several months or more for any
replacement personnel. Furthermore, competition for the type of highly skilled
individuals we require is intense and we may not be able to attract and retain
new employees of the caliber needed to achieve our objectives. Failure to
replace key personnel could have a material adverse effect on our business,
financial condition and operations.

Our certificate of incorporation limits liability of our directors, which could
discourage you or other stockholders from bringing suits against our directors
in circumstances where you think they might otherwise be warranted.

      Our certificate of incorporation provides, with specific exceptions, that
our directors are not personally liable to us or our stockholders for monetary
damages for any action or failure to take any action. In addition, we have
agreed, and our certificate of incorporation and bylaws provide for, mandatory
indemnification of directors and officers to the fullest extent permitted by
Delaware law. These provisions may discourage stockholders from bringing suit
against a director for breach of duty and may reduce the likelihood of
derivative litigation brought by stockholders on our behalf against any of our
directors.


                                       11


                          Risks Related to Our Industry

We expect to face significant competition from existing suppliers of renal
replacement treatment devices, supplies and services. If we are not able to
compete with them effectively, then we may not be profitable.

      We expect to compete in the kidney dialysis market with existing suppliers
of hemodialysis and peritoneal dialysis devices, supplies and services. Our
competitors include Fresenius Medical Care AG, The Gambro Company and Baxter
International Inc., currently three of the primary machine manufacturers in
hemodialysis, as well as B. Braun Biotech International GmbH, Nipro Medical
Corporation, Asahi Kasei Corporation and other smaller machine manufacturers in
hemodialysis. Fresenius and Gambro also manufacture hemodiafiltration machines.
These companies and most of our other competitors have longer operating
histories and substantially greater financial, marketing, technical,
manufacturing and research and development resources and experience than we
have. Our competitors could use these resources and experiences to develop
products that are more effective or less costly than any or all of our products
or that could render any or all of our products obsolete. Our competitors could
also use their economic strength to influence the market to continue to buy
their existing products.

      We do not have an established customer base and may encounter a high
degree of competition in developing one. Our potential customers are a limited
number of nephrologists, national, regional and local dialysis clinics and other
healthcare providers. The number of our potential customers may be further
limited to the extent any exclusive relationships are entered into between our
potential customers and our competitors. We cannot assure you that we will be
successful in marketing our products to these potential customers. If we are not
able to develop competitive products and take and hold sufficient market share
from our competitors, we will not be profitable.

Because some of our competitors own or could acquire dialysis clinics throughout
the United States, Europe and other regions of the world, we may not be able to
successfully market our products to the dialysis clinics under their ownership.
If our potential market is significantly reduced, then we may not be profitable.

      Some of our competitors, including Fresenius and Gambro, manufacture their
own products and own dialysis clinics in the United States, Europe and other
regions of the world. Because these competitors have historically tended to use
their own products, we may not be able to successfully market our products to
the dialysis clinics under their ownership. According to the Merrill Report,
approximately 95% of the products then used by dialysis clinics owned by
Fresenius were products of Fresenius and approximately 40% of the products then
used by dialysis clinics owned by Gambro were products of Gambro. Based on the
same report, and by our calculations, we estimate that as of September 2001: (1)
Fresenius treated in its own dialysis clinics approximately 24.8% of the
dialysis patients in the United States, 4.6% of the dialysis patients in Europe
and 8.5% of the dialysis patients worldwide; and (2) Gambro treated in its own
dialysis clinics approximately 13.5% of the dialysis patients in the United
States, 2.3% of the dialysis patients in Europe and 4.5% of the dialysis
patients worldwide. If our competitors continue to grow their networks of
dialysis clinics and if we cannot successfully market our products to dialysis
clinics owned by these competitors or any other competitors, then our revenues
could be adversely affected.

If the size of the market for our products is significantly reduced due to
pharmacological or technological advances in preventative and alternative
treatments for ESRD, then we may not be profitable.

      Pharmacological or technological advances in preventative or alternative
treatments for ESRD could significantly reduce the number of ESRD patients
needing our products. These pharmacological or technological advances may
include: (1) the development of new medications, or improvements to existing
medications, which help to delay the onset or prevent the progression of ESRD in
high-risk patients (such as those with diabetes and hypertension); (2) the
development of new medications, or improvements in existing medications, which
reduce the incidence of kidney transplant rejection; and (3) developments in the
use of kidneys obtained from genetically-engineered animals as a source of
transplants. If these or any other pharmacological or technological advances
reduce the number of patients needing treatment for ESRD and the size of the
market for our products, we may not be profitable.

If the number of ESRD patients needing ongoing treatment for ESRD does not
increase at the rate we estimate, then our potential market may be smaller than
we anticipate and we may not be profitable.

      According to the Lysaght Article, as of mid-year 2001, the number of
dialysis patients worldwide was estimated to be over 1.1 million and the size of
this population has been expanding at rate of approximately 7% per year.
According to the same article, the number of dialysis patients is expected to be
over two million by 2010, assuming current trends in ESRD prevalence continue.
If the number of ESRD patients needing ongoing treatment for ESRD does not
increase at that rate, the size of the market for our products will not increase
at the rate we estimate and, therefore, our revenues could be adversely
affected.


                                       12


If government and other third party reimbursement programs discontinue their
coverage of ESRD treatment or reduce reimbursement rates for ESRD products, then
we may need to reduce the estimated prices of our products and we may not be
profitable.

      Providers of renal replacement therapy are often reimbursed by government
programs, such as Medicare or Medicaid in the U.S., or other third-party
reimbursement programs, such as private medical care plans and insurers. We
believe that the amount of reimbursement for renal replacement therapy under
these programs has a significant impact on the decisions of nephrologists,
dialysis clinics and other health care providers regarding treatment methods and
products. Accordingly, changes in the extent of coverage for renal replacement
therapy or a reduction in the reimbursement rates under any or all of these
programs may cause a decline in recommendations or purchases of our products,
which would materially adversely affect the market for our products and reduce
our revenues.

As the number of managed health care plans increases in the United States,
amounts paid for our products by non-governmental programs may decrease and we
may not generate sufficient revenues to be profitable.

      We expect to obtain a portion of our revenues from reimbursement provided
by non-governmental programs in the United States. Although non-governmental
programs generally pay higher reimbursement rates than governmental programs, of
the non-governmental programs, managed care plans generally pay lower
reimbursement rates than insurance plans. Reliance on managed care plans for
dialysis treatment may increase if future changes to the Medicare program
require non-governmental programs to assume a greater percentage of the total
cost of care given to dialysis patients over the term of their illness, or if
managed care plans otherwise significantly increase their enrollment of these
patients. If the reliance on managed care plans for dialysis treatment
increases, more patients join managed care plans or managed care plans reduce
reimbursements rates, we may need to reduce estimated prices of our products and
may not be profitable.

If the per-treatment costs for dialysis clinics using our products are higher
than the costs of clinics providing hemodialysis treatment, then we may not
achieve market acceptance of our products in the United States and we may not be
profitable.

      If the cost of our products results in an increased cost to the dialysis
clinic over hemodialysis therapies and such cost is not separately reimbursable
by governmental programs or private medical care plans and insurers outside of
the per-treatment fee, then we will not gain market acceptance for our products
in the United States unless HDF therapy becomes the standard treatment method
for ESRD. If we do not gain market acceptance for our products in the United
States, then the size of our market and anticipated revenue will be reduced and
we may not be profitable.

Proposals to modify the health care system in the United States or other
countries could affect the pricing of our products. If we cannot sell our
products at the prices we plan to, then we may not be profitable.

      A substantial portion of the cost of treatment for ESRD in the United
States is currently reimbursed by the Medicare program at prescribed rates.
Proposals to modify the current health care system in the United States to
improve access to health care and control its costs are continually being
considered by the federal and state governments. We anticipate that the U.S.
Congress and state legislatures will continue to review and assess alternative
health care reform proposals. We cannot predict whether these reform proposals
will be adopted, when they may be adopted or what impact they may have on us if
they are adopted. Any spending decreases or other significant changes in the
Medicare program could affect the pricing of our products. As we are not yet
established in our business and it will take some time for us to begin to recoup
our research and development costs, our profit margins are likely initially to
be lower than those of our competitors and we may be more vulnerable to small
decreases in price than many of our competitors. If we are not able to generate
sufficient returns, then we will not be profitable.

      Health administration authorities in countries other than the United
States may not provide reimbursement for our products at rates sufficient for us
to achieve profitability, or at all. Like the United States, these countries,
especially those in western Europe, have considered health care reform proposals
and could materially alter their government-sponsored health care programs by
reducing reimbursement rates for dialysis products. Any reduction in
reimbursement rates under foreign health care programs could negatively affect
the pricing of our products and we may not be profitable.


                                       13


                         Risks Related to this Offering

We may invest or spend the proceeds of this offering in ways with which you do
not agree and in ways that may not yield a favorable return.

      Our management will have broad discretion over the use of the net proceeds
from this offering. Stockholders may not deem such uses desirable. Our use of
the proceeds from this offering may vary substantially from our currently
planned uses and investors in this offering will be relying on the judgment of
our management with respect to the use of proceeds of this offering. We cannot
assure you that we will apply such proceeds effectively or that we will invest
such proceeds in a manner that will yield a favorable return or any return at
all.

Several provisions of the Delaware General Corporation Law, our amended and
restated certificate of incorporation and our bylaws could discourage, delay or
prevent a merger or acquisition, which could adversely affect the market price
of our common stock.

      Several provisions of the Delaware General Corporation Law, our amended
and restated certificate of incorporation and our bylaws could discourage, delay
or prevent a merger or acquisition that stockholders may consider favorable.
These provisions include:

      o     authorizing our board of directors to issue "blank check" preferred
            stock without stockholder approval;

      o     providing for a classified board of directors with staggered,
            three-year terms;

      o     prohibiting us from engaging in a "business combination" with an
            "interested stockholder" for a period of three years after the date
            of the transaction in which the person became an interested
            stockholder unless certain provisions are met;

      o     prohibiting cumulative voting in the election of directors;

      o     prohibiting stockholder action by written consent unless the written
            consent is signed by all stockholders entitled to vote on the
            action;

      o     limiting the persons who may call special meetings of stockholders;
            and

      o     establishing advance notice requirements for nominations for
            election to our board of directors or for proposing matters that can
            be acted on by stockholders at stockholder meetings.

As a relatively new company with little or no name recognition and with several
risks and uncertainties that could impair our business operations, we are not
likely to generate widespread interest in our common stock following this
offering. Without widespread interest in our common stock, our common stock
price may be highly volatile and your investment in our common stock could
decline in value.

      Prior to this offering, there has been no public market for our common
stock. Unlike many companies with publicly traded securities, we have little or
no name recognition outside the nephrology community. We are a relatively new
company and very few investors are familiar with either our company or our
products. As we will not be marketing our products directly to the public, it
may be difficult for us to generate the kind of interest in our stock that other
companies experience after an initial public offering. After this offering, an
active trading market in our common stock might not develop, or if it does
develop, might not continue.

      Additionally, the market price of our common stock may fluctuate
significantly in response to many factors, many of which are beyond our control.
Risks and uncertainties described elsewhere in this "Risk Factors" section could
impair our business operations or otherwise cause our operating results to be
below expectations of investors and market analyst, which could adversely affect
the market price of our common stock. As a result, investors purchasing in this
offering may not be able to resell their shares at or above the initial public
offering price and could lose all of their investment.

      In the past, following periods of volatility in the market price of a
particular company's securities, securities class action litigation has often
been brought against the company. We may become involved in this type of
litigation in the future. Litigation of this type could be extremely expensive
and divert management's attention and resources from running our company. If
management's attention and resources are diverted, then we may not be
profitable.


                                       14


Because our capital requirements have been and will continue to be significant,
we may need funds in addition to the net proceeds of this offering or we will
not be able to continue to operate our business. If our business fails, then you
could lose your entire investment.

      Our capital requirements have been and will continue to be significant. To
date, we have been dependent primarily on the net proceeds of private placements
of our equity and debt securities, aggregating approximately $11.7 million. We
are dependent upon the net proceeds of this offering to fund our marketing and
sales efforts, clinical trials, regulatory approvals, research and development
as well as our other working capital requirements. We currently have no
committed sources of, or other arrangements with respect to, additional
financing. We cannot assure you that our existing capital resources, together
with the net proceeds from this offering and future operating cash flows, will
be sufficient to fund our future operations. Our capital requirements will
depend on numerous factors, including:

      o     the time and cost involved in obtaining regulatory approval for our
            products;

      o     the cost involved in protecting our proprietary rights;

      o     the time and cost involved in manufacturing scale-up and in
            establishing marketing acceptance;

      o     the time and cost involved in providing training and technical
            support networks; and

      o     the effectiveness of other commercialization activities.

      If we require additional capital beyond the cash generated from our
operations and the proceeds of this offering, we would need to seek other forms
of financing, through the sale of equity securities or otherwise, to achieve our
business objectives. We cannot assure you that we will be able to obtain
alternative financing on acceptable terms or at all. Our failure to obtain
financing when needed could have a material adverse effect on us. Any additional
equity financing could substantially dilute your equity interests in our company
and any debt financing could impose significant financial and operational
restrictions on us.

Our principal stockholders, directors and executive officers prior to the
offering will still control a significant portion of our stock after the
offering and, if they choose to vote together, could have sufficient voting
power to control the vote on substantially all corporate matters.

      Our principal stockholders, directors and executive officers prior to the
offering will own, beneficially and/or of record, approximately 57.7% of our
outstanding common stock after this offering (without giving effect to the
exercise of the underwriters' over-allotment option). Our principal
stockholders, directors and executive officers will own, beneficially and/or of
record, approximately 34.7% of our outstanding common stock after this offering.
Should they act as a group, they will have the power to elect all of our
directors and to control the vote on substantially all other corporate matters
without the approval of other stockholders, including those stockholders who
purchase stock in this offering. This concentration in voting power may result
in the ability of those stockholders to delay or prevent another party from
taking control of our company.

Future sales of our common stock could cause the market price of our common
stock to decline.

      The market price of our common stock could decline due to sales of a large
number of shares in the market after this offering, including sales of shares by
our large stockholders, or the perception that such sales could occur. These
sales could also make it more difficult or impossible for us to sell equity
securities in the future at a time and price that we deem appropriate to raise
funds through future offerings of common stock.

      All of our existing security holders (other than Lancer Offshore, Inc.)
will be subject to lock-up agreements which prohibit the sale of any of their
shares of our common stock in the public market until one year from the
effective date of this prospectus and, thereafter, on a cumulative basis for
each holder, of more than 1/3 of our common stock held by such holder prior to
15 months from the effective date of this prospectus or more than 2/3 of our
common stock held by such holder prior to 18 months from the effective date of
this prospectus. Lancer Offshore Inc. will be subject to a lock-up agreement
that prohibits the sale of any of its shares in the public market until 180 days
after the effective date. We have entered into registration rights agreements
with many of our existing stockholders that entitle them to have an aggregate of
2,305,755 shares registered for sale in the public market. All of those shares
could be sold in the public market after one year subject to the limitations of
Rule 144 under the Securities Act.

You will incur immediate and substantial dilution.

      The assumed initial public offering price per share of our common stock is
substantially higher than the net tangible book value per share of our
outstanding common stock. As a result, investors purchasing common stock in this
offering will incur immediate and substantial dilution in the net tangible book
value of their common stock of $4.45 per share based on the


                                       15


assumed initial public offering price of $6.00 per share. To the extent we raise
additional capital by issuing equity securities in the future, you and our other
stockholders may experience substantial dilution and future investors may be
granted rights superior to those of our current stockholders.

              CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

      This prospectus contains forward-looking statements. These statements are
not historical facts, but rather are based on our current expectations,
estimates and projections about our industry, our beliefs and assumptions. Words
including "may," "could," "would," "anticipates," "expects," "intends," "plans,"
"projects," "believes," "seeks," "estimates" and similar expressions are
intended to identify forward-looking statements. These statements are not
guarantees of future performance and are subject to certain risks, uncertainties
and other factors, some of which remain beyond our control, are difficult to
predict and could cause actual results to differ materially from those expressed
or forecasted in the forward-looking statements. These risks and uncertainties
are described in "Risk Factors" and elsewhere in this prospectus. We caution you
not to place undue reliance on these forward-looking statements, which reflect
our management's view only as of the date of this prospectus. We are not
obligated to update these statements or publicly release the result of any
revisions to them to reflect events or circumstances after the date of this
prospectus or to reflect the occurrence of unanticipated events.


                                       16


                    IMPORTANT ASSUMPTIONS IN THIS PROSPECTUS

References to Shares of Common Stock in this Prospectus Assume Completion of
Reverse Stock Split

      Prior to the effectiveness of the registration statement to which this
prospectus relates, we intend to file an amendment and restatement of our
certificate of incorporation, which, among other things, will effect a reverse
stock split pursuant to which each share of our common stock then outstanding
will be converted into 0.2248318 of one share of our common stock. See
"Description of Securities -- Reverse Stock Split."

      Unless otherwise indicated, all references in this prospectus to (1) the
number of shares of our common stock outstanding, (2) the number of shares of
our common stock issuable upon exercise or conversion, as the case may be, of
options, warrants or convertible notes or (3) the number of shares of our common
stock reserved for issuance, assumes the filing of such amendment.

All Information in this Prospectus Assumes that we have Obtained all Required
Shareholder Approvals on or Prior to Effectiveness of the Registration Statement
to which this Prospectus Relates.

      The following actions require shareholder approval prior to the
effectiveness of the registration statement to which this prospectus relates in
order to make certain information in this prospectus true and accurate:

      o     Filing of amendments and restatements of our certificate of
            incorporation, to, among other things, (1) reallocate the number of
            shares authorized for issuance among our preferred stock and the
            various series of our preferred stock, (2) redesignate the powers,
            preferences and rights of, and the qualifications, limitations and
            restrictions granted to and imposed upon holders of various series
            of our preferred stock, and (3) effect a reverse stock split
            pursuant to which each share of our common stock then outstanding
            will be converted into 0.2248318 of one share of our common stock,
            all as described in this prospectus. See "Description of
            Securities."

      o     Amendment and restatement of our 2000 Nephros Equity Incentive Plan,
            to, among other things, increase the aggregate number of shares of
            our common stock subject to options covered by our 2000 Nephros
            Equity Incentive Plan from 1,011,743 to 1,124,159, with the adoption
            of our Amended and Restated 2000 Nephros Equity Incentive Plan.

      We anticipate that we will obtain the required shareholder approval prior
to the effectiveness of the registration statement to which this prospectus
relates. Accordingly, all information in this prospectus assumes that all such
shareholder approvals have been obtained.

Over-allotment Option Granted to the Underwriters has not been Exercised

      Unless otherwise indicated, all information in this prospectus assumes
that the over-allotment option granted to the underwriters by us has not been
exercised.

Warrants and Convertible Notes are Subject to Antidilution Adjustments

      Unless otherwise indicated, the number of shares of capital stock subject
to all options, warrants and convertible notes referred to in this prospectus
are subject to provisions known as "antidilution adjustments" that may increase
or decrease the number of shares issuable upon exercise or conversion thereof
and proportionately adjust the exercise price of options and warrants.

Dollar References are to U.S. Dollars

      Unless otherwise indicated, all dollar references in this prospectus are
to U.S. dollars.


                                       17


                                 USE OF PROCEEDS

      At an assumed initial offering price of $6.00 per share, net proceeds of
this offering will be approximately $11,955,000, after deducting underwriting
discounts and commissions and other expenses, and, if the underwriters'
over-allotment option is exercised, net proceeds of this offering will be
approximately $13,939,500, after deducting underwriting discounts and
commissions and other expenses. We estimate that underwriting discounts and
commissions and other expenses of this offering will be in the aggregate amount
of approximately $3,045,000 and, if the underwriters' over-allotment option is
exercised, approximately $3,310,500. As there has been no public market for our
common stock, the assumed initial public offering price of our common stock has
been determined by negotiation between us and the underwriters.

      We intend to use approximately $110,000 of the net proceeds of this
offering to repay loans made to us during 2001 and 2002 from Eric A. Rose, M.D.,
the chairman of our board of directors, a director and a holder of more than 5%
of our common stock. See "Certain Transactions." These loans are payable when we
have sufficient funds available to repay them and do not bear any interest. We
intend to use approximately $250,000 (plus interest as described below) of the
net proceeds of this offering to repay two loans made to us on December 26, 2002
by Joseph Giamanco and George Hatsopoulis in the principal amount of $200,000
and $50,000, respectively. Each of these loans is payable on the earlier to
occur of 30 days after the consummation of this offering and December 26, 2003
and bears interest, calculated quarterly in arrears, at a rate of 7% per annum
from December 26, 2002 to March 31, 2003, 10% per annum from April 1, 2003 to
April 30, 2003, and 15% per annum from May 1, 2003 to December 26, 2003. We
received net proceeds from these loans (after deducting $25,000 paid to
Hermitage Capital Corporation, as placement agent in connection with these
loans; see "Certain Transactions") in the aggregate amount of $225,000,
approximately $150,000 of which, as of the date of this prospectus, we have used
for working capital purposes, including for employee salaries and wages, travel
and other expenses incurred in connection with this offering and other operating
costs, and the remaining $75,000 of which we intend to use for similar working
capital purposes through and, to the extent available, after, the consummation
of this offering. We intend to use approximately $3,600,000 of the net proceeds
of this offering for the marketing and sales of our products through active
solicitation of customers by exhibiting at trade shows, advertising in trade
magazines and setting up a sales group to solicit prospective customers. We
intend to use approximately $6,000,000 of the net proceeds to complete our
clinical studies, obtain appropriate regulatory approvals and expand our
research and development with respect to our products. We intend to use
$1,500,000 of the net proceeds of this offering to repay a note that we expect
to issue to Lancer Offshore, Inc. pursuant a settlement agreement with Lancer
Offshore, Inc., dated as of January 31, 2003. The note will be payable upon the
earlier to occur of (i) January 31, 2004 and (ii) seven business days after we
receive the net proceeds of this offering, and does not bear any interest. See
"Business - Settlement Agreements." We intend to use $350,000 of the net
proceeds to pay Plexus Services Corp., a former supplier, amounts due under our
settlement agreement with Plexus, $250,000 of which is due upon the consummation
of this offering (or earlier if we raise $1,250,000 of additional capital prior
to the consummation of this offering) and the remaining $100,000 of which was
due on February 7, 2003 (which date Plexus has consented to extend to the date
the payment of the $250,000 is due). See "Business - Settlement Agreements." We
intend to use a portion of the net proceeds for payment of dividends on shares
of our series B convertible preferred stock and series C convertible preferred
stock accruing from November 1, 2002 to the date of the consummation of this
offering, which dividends shall accrue at a rate of 6% per annum and which were
approximately $59,000 as of December 31, 2002. We intend to use the remaining
amount of the net proceeds for working capital purposes, including for
additional salaries and wages as our organization grows and as we establish
offices in Europe, and for additional professional fees and expenses and other
operating costs. In the event the underwriters' over-allotment option is
exercised, we will realize additional net proceeds, which we intend to use for
working capital and general corporate purposes.

      The foregoing represents our best estimate of the allocation of the net
proceeds of this offering based upon the current status of our business. This
estimate is based on certain assumptions, including the development of our
business in the way we anticipate. If any of our assumptions prove incorrect, we
may find it necessary to reallocate a portion of the proceeds within the
above-described categories or use portions of the proceeds for other purposes.
For example, we are currently exploring possibilities for obtaining financing of
up to an aggregate amount of $2,000,000 to use for working capital purposes
through the consummation of this offering. We may seek such financing through
loans or through the issuance of convertible notes pursuant to transactions
exempt from the registration requirements under the Securities Act. In either
event, we may be obligated to use a portion of the net proceeds of this offering
to repay amounts due under any such loans or convertible notes. Our estimates
may prove to be inaccurate, new programs or activities may be undertaken which
will require considerable additional expenditures or unforeseen expenses may
occur. Pending use, we will invest the net proceeds of this offering in bank
certificates of deposit and other fully insured investment grade interest
bearing securities. See "Risk Factors - We may invest or spend the proceeds of
this offering in ways with which you may not agree..."


                                       18


                                 DIVIDEND POLICY

      We have not declared or paid any cash or stock dividends on our common
stock since our inception in April 1997. We presently intend to reinvest
earnings to fund the development and expansion of our business and do not
anticipate paying cash dividends on our common stock in the foreseeable future.
The declaration of dividends will be at the discretion of our board of directors
and will generally depend upon our earnings, capital requirements, financial
position and general economic conditions.


                                       19


                                 CAPITALIZATION

      The following table sets forth our capitalization as of December 31, 2002:

      o     on an actual basis giving effect to an amendment to our certificate
            of incorporation to be filed prior to the commencement of this
            offering, which, among other things, will effect a reverse stock
            split pursuant to which each share of our common stock then
            outstanding will be converted into 0.2248318 of one share of our
            common stock prior to the effectiveness of the registration
            statement to which this prospectus relates;

      o     on a pro forma basis after giving effect to (i) a reverse stock
            split pursuant to which each share of our common stock then
            outstanding will be converted into 0.2248318 of one share of our
            common stock prior to the effectiveness of the registration
            statement to which this prospectus relates, and (ii) the automatic
            conversion of all outstanding series A convertible preferred stock,
            series B convertible preferred stock and series C convertible
            preferred stock into 2,305,755 shares of our common stock, upon the
            consummation of this offering; and

      o     on a pro forma basis as adjusted after giving effect to (i) a
            reverse stock split pursuant to which each share of our common stock
            then outstanding will be converted into 0.2248318 of one share of
            our common stock prior to the effectiveness of the registration
            statement to which this prospectus relates, (ii) the automatic
            conversion of all outstanding series A convertible preferred stock,
            series B convertible preferred stock and series C convertible
            preferred stock into 2,305,755 shares of our common stock, upon the
            consummation of this offering (iii) the receipt of net proceeds of
            $11,955,000 from the sale of the 2,500,000 shares of common stock in
            this offering at an assumed initial public offering price of $6.00
            per share, after deducting underwriting discounts and commissions
            and estimated offering expenses of $3,045,000, (iv) the repayment to
            a related party of a short-term loan in the principal amount of
            $110,000, (v) the repayment to Lancer Offshore, Inc. of a note in
            the principal amount of $1,500,000 that we expect to issue to it
            pursuant a settlement agreement (see "Business -- Settlement
            Agreements"), (vi) the conversion of outstanding convertible notes
            in the aggregate principal amount of $250,000 (see "Certain
            Transactions") and (vii) repayment of short-term loans in the
            aggregate principal amount of $250,000 (see "Use of Proceeds").



                                                                                               December 31, 2002
                                                                               ------------------------------------------------
                                                                                                                    Pro Forma As
                                                                                Actual (1)        Pro Forma (1)     Adjusted (1)
                                                                               ------------       ------------       ----------
                                                                                                    (unaudited)     (unaudited)
                                                                                                            
Loan from related party ..................................................     $    110,000       $    110,000       $         --
Short-term convertible note payable ......................................          250,000            250,000                 --
Short-term bridge financing, net of unamortized discount of $500,000 .....        1,000,000          1,000,000                 --
Short-term loan ..........................................................          250,000            250,000                 --
Series B Convertible Preferred Stock, par value $.001 per share:
  2,333,333 shares authorized, 2,333,333 shares issued and
  outstanding; pro forma - 2,333,333 shares authorized, none issued
  and outstanding; pro forma as adjusted - none authorized, none
  issued and outstanding .................................................        2,333,000                 --                 --
Series C Convertible Preferred Stock, par value $.001 per share: 3,140,000
  shares authorized, 3,137,550 shares issued and outstanding; pro forma -
  3,140,000 shares authorized, none issued and outstanding; pro forma as
  adjusted - none authorized, none issued and outstanding ................        3,552,550                 --                 --
Stockholders' equity (deficit):
Series A Convertible Preferred Stock, par value $.001 per share:
  4,500,000 shares authorized, 4,000,000 shares issued and
  outstanding; pro forma - 4,500,000 shares authorized, none
  issued and outstanding; pro forma as adjusted - none authorized,
  none issued and outstanding ............................................            4,000                 --                 --
Common Stock, par value $.001 per share: 30,000,000 shares
  authorized, 1,261,194 shares issued and outstanding; pro forma -
  30,000,000 share authorized, 3,566,950 shares issued and
  outstanding; pro forma as adjusted - 30,000,000 shares authorized,
  6,123,158 shares issued and outstanding (2) ............................            1,261              3,567              6,123
Additional paid-in capital ...............................................        7,016,239         12,903,483         24,605,927
Accumulated deficit from inception .......................................      (15,016,693)       (15,016,693)       (15,099,693)
                                                                               ------------       ------------       ------------
Total stockholders' equity (deficit) .....................................       (7,995,193)        (2,109,643)         9,512,357
                                                                               ------------       ------------       ------------
Total capitalization .....................................................     $   (499,643)      $   (499,643)      $  9,512,357
                                                                               ============       ============       ============



                                       20


- ----------
(1)   The number of shares of common stock to be outstanding after this offering
      is based on the number of shares outstanding as of December 31, 2002, and
      does not include the following:

      o     375,000 shares of common stock issuable upon exercise of the
            underwriters' over-allotment option;

      o     250,000 shares of common stock issuable upon the exercise of the
            underwriters' warrants;

      o     783,876 shares of common stock underlying stock options granted and
            outstanding pursuant to our equity incentive plan;

      o     128,154 shares of common stock underlying stock options to be
            granted to our president and chief executive officer pursuant to our
            equity incentive plan prior to the consummation of this offering;

      o     30,000 shares of common stock underlying stock options to be granted
            to certain of our directors pursuant to our equity incentive plan
            upon the consummation of this offering;

      o     134,899 shares of common stock issuable upon exercise of warrants
            issued in June 2002 to Plexus Services Corp., a former supplier. See
            "Description of Securities -- Other Warrants" and "Business --
            Settlement Agreements;"

      o     28,104 shares of common stock issuable upon conversion of shares of
            our series A preferred stock which are themselves issuable upon
            exercise of warrants issued to convertible note holders;

      o     75,000 shares of common stock issuable upon exercise of warrants
            issued to Lancer Offshore, Inc. See "Description of Securities --
            Other Warrants" and "Business -- Settlement Agreements;" or

      o     60,000 shares of common stock issuable upon exercise of warrants
            expected to be issued to a placement agent. See "Description of
            Securities -- Other Warrants" and "Business -- Settlement
            Agreements."


                                       21


                                    DILUTION

      Purchasers of our common stock in this offering will experience immediate
and substantial dilution in the net tangible book value of the common stock from
the initial public offering price. Net tangible book value per share represents
the amount of our tangible assets reduced by the amount of our total
liabilities, divided by the number of shares of common stock outstanding.

      As of December 31, 2002, our pro forma net tangible book value was
$(3,055,643), or approximately $(0.86) per share of common stock after giving
effect to our reverse stock split and the conversion of all outstanding shares
of our series A convertible preferred stock, series B convertible preferred
stock and series C convertible preferred stock into shares of our common stock.

      As of December 31, 2002, our pro forma net tangible book value as adjusted
for (1) the sale of the 2,500,000 shares of our common stock offered in this
offering and application of the net proceeds of $11,955,000 (at the assumed
initial public offering price of $6.00 per share and after deducting the
underwriting discounts and commissions and estimated offering expenses of
$3,045,000), (2) the repayment to a related party of a short-term loan in the
principal amount of $110,000, (3) the repayment to Lancer Offshore, Inc. of a
note in the principal amount of $1,500,000 that we expect to issue to it
pursuant a settlement agreement (see "Business -- Settlement Agreements"), (4)
the conversion of outstanding convertible notes in the aggregate principal
amount of $250,000 (see "Certain Transactions") and (5) the repayment of
short-term loans in the aggregate principal amount of $250,000 (see "Use of
Proceeds"), would have been approximately $1.62 per share.

      This represents an immediate increase of $2.48 per share to existing
stockholders and an immediate and substantial dilution of $4.45 per share to new
investors purchasing common stock in this offering.

      The following table illustrates this per share dilution:

                                                                    Per Share of
                                                                    Common Stock
                                                                    ------------
Assumed initial public offering price per share of common stock .    $ 6.00
  Pro forma net tangible book value as of December 31, 2002 .....    $(0.86)
  Increase attributable to new investors ........................      2.41
                                                                     ------
Pro forma net tangible book value after this offering ...........      1.55
                                                                     ------
Dilution of net tangible book value to investors in this offering    $ 4.45
                                                                     ======

      The following table summarizes on a pro forma basis, as of December 31,
2002, the number of shares of common stock purchased from us, the total
consideration paid and the average price per share paid by existing holders of
our common stock, including the conversion of the all outstanding series A
convertible preferred stock, series B convertible preferred stock and series C
convertible preferred stock as well as conversion of outstanding convertible
notes in the aggregate principal amount of $250,000 into shares of our common
stock, and investors in this offering, assuming the sale of all 2,500,000 shares
offered by this prospectus at the price indicated above and before deducting any
underwriting discounts and offering expenses payable by us.



                                       Shares                      Total Consideration
                             --------------------------       ----------------------------         Average
                               Number         Percent           Amount           Percent          Per Share
                             ---------      -----------       -----------      -----------       -----------
                                                                                  
Existing Stockholders        3,623,158               59%      $10,387,550               41%      $      2.87
New Investors .......        2,500,000               41%      $15,000,000               59%      $      6.00
                             ---------      -----------       -----------      -----------

   Total ............        6,123,158              100%      $25,387,550              100%
                            ==========       ===========      ===========       ===========



                                       22



      The above discussion and tables exclude:

      o     375,000 shares of common stock issuable upon exercise of the
            underwriters' over-allotment option;

      o     250,000 shares of common stock issuable upon the exercise of the
            underwriters' warrants;

      o     783,876 shares of common stock underlying stock options granted and
            outstanding pursuant to our equity incentive plan;

      o     128,154 shares of common stock underlying stock options to be
            granted to our president and chief executive officer pursuant to our
            equity incentive plan prior to the consummation of this offering;

      o     30,000 shares of common stock underlying stock options to be granted
            to certain of our directors pursuant to our equity incentive plan
            upon the consummation of this offering;

      o     134,899 shares of common stock issuable upon exercise of warrants
            issued in June 2002 to Plexus Services Corp., a former supplier. See
            "Description of Securities -- Other Warrants" and "Business --
            Settlement Agreements;"

      o     28,104 shares of common stock issuable upon conversion of shares of
            our series A preferred stock which are themselves issuable upon
            exercise of warrants issued to convertible note holders;

      o     75,000 shares of common stock issuable upon exercise of warrants
            issued to Lancer Offshore, Inc. See "Description of Securities --
            Other Warrants" and "Business -- Settlement Agreements;" and

      o     60,000 shares of common stock issuable upon exercise of warrants
            expected to be issued to a placement agent. See "Description of
            Securities -- Other Warrants" and "Business -- Settlement
            Agreements."



                                       23


                         SELECTED FINANCIAL INFORMATION

            The following selected financial information should be read in
connection with, and are qualified by reference to, the financial statements and
related notes and "Management's Discussion and Analysis of Financial Condition
and Results of Operations" appearing elsewhere in this prospectus. The statement
of operations data for the years ended December 31, 2001 and 2000 for the period
from our inception on April 3, 1997 through December 31, 2002 and the balance
sheet data as of December 31, 2001 are derived from our financial statements,
which have been audited by Grant Thornton LLP, independent auditors. All share
and per share data give effect to an amendment to our certificate of
incorporation to be filed prior to the commencement of this offering which,
among other things, will effect a reverse stock split pursuant to which each
share of our common stock then outstanding will be converted into 0.2248318 of
one share of our common stock prior to the effectiveness of the registration
statement to which this prospectus relates.

Statement of Operations Data



                                                        From                  Year Ended
                                                    Inception to
                                                     December 31,      December 31,      December 31,
                                                        2002               2002               2001
                                                    ------------       ------------       ------------
                                                                                 
Revenue - other                                     $    300,000       $         --       $    300,000

Operating Expenses:
    Research and development                           9,955,645            957,616            737,858
    General and administrative                         4,360,058          1,097,400            652,828
                                                    ------------       ------------       ------------
Loss from operations                                 (14,015,703)        (2,055,016)        (1,090,686)

Other income, net                                        152,990            362,026              5,497
                                                    ------------       ------------       ------------

Net loss                                             (14,168,693)        (2,417,042)        (1,085,189)
Cumulative preferred dividends and accretion            (848,000)          (365,000)          (314,000)
                                                    ------------       ------------       ------------
Net loss attributable to common stockholders         (15,016,693)        (2,782,042)        (1,399,189)
                                                    ============       ============       ============
Net loss per share:
    Basic and Diluted                                                  $      (2.21)      $      (1.11)
                                                                       ============       ============
Weighted average shares outstanding:
    Basic and Diluted                                                     1,261,194          1,259,957
                                                                       ============       ============

Pro forma per share data (unaudited):
Pro forma net loss per share (1)
    Basic and Diluted                                                  $      (0.69)      $      (0.33)
                                                                       ============       ============

Pro forma weighted-average shares outstanding:
    Basic and Diluted                                                     3,500,487          3,308,706
                                                                       ============       ============


- ----------
(1)   Pro forma net loss per share gives effect to conversion of all mandatorily
      convertible preferred stock (including accrued preferred dividends) into
      common stock.


                                       24


Balance Sheet Data

                                                    December 31, 2002
                                                Actual           Pro Forma (1)
                                             -----------         -----------
                                             (Unaudited)

Cash and cash equivalents                    $   240,412         $   240,412
Working capital (deficiency)                  (2,190,242)         (2,190,242)
Total assets                                   1,279,583           1,279,583
Short-term debt, net                           1,610,000           1,610,000
Redeemable preferred stock                     5,885,550                  --
Stockholders'  equity (deficit)              $(7,995,193)        $(2,109,643)

- ----------
(1)  Gives effect to the conversion of all mandatorily convertible preferred
     stock (including accrued preferred dividends) into common stock upon
     completion of this initial public offering.


                                       25


          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                            AND RESULTS OF OPERATIONS

      The following discussion should be read in conjunction with the financial
statements and notes thereto included elsewhere in this prospectus.

Overview

      Since our inception in April 1997, we have been engaged in the development
of hemodiafiltration products and technologies for treating patients with End
Stage Renal Disease, or ESRD. Our products include the OLpur(TM) MD190, a
dialyzer, OLpur(TM) H(2)H(TM), an add-on module designed for use with existing
hemodialysis machines and controlled by advanced software with a simplified user
interface, and the OLpur(TM) NS2000 system, a stand-alone HDF machine and
associated filter technology. We have developed prototypes for all of these
products.

      To date, we have devoted substantially all of our efforts to research,
clinical development and establishing strategic alliances for the development,
production and sale of our products in Europe and the United States upon their
approval by appropriate regulatory authorities. We have not derived any revenues
from product sales and expect to generate product revenues no earlier than 2003.
Because we intend to initially introduce our products in Europe, we will be
subject to price fluctuations of the Euro and possibly other foreign currencies.

      We have incurred losses since our inception. At December 31, 2002, we had
a deficit accumulated during the development stage of $15.0 million. We expect
to incur additional losses in the foreseeable future at least until such time,
if ever, that we successfully complete the development of our products, obtain
the required regulatory clearances and successfully manufacture and market our
products.

      The following trends, events and uncertainties may have a material impact
on our potential sales, revenue and income from operations: (1) the completion
of our regulatory approval process; (2) the completion of our clinical trials;
(3) our ability to influence the adoption of our technology and other processes
by physicians, nephrologists and other medical professionals in our target
markets; and (4) the consolidation of dialysis clinics into larger clinical
groups. To the extent we are unable to succeed in accomplishing (1) through (3),
we may not be able to generate any sales or our sales could be lower than
expected and dramatically affect our ability to generate income from operations.
With respect to (4), the impact may be positive in the case where dialysis
clinics consolidate into independent chains, or a negative in the case where
competitors acquire these dialysis clinics and use their own products, which
they have historically tended to do.

Plan of Operation

      Based on our cash flow projections, we expect that the net proceeds from
this offering will be sufficient to satisfy our cash needs, with no further
financing required to obtain positive cash flow, through July 2004. If our sales
do not meet our projections, we may need to raise additional funds through
additional public or private offerings of our securities. In such event, if we
are unable to raise additional funds on a timely basis or at all, any progress
with respect to our products, and, therefore, our profits would be adversely
affected.

      We intend to focus our research and development efforts for the next
twelve months primarily on:

            o     achieving regulatory approval for the OLpur(TM) MD190 in
                  western Europe during the spring of 2003 and in the United
                  States during the spring of 2004, at an estimated cost over
                  the next twelve months (excluding the cost of clinical studies
                  required for such approvals) of approximately $575,000;

            o     continuing our clinical studies on the OLpur(TM) MD190 to
                  provide definitive demonstration of the OLpur(TM) MD190's
                  efficacy, the first of which we initiated in January 2003 by
                  commencing the process of selecting patients to participate in
                  the study and expect to continue through the first quarter of
                  2003 and the second of which we intend to initiate in the
                  summer of 2003 and expect to continue through the summer of
                  2004, at an estimated cost over the next twelve months
                  (including the cost of clinical studies required for
                  regulatory approvals) of approximately $1.6 million; and


                                       26


            o     completing our OLpur(TM) H(2)H(TM) product by year-end 2003
                  and achieving regulatory approval for the OLpur(TM) H(2)H(TM)
                  product in both western Europe and the United States during
                  the spring of 2004, at an estimated cost over the next twelve
                  months (including the cost of clinical studies) of
                  approximately $2.3 million.

We estimate that cost of our purchase of production-related equipment and
tooling for placement at facilities of our manufacturers in order to reduce our
manufacturing costs will be approximately $1.0 million over the next twelve
months. This cost is reflected in our estimated costs for (i) achieving
regulatory approvals for the OLpur(TM) MD190 and (ii) for completing our
OLpur(TM) H(2)H(TM) product and achieving regulatory approval for the OLpur(TM)
H(2)H(TM), as described above. For additional information with respect to our
research and development efforts, see the discussions under the captions "Our
Products," "Our Strategy," "Clinical Testing," and "Governmental Regulation"
under the "Business" section of this prospectus.

      We intend to focus our sales and marketing efforts for the next twelve
months primarily on:

            o     initiating the marketing of the OLpur(TM) MD190 in western
                  Europe and the United States as soon as we obtain the
                  requisite regulatory approvals (which we have targeted for the
                  spring of 2003 and the spring of 2004, respectively); and

            o     initiating the marketing of the OLpur(TM) H(2)H(TM) in western
                  Europe and the United States as soon as we obtain the
                  requisite regulatory approvals (which we have targeted for the
                  spring of 2004).

We estimate that the total costs of these sales and marketing efforts over the
next twelve months will be approximately $2.2 million. For additional
information with respect to our sales and marketing strategy, see the discussion
under the caption "Sales and Marketing" under the "Business" section of this
prospectus.

      We anticipate that if we successfully focus our research and development
and sales and marketing efforts over the next twelve months as described above,
we could begin to generate revenues from sales of the OLpur(TM) MD190 in western
Europe by July 2003. We do not anticipate, however, that we will begin to
generate revenues from sales of the OLpur(TM) MD190 in the United States or from
sales of the OLpur(TM) H(2)H(TM) in western Europe or the United States before
spring of 2004.

      We plan to add four to six members to our sales staff in each of Europe
and the United States, as well as three to four members to our administrative
staff in Europe. We intend to make our European staff additions at or around the
time we obtain regulatory approval of the OLpur(TM) MD190 in the European Union,
which we have targeted for the spring of 2003. We intend to make our U.S. staff
additions at or around the time we obtain regulatory approval for the OLpur(TM)
MD190 in the United States, which we have targeted for the spring of 2004. While
we intend for our European sales staff to be compensated on a primarily salary
basis due to European employment rules, we intend for our U.S. sales staff to be
compensated on a combined salary-and-commission basis.

Results of Operations

Year Ended December 31, 2002 Compared to the Year Ended December 31, 2001

      Revenues. There were no revenues for the year ended December 31, 2002
compared to $300,000 for the year ended December 31, 2001, a decrease of
$300,000. The decrease was due to a collaborative product feasibility study we
had contemplated with Gambro Renal Products, a division of The Gambro Company,
that was initiated and terminated during the last quarter of 2001. Prior to
initiating the study, Gambro terminated our agreement and paid us a termination
fee of $300,000. As of the date of this prospectus, we do not have any plans to
enter into any agreements of this nature.

      Research and Development. Research and development expenses are comprised
of personnel and scientific and engineering consultants and related costs,
machine and product parts and software, product testing, patent expenses and
clinical studies.

      Research and development expenses were $957,616 for the year ended
December 31, 2002 compared to $737,858 for the year ended December 31, 2001, an
increase of $219,758. The increase was primarily due to expenses associated with
our initiation of our clincial trial processes and in furthering the development
of the OLpur(TM) MD190.


                                       27


      General and Administrative. Our general and administrative expenses
consist primarily of personnel and related costs for general corporate
functions, including finance, accounting, legal, human resources, facilities and
information systems expense.

      General and administrative expenses were $1,097,400 for the year ended
December 31, 2002 compared to $652,828 for the year ended December 31, 2001, an
increase of $444,572. The increase was primarily due to legal expenses relating
to general corporate matters and intellectual property matters, accounting
expenses and marketing expenses.

      Other Income, Net. Other income, net consists of interest income earned on
cash deposits and short-term investments, reduced by interest expense on notes
payable and gains and losses in sales of property and assets. During the year
ended December 31, 2002, other income also included a gain that resulted from a
settlement in June 2002 with Plexus Services Corp., a supplier of engineering
consulting services, with respect to a claim for payment by us to Plexus of
approximately $1,900,000 for engineering consulting services relating to the
research and development of our OLpur(TM) NS2000. Pursuant to the settlement
agreement, Plexus agreed to release us from liability with respect to its claim
in exchange for (1) our issuance to Plexus of warrants to purchase 134,899
shares of our common stock and (2) our payment to Plexus of an aggregate amount
of $650,000 in three installments. We paid the first installment of $300,000 in
August 2002. The second installment of $100,000 was due on February 7, 2003;
however, Plexus has consented to extend the date for its receipt of payment of
this installment to the date on which the third installment is due. The third
installment of $250,000 is due when we raise $1,250,000 of additional capital.
See "Business -- Settlement Agreements."

      Other income (expense), net was $(362,026) for the year ended December 31,
2002 compared to $5,497 for the year ended December 31, 2001, a decrease of
$367,523. The decrease was primarily due to financing costs related to
short-term convertible notes offset by a gain that resulted from the forgiveness
of indebtedness by Plexus pursuant to the settlement agreement in June 2002 (see
"Business--Settlement Agreements").

      Net Income (Loss). As a result of the foregoing, we incurred a net loss of
approximately $2.4 million for the year ended December 31, 2002 compared to a
net loss of approximately $1.1 million for the year ended December 31, 2001.

Year Ended December 31, 2001 Compared to Year Ended December 31, 2000

      Revenues. Revenues were $300,000 for the year ended December 31, 2001
compared to zero for the year ended December 31, 2000. The increase was due to a
collaborative product feasibility study we had contemplated with Gambro Renal
Products, a division of The Gambro Company, that was initiated and terminated
during the last quarter of 2001. Prior to initiating the study, Gambro
terminated our agreement and paid us a termination fee of $300,000. As of the
date of this prospectus, we do not have any plans to enter into any agreements
of this nature.

      Research and Development. Research and development expenses were $737,858
for the year ended December 31, 2001 compared to approximately $4.8 million for
the year ended December 31, 2000, a decrease of approximately $4.1 million. The
decrease was primarily due to our discontinued use of Plexus Service Corp.'s
engineering consulting services with respect to the research and development of
our OLpur(TM) NS2000 in 2001. In 2000, our research and development expenses
attributable to Plexus' services were approximately $2.0 million. Due to capital
restraints and a refocus on disposable products as a possible means of
penetrating the market sooner, we decided to increase our research and
development efforts with respect to our products under development internally,
the OLpur(TM) MD190 and OLpur(TM) H(2)H(TM), thereby utilizing our own employees
and resources rather than making additional payments to an outside engineering
consulting firm. As a result of this decision, we have revised our target for
commencing the marketing of our OLpur(TM) NS2000 from 2004 to 2006 and our
financial projections through 2006 have been adjusted to reflect the revised
target. See "Business--Settlement Agreements."

      General and Administrative Expenses. General and administrative expenses
were approximately $652,828 for the year ended December 31, 2001 compared to
approximately $854,315 for the year ended December 31, 2000, a decrease of
approximately $201,487. The decrease was primarily due to lower staffing levels.

      Other Income, Net. Other income, net was $5,497 for the year ended
December 31, 2001 compared to $53,440 in the year ended December 31, 2000, a
decrease of $47,943. The decrease was primarily due to lower interest income in
2001 owing to lower average cash deposits and short-term investments on hand and
lower interest rates and to gain on the disposal of an asset in 2000.


                                       28


      Net Income (Loss). As a result of the foregoing, we incurred a net loss of
approximately $1.1 million for the year ended December 31, 2001 compared to a
net loss of approximately $5.6 million for the year ended December 31, 2000.

Liquidity and Capital Resources

      We have incurred losses since our inception. At December 31, 2002, we had
a deficit accumulated during the development stage of $15.0 million. We expect
to incur additional losses in the foreseeable future at least until such time,
if ever, that we successfully complete the development of our products, obtain
the required regulatory clearances and successfully manufacture and market our
products. Our independent auditors have included an explanatory paragraph in the
financial statements attached to this prospectus which expresses doubt as to our
ability to continue as a going concern.

      We have financed our operations to date primarily through private sales of
our equity and debt securities. Through December 31, 2002, we had received net
offering proceeds from private sales of equity and debt securities of
approximately $11.9 million. Since our inception in 1997 through December 31,
2002, we made approximately $419,000 of net capital expenditures and used $11.3
million in cash to support our operations. At December 31, 2002, we had cash,
cash equivalents and short-term investments of $240,412 and a working capital
deficit of $2,190,242.

      In addition, we are currently exploring possibilities for obtaining
financing of up to an aggregate amount of $2,000,000 to use for working capital
purposes through the consummation of this offering. We may seek such financing
through loans or through the issuance of convertible notes pursuant to
transactions exempt from the registration requirements under the Securities Act.
In either event, we may be obligated to use a portion of the net proceeds of
this offering to repay amounts due under any such loans or convertible notes.

      We expect to use the proceeds of this offering (1) to repay short-term
loans made to us during 2001 and 2002 from Eric A. Rose, M.D., the chairman of
our board of directors, a director and a holder of more than 5% of our common
stock, which loans have an outstanding balance of $110,000 as of the date of
this prospectus, are payable when we have sufficient funds available to repay
them and do not bear any interest (see "Certain Transactions"); (2) to repay two
short-term loans in the aggregate principal amount of $250,000 made to us on
December 26, 2002 from two lenders, the terms of which are described in "Use of
Proceeds;" (3) to repay a note in the principal amount of $1,500,000 that we
expect to issue to Lancer Offshore, Inc. pursuant a settlement agreement dated
as of January 31, 2003, the terms of which are described in "Business -
Settlement Agreements;" (4) for the marketing and sales of our products through
active solicitation of customers by exhibiting at trade shows, advertising in
trade magazines and setting up a sales group to solicit prospective customers;
(5) to complete our clinical studies, obtain appropriate regulatory approvals
and expand our research and development with respect to our products; (6) for
payment of amounts due under a settlement agreement with a former supplier; (7)
for payment of dividends on shares of our series B convertible preferred stock
and series C convertible preferred stock accruing from November 1, 2002 to the
date of the consummation of this offering; and (8) for working capital purposes,
including for additional salaries and wages as our organization grows and we
establish offices in Europe, and for additional professional fees and expenses
and other operating costs. For a description of our sales of debt and equity
securities generally, see "Certain Transactions." In addition, if we obtain
additional financing through loans or the issuance of convertible notes (as
discussed in the preceding paragraph), we may be obligated to use a portion of
the net proceeds of this offering to repay amounts due under any such loans or
convertible notes. In the event the underwriters' over-allotment option is
exercised, we will realize additional net proceeds, which we intend to use for
working capital and general corporate purposes. See "Use of Proceeds." We
anticipate, based on our currently proposed plans and assumptions, that the net
proceeds of this offering will be sufficient to satisfy our cash requirements,
with no further financing to obtain positive cash flow, through July 2004.

      Our funding needs will depend on many factors, including the timing and
costs associated with obtaining European or United States regulatory approval,
continued progress in research and development, clinical studies, manufacturing
scale-up, the cost involved in filing and enforcing patent claims and the status
of competitive products. In the event that our plans change, our assumptions
change or prove inaccurate, or if the proceeds of this offering, together with
other funding resources, otherwise prove to be insufficient to fund operations,
we could be required to seek additional financing sooner than currently
anticipated. We have no current arrangements with respect to sources of
additional financing. There can be no assurance that European Union or FDA
clearance or approval will be obtained in a timely manner or at all or that
additional financing will be available to us when needed, on commercially
reasonable terms, or at all.

      We have not generated taxable income to date. At December 31, 2002, the
net operating losses available to offset future taxable income were


                                       29


approximately $14.0 million. The carryforwards expire at various dates beginning
in 2012 through 2022. As a result of change in control, the carryforwards may be
subject to an annual limitation, so that a portion of these carryforwards may
expire before ultimately becoming available to reduce federal income tax
liabilities.

Recent Accounting Pronouncements

      In July 2002, the FASB issued SFAS No. 146, "Accounting for Costs
Associated with Exit or Disposal Activities." SFAS 146 requires companies to
recognize costs associated with exit or disposal activities when they are
incurred rather than at the date of commitment to an exit or disposal plan. SFAS
146 will be applied to exit or disposal activities after December 31, 2002 and
is not expected to have a material effect on our financial position or results
of operations.



                                       30



                                    BUSINESS

Overview

      We are a Delaware corporation founded in 1997 by health professionals,
scientists and engineers affiliated with Columbia University to develop advanced
End Stage Renal Disease, or ESRD, technology and products that would address
both patient treatment needs and the clinical and financial needs of the
treatment provider. We have developed three products to deliver an improved
hemodiafiltration, or HDF, process for ESRD patients. These are the OLpur(TM)
MD190, a dialyzer, OLpur(TM) H(2)H(TM), an add-on module designed for use with
existing hemodialysis machines and controlled by advanced software with a
simplified user interface, and the OLpur(TM) NS2000 system, a stand-alone HDF
machine and associated filter technology. We believe these products are more
effective than any products currently available for ESRD therapy. In laboratory
bench studies conducted by members of our research and development staff, our
HDF products have been shown to remove a range of larger toxins, known
collectively as "middle molecules" due to their molecular weight, more
effectively than existing hemodialysis or hemodiafiltration methods. These
middle molecules are thought to contribute to such conditions as malnutrition,
impaired cardiac function, carpal tunnel syndrome, and degenerative bone disease
in the ESRD patient. See "Business -- Limitations of Extracorporeal Renal
Replacement Therapies."

      One theory in the medical community, which we support and was documented
in an article by Dr. R. Ward et al. in the Journal of American Society of
Nephrology in December 2000, is that some of the morbidity associated with
chronic hemodialysis is thought to result from the retention of middle molecules
that are not effectively removed by diffusion in conventional hemodialysis.
According to an article by H. Tang et al. in the Hong Kong Journal of
Nephrology, published in 2001, the HDF process offers some improvement over
high-flux hemodialysis therapies by removing more middle molecules at a faster
rate. Further, convective therapies such as HDF have been shown to improve
treatment delivery and treatment tolerance when compared to conventional
hemodialysis, according to an abstract by Bosch et al. in the journal Curr Opin
Nephrol Hypertens in 1998.

      We believe that our products will reduce hospitalization, medication and
care costs as well as improve patient health (including reduced drug
requirements and improved blood pressure profile), and, therefore, quality of
life, by removing a broad range of toxins through a more patient-friendly,
better-tolerated process. We believe that the OLpur(TM) MD190 and the OLpur(TM)
H(2)H(TM) will provide these benefits to ESRD patients without significant
capital expenditures for the ESRD treatment provider. We also believe that the
OLpur(TM) NS2000 system will increase profitability for the ESRD treatment
provider by providing a more effective treatment in less time. See "Business --
Our Products."

      We have not derived any revenues from our operations, hold minimal assets
and have incurred losses since our inception primarily as a result of our
research and development efforts. To date, we have relied on private sales of
our securities and loans from our shareholders to fund operations.

Industry Background

      ESRD is characterized by irreversible loss of kidney function. A healthy
kidney removes excess water and various waste products from the blood stream, a
process critical to maintaining life. When kidney function drops below certain
parameters, treatment is required for patient survival. There are currently only
two methods for treating ESRD; renal replacement therapy and kidney
transplantation. According to the 1997 Frost & Sullivan Report, the shortage of
suitable kidneys for transplants will mean that patients will need some form of
renal replacement therapy, and the supplies it requires. The renal replacement
treatment options are described below under "Current ESRD Therapy Options."

      According to U.S. Congressman Pete Stark's introduction of the proposed
End Stage Renal Disease Quality Improvement Act of 2002 (H.R. 5141) in the House
of Representatives on July 16, 2002, there were approximately 340,000 ESRD
patients in the United States. According to the Lysaght Article, as of mid-year
2001, the number of dialysis patients worldwide was estimated to be over 1.1
million and the size of this population has been expanding at rate of
approximately 7% per year. According to the United States Renal Data System's
2001 Annual Data Report, as of December 31, 1999, within the United States,
approximately 71% of the ESRD population received dialysis treatment,
approximately 87% of whom received hemodialysis treatment administered by care
providers on an outpatient basis at dialysis centers. Based on the Merrill
Report, and by our calculations, we estimate that of the dialysis patients
worldwide, approximately 27% are in the United States, approximately 23% are in
Europe and approximately 50% are in regions outside of the United States and
Europe.


                                       31


      According to the Lysaght Article, assuming current trends in ESRD
prevalence continue, the number of dialysis patients worldwide will exceed over
two million by 2010 and the total aggregate expenditure on ESRD patient care is
expected to exceed $1 trillion over the next decade. According to the 1997 Frost
& Sullivan Report, growth drivers of the ESRD population are the aging
population and the increase in incidence of diabetes. According to the same
report, in 2025, the number of people worldwide who are more than 65 years old
will have almost doubled from the 1950 figure reaching 800 million. According to
the U.S. Census Bureau and the Centers for Medicare and Medicaid Services
(formerly known as the Health Care Financing Administration), respectively, on
January 1, 2000, 21% of the U.S. population was 55 years old or older, but, as
of December 31, 1999, this group comprised a disproportionate 56% of U.S.
Medicare ESRD cases.

      According to the 1997 Frost & Sullivan Report, dialysis machines are
generally replaced on average every seven years. According to this report, the
dialysis machine market was projected to grow from 1996 to 2003 at a compounded
annual rate of approximately 10.1% in the United States and 10.6% worldwide.
Based on these growth rates, by 2010, we expect that the dialysis machine market
will exceed $600 million in the United States and $2.5 billion worldwide, with
dialysis machine sales worldwide exceeding 120,000 units annually.

      The dialysis filter (also referred to as a dialyzer or an "artificial
kidney") is an essential component of dialysis machines. According to the 1997
Frost & Sullivan Report, the world hemodialysis dialyzer market was projected to
be $3.53 billion and to be growing at a rate of approximately 10.8% per year in
2002. According to this report, the world hemodialysis dialyzer market was
projected to grow from 1996 to 2003 at a compounded annual rate of approximately
10.5%. Based on this growth rate, we expect that the world hemodialysis dialyzer
market could more than double in the next decade, reaching approximately $8
billion by 2010. In 2002, approximately 33.4 million hemodialysis dialyzers were
projected to be shipped into European markets and the number of hemodialysis
patients in Europe was projected to reach 223,000, according to Frost &
Sullivan's 2000 European Renal Replacement Equipment and Supplies Market Report.

      We initially intend to compete in the HDF dialyzer market with our
OLpur(TM) MD190 in western Europe. If we can obtain FDA approval of the
OLpur(TM) MD190 and the OLpur(TM) H(2)H(TM), we will compete in the U.S.
hemodialysis dialyzer market by combining our OLpur(TM) MD190 with an OLpur(TM)
H(2)H(TM) to enable the HDF process on hemodialysis machines.

      There is an important distinction between the United States and
European/Asian dialyzer markets. In the United States, a majority of dialysis
clinics re-use dialyzers. Reuse refers to the procedure by which a dialyzer is
disinfected and reused by the same patient. According to the 1997 Frost &
Sullivan Report, dialysis clinics in the United States reused dialyzers 14 times
on average during 1996 and this average is expected to increase over time.

      However, according to the 1997 Frost & Sullivan Report, reuse is not
generally accepted in Europe or Japan. According to the same report, in Japan,
dialyzer reuse is illegal and some countries in Europe also forbid the reuse of
dialyzers, although this is beginning to change in some regions. As a result,
Europe and Asia provide substantially larger disposables markets. Assuming
patients receive three treatments per week, we estimate that up to 156 dialyzers
per patient per year are used in the European and Asian markets where dialyzers
are generally not reused.

Current ESRD Therapy Options

      Current renal replacement therapy technologies include (1) two types of
dialysis, peritoneal dialysis and hemodialysis, (2) hemofiltration and (3)
hemodiafiltration, a combination of hemodialysis and hemofiltration. While there
are variations in each approach, in general, the three major categories of renal
replacement therapy in the marketplace today are defined as follows:

      o     Peritoneal Dialysis, or PD, uses the patient's peritoneum, the
            membrane lining covering the internal abdominal organs, as a filter
            by introducing injectable-grade dialysate solution into the
            peritoneal cavity through a surgically implanted catheter. After
            some period of time, the fluid is drained and replaced. PD is
            limited in use because the peritoneal cavity is subject to scarring
            with repeated episodes of inflammation of the peritoneal membrane,
            reducing the effectiveness of this treatment approach. With time, a
            PD patient's kidney function continues to deteriorate and peritoneal
            toxin removal alone may become insufficient to provide adequate
            treatment. In such case the patient may switch to an extracorporeal
            renal replacement therapy such as hemodialysis or hemodiafiltration.

      o     Hemodialysis uses an artificial kidney machine to remove certain
            toxins and fluid from the patient's blood while controlling external
            blood flow and monitoring patient vital signs. Hemodialysis patients
            are connected to a dialysis


                                       32


            machine via a vascular access device. The hemodialysis process
            occurs in a dialyzer cartridge with a semi-permeable membrane which
            divides the dialyzer into two chambers: while the blood is
            circulated through one chamber, a premixed solution known as
            dialysate circulates through the other chamber. Toxins and excess
            fluid from the blood cross the membrane into the dialysate solution
            through a process known as "diffusion."

      o     Hemodiafiltration, or HDF, in its basic form combines the principles
            of hemodialysis with hemofiltration. Hemofiltration is a cleansing
            process without dialysate solution where blood is passed through a
            semi-permeable membrane which filters out solute particles. HDF uses
            dialysate solution with a negative pressure (similar to a vacuum
            effect) applied to the dialysate solution to draw additional toxins
            from the blood and across the membrane. This process is known as
            "convection." HDF thus combines diffusion with convection, offering
            efficient removal of small solutes by diffusion, with improved
            removal of larger substances (i.e. middle molecules) by convection.

Limitations of Current Extracorporeal Renal Replacement Therapies:

      Hemodialysis is the most common form of extracorporeal renal replacement
therapy and is generally used in the United States. Hemodialysis addresses the
water and waste issues sufficiently to sustain life, but fails, in our opinion,
to address satisfactorily the long-term health or overall quality of life of the
ESRD patient.

      In particular, current hemodialysis practices effectively address the
removal of smaller toxic molecules such as urea, but do not effectively address
the removal of middle molecules, the accumulation of which may lead to such
conditions as carpal tunnel syndrome, malnutrition and resulting cardiovascular
death. For example, a well-known middle molecule, a protein known as
(beta)2Microglobulin, is produced by the body on a continuous basis and removed
by a healthy kidney; however, according to an article by Dr. R. Ward et al.
published in the Journal of American Society of Nephrology in April 2000,
solutes of this size are poorly removed by conventional hemodialysis, and their
removal by diffusion through high-flux hemodialysis membranes is also limited.
According to a report on Amyloidosis and Kidney Disease published by the
National Institutes of Health in 2001, the accumulation of this protein in the
body of the ESRD patient leads to the formation of abnormal protein deposits
(dialysis related amyloidosis) and complications such as carpal tunnel syndrome,
joint pain and stiffness. In an article published in Blood Purification in 1999,
L.W. Henderson noted the inferential link between appetite-suppressing middle
molecular weight substances and the common observation of malnutrition in ESRD
patients maintained on hemodialysis or peritoneal dialysis, and according to a
study by Fung et al. published in American Journal of Kidney Diseases in August
2002, protein-energy malnutrition has been associated with a greater risk of
cardiovascular death.

      The HDF process, which is currently available in the European and Asian
marketplace, offers some improvement over dialysis therapies because of better
ESRD patient tolerance and superior blood purification of both small and middle
molecules. This superior blood purification may result in better over-all
patient health. A study by Locatelli et al., published in Kidney International
in 1999, showed that when ESRD patients are treated with hemofiltration or HDF,
the need for carpal tunnel syndrome surgery, an indication of patient morbidity,
was reduced by approximately 40%. According to another study by Kim, published
in Contributions to Nephrology in 1994, the aggressive removal of larger
proteins in the HDF process has shown to relieve some of the local and systemic
inflammatory processes. Furthermore, according to an article by Bonforte, et
al., published in the Journal of the International Society of Blood Purification
in 2002, it has also been shown that as patients are placed on HDF machines, the
level of hemoglobin in their blood typically increases and the need for
hemoglobin treatment and the related costs are reduced.

Current Dialyzer Technology used with HDF Systems:

      In our view, treatment efficacy of current HDF systems, as well as the
pace of the actual treatment, are limited by the current dialyzer technology.

      As a result of the negative pressure applied in HDF, fluid is drawn from
the blood and across the dialyzer membrane along with the toxins removed from
the blood. A portion of this fluid must be replaced with a man-made
injectable-grade fluid, known as "substitution fluid," in order to maintain the
blood's proper fluid volume. With the current dialyzer technology, fluid is
replaced in one of two ways: pre-dilution or post-dilution.

      o     With pre-dilution, substitution fluid is added to the blood before
            the blood enters the dialyzer cartridge. In this process, the blood
            can be over-diluted, and therefore more fluid can be drawn across
            the membrane. This enhances removal of toxins by convection.
            However, because the blood is diluted before entering the device, it
            actually reduces the rate of


                                       33


            removal by diffusion; the overall rate of removal, therefore, is
            reduced for small molecular weight toxins (such as urea) that rely
            primarily on diffusive transport.

      o     With post-dilution, substitution fluid is added to blood after the
            blood has exited the dialyzer cartridge. This is the currently
            preferred method because the concentration gradient is maintained at
            a higher level, thus not impairing the rate of removal of small
            toxins by diffusion. The disadvantage of this method, however, is
            that there is a limit in the amount of plasma water that can be
            filtered from the blood before the blood becomes too viscous, or
            thick. This limit is approximately 25% to 30% of the blood flow
            rate. This limit restricts the amount of convection, and therefore
            limits the removal of middle and larger molecules.

The Nephros Mid-Dilution Diafiltration Process

      Our OLpur(TM) MD190 uses a design and process we developed called
Mid-Dilution Diafiltration, or MDF. MDF is a fluid management system that
optimizes the removal of both small toxins and middle-molecules by offering the
advantages of pre-dilution HDF and post-dilution HDF combined in a single
dialyzer cartridge. The MDF process involves the use of two stages: in the first
stage, blood is filtered against a dialysate solution; it is then overdiluted
with sterile infusion fluid before entering a second stage, where it is filtered
once again against a dialysate solution. Based on laboratory bench studies
conducted on our OLpur(TM) MD190 by members of our research and development
staff, discussed below, we believe that the MDF process will provide improved
toxin removal in HDF treatments, with a resulting improvement in patient health.
See "Business -- Our Products -- OLpur(TM) MD190."

Our Products

      Our products, which are currently in the development stage or subject to
our receipt of regulatory approval, include:

      OLpur(TM) MD190

      OLpur(TM) MD190 is our dialyzer cartridge that incorporates the patented
MDF process and is designed for use with the existing HDF platforms currently
prevalent in Europe and Asia. We believe the OLpur(TM) MD190 incorporates a
unique blood-flow characteristic that enhances toxin removal with almost no cost
increase over existing devices currently used for HDF therapy.

      Laboratory bench studies have been conducted on our OLpur(TM) MD190 by
members of our research and development staff and by a third party. In
laboratory bench studies conducted by members of our research and development
staff, OLpur(TM) MD190 offered small molecule removal comparable to existing HDF
standards and an improvement of over 80% in removing middle molecules. In a
third-party study which was performed by the University of Kentucky in concert
with Baxter Renal Division, a division of Baxter Healthcare Corporation, each of
two prototypes of the OLpur(TM) MD190 offered urea (a small molecule) removal
comparable to an existing HDF dialyzer (which was used as a control device) and
an improvement of over 122% and 141%, respectively, in removing the protein
known as (beta)2Microglobulin (a middle molecule), when compared to the existing
HDF dialyzer.

      The Company began human clinical trials with the OLpur(TM) MD190 in
January 2003 with the commencement of the process of selecting patients to
participate in the trials. These trials are being conducted in Montpellier,
France under the supervision of Dr. Bernard Canaud, in his capacity as president
of L'institut de Recherche et de Formation en Dialyse, a research institution
located in Montpellier, France. Dr. Canaud is a published nephrologist
associated with the Hospal Lapeyronie in Montepellier, France. See "Business --
Clinical Testing."

      We have a placed a purchase order with TUV Rheinland of North America,
Inc., a worldwide testing and certification agency that performs conformity
assessments to European Union requirements for medical devices, to assist us in
obtaining the Conformite Europeenne, or CE, mark, a mark which demonstrates
compliance with relevant European Union requirements. TUV Rheinland of North
America, Inc. has agreed to charge us approximately $18,300 for agreed-upon
services. Except as described in this paragraph, we do not have a formal
agreement with TUV Rheinland of North America, Inc.

      We anticipate initiating European sales of OLpur(TM) MD190 in the spring
of 2003. We plan to seek U.S. regulatory approval later in the same year and to
begin marketing in the United States as soon as we obtain such approval, which
we estimate will be during the spring of 2004. We anticipate offering the
OLpur(TM) MD190 at a price comparable to the highest


                                       34


priced dialyzers sold in the relevant market at the time we introduce our
product to the market. We are unable to determine what the market prices will be
at that future time.

      OLpur(TM) H(2)H(TM)

      OLpur(TM) H(2)H(TM) is our add-on module that is designed to convert
hemodialysis machines into HDF-capable machines that can then be used with the
OLpur(TM) MD190. According to the United States Renal Data System's 2001 Annual
Data Report, as of December 31, 1999, there were 58,895 hemodialysis machines in
the United States. Based on the same report, we estimate that from 1990 through
1999, the number of hemodialysis machines in the United States was increasing at
an average annual growth rate of approximately 8.74%. At this average annual
growth rate, we estimate that there will be approximately 82,340 hemodialysis
machines in 2003. We also estimate that in 2003, approximately 85% of these
machines will be able to accommodate our OLpur(TM) H(2)H(TM). We base our
estimate on the following: (1) according to a survey of several equipment
resellers that we conducted, over 90% of used dialysis machines being resold in
the United States feature volumetric ultrafiltration control (the mechanism
required to use our H(2)H(TM) technology); and (2) Ausus Technologies, Inc., a
provider of repair service for dialysis machine circuit boards and modules,
which promotes itself as the largest independent service provider in the United
States, has indicated that at least 85% of the circuit cards it has sold or
repaired in the past year are used in machines with volumetric ultrafiltration
control.

      We have completed our OLpur(TM) H(2)H(TM) design and laboratory bench
testing, all of which were conducted by members of our research and development
staff. We plan to submit to the FDA for 510(k) approval of OLpur(TM) H(2)H(TM)
during the first quarter of 2004 and seek to acquire the CE mark during the
spring of 2004. We have targeted an introduction of the OLpur(TM) H(2)H(TM) in
the United States and Europe by the end of the spring of 2004. We plan to offer
the OLpur(TM) H(2)H(TM) at a nominal price in concert with long-term supply
agreements for dialyzers and other disposable products.

      OLpur(TM) NS2000

      OLpur(TM) NS2000 is our standalone HDF machine and associated filter
technology, which is in the development stage. In laboratory bench studies and
animal studies, conducted by members of our research and development staff,
OLpur(TM) NS2000 achieved industry standard urea removal 25% faster than current
hemodialysis technologies, while at the same time demonstrating over twice the
rate of clearance of HDF and over three times the rate of clearance of
hemodialysis in removing middle molecules. All studies on our OLpur(TM) NS2000
have been conducted by members of our research and development staff.

      Prototype machines have been manufactured and we have begun preliminary
testing. Once testing is completed, we plan to seek regulatory approval in the
United States. We have also designed and developed cartridges for use with
OLpur(TM) NS2000, which have been subjected to pre-manufacturing testing.
OLpur(TM) NS2000 is currently targeted for market introduction in the United
States in 2006.

Our Strategy

      We believe that the quality of life of the ESRD patients undergoing renal
replacement therapies, particularly hemodialysis, has generated demand for
improved treatments. We also believe that our products and patented technology
offer the ability to remove toxins more effectively than current dialysis
therapy. Our objective is to capitalize on the demand for improved therapy and
to generate market acceptance and market share for our products through a three
stage approach:

Showcase product efficacy in Western Europe:

      Subject to our receipt of regulatory approval, we plan to initiate western
European sales for the OLpur(TM) MD190 during the spring of 2003. We believe
that there is an immediate opportunity for sales of the OLpur(TM) MD190 in
western Europe because there is an established HDF machine base using disposable
(rather than re-usable) dialyzers. Assuming a three-times-per-week treatment
schedule using disposable dialyzers, one ESRD patient in Europe will use
approximately 156 dialyzers a year. Consequently, we believe that this presents
a substantial sales opportunity.

      We intend to market directly to major dialysis centers of the European
market, including to approximately 50 prominent practitioners in ESRD therapy.
We believe that an endorsement of our products by these specialists will
encourage others to follow.


                                       35


Convert existing hemodialysis machines to hemodiafiltration in Europe and the
U.S.:

      Concurrent with our western European introduction of OLpur(TM) MD190, we
will seek to complete comprehensive clinical trials to validate OLpur(TM)
H(2)H(TM), to complete our regulatory approval processes in western Europe for
OLpur(TM) H(2)H(TM) and to complete our regulatory approval processes in the
United States for both OLpur(TM) MD190 and OLpur(TM) H(2)H(TM). Our goal is to
initiate U.S. and European sales for the OLpur(TM) H(2)H(TM) and the OLpur(TM)
MD190 in 2003. Through the OLpur(TM) H(2)H(TM), we intend to introduce HDF
technology to the U.S. dialysis market.

Upgrade dialysis clinics to OLpur(TM) NS2000:

      We believe the introduction of the OLpur(TM) NS2000, targeted for 2006,
represents a further upgrade in performance for the dialysis clinic, which will
offer a substantial reduction in treatment time with markedly improved efficacy.
We believe the dialysis clinic will entertain OLpur(TM) NS2000 as an alternative
to its current technology at the dialysis clinic's machine replacement point.
According to the 1997 Frost & Sullivan Report, dialysis machines are generally
replaced on average every seven years.

Manufacturing and Suppliers

      We do not intend to manufacture any of our products or components. As of
the date of this prospectus, we are negotiating an agreement with Medica s.r.l.,
a developer and manufacturer of medical products with corporate headquarters
located in Italy, to assemble and produce our OLpur(TM) MD190 and are
negotiating with Membrana Gmbh, a manufacturer of medical and technical
membranes for applications like dialysis with corporate headquarters located in
Germany, to continue to produce the fiber for the OLpur(TM) MD190. We are in the
process of negotiating with additional independent manufacturers to ensure
multiple sourcing for our products and supplies. See "Risk Factors -- If we are
not able to successfully commercialize our products, then we will not be
profitable; If we are not able to ensure the timely delivery of our products,
then we may not be profitable; We may not be able to maintain sufficient quality
controls...; and The loss or interruption of services of any of our
manufacturers could slow or stop production of our products."

Sales and Marketing

      We are establishing our own sales and marketing organization to sell
products in western Europe and the United States. Our marketing staff has
experience in both these areas. From 1987 to 1996, our vice president-marketing
and sales held several senior positions at Fresenius Medical Care AG, including
the positions of vice president of sales and director of marketing. During the
second quarter of 2002, we engaged two marketing consultants based in Paris on a
contract basis to support the development of our sales and marketing
organization in Europe. To date, these consultants have participated in our
general marketing activities in Europe, including initiating contacts within the
physician community in Europe. In exchange for their consulting services, we
have granted these consultants non-qualified options to purchase an aggregate of
134,899 shares of our common stock, half of which vest on a periodic basis over
the next four years and the other half of which vest when certain milestones are
met.

      Our marketing strategy involves the marketing of our OLpur(TM) MD190 and
OLpur(TM) H(2)H(TM) within the ESRD therapy market in the following two phases:

      Phase I: In the first phase, we intend to market the OLpur(TM) MD190 to
      healthcare providers such as hospitals, dialysis clinics, managed care
      organizations and nephrology physician groups, which already own the
      equipment necessary to use the OLpur(TM) MD190 and/or understand
      hemodiafiltration therapy. We expect that we will be able to demonstrate
      the toxin removal advantages of the OLpur(TM) MD190 to those healthcare
      providers who have a working knowledge of hemodiafiltration therapy. We
      expect that our sales and marketing expenses during the first year of this
      marketing phase will be approximately $2.8 million. We plan to begin
      marketing the OLpur(TM) MD190 in western Europe and the United States as
      soon as we obtain the respective requisite approvals.

      Phase II: In the second phase, we intend to introduce the OLpur(TM)
      H(2)H(TM) to all healthcare providers within the ESRD therapy market. Our
      goal is to achieve market penetration by offering the OLpur(TM) H(2)H(TM)
      for use by healthcare providers at a nominal price in concert with
      long-term supply agreements for dialyzers and other disposable products,
      thus permitting the providers to use the OLpur(TM) H(2)H(TM) without a
      large initial outlay of capital. We believe that this will allow
      healthcare providers to upgrade their performance profile at an acceptable
      increase on a per treatment basis,


                                       36


      without replacing their existing machines. We estimate that the sales and
      marketing expenses during the first year of this marketing phase will be
      approximately $5.2 million. We plan to begin marketing the OLpur(TM)
      H(2)H(TM) in western Europe and the United States as soon as we obtain the
      respective requisite approvals.

As part of our marketing strategy, we also intend to introduce the OLpur(TM)
NS2000 in the United States if and when we obtain the requisite U.S. regulatory
approval. We have targeted the OLpur(TM) NS2000 for market introduction in the
United States in 2006.

      We have begun implementation of other plans to further our sales and
marketing efforts with respect to the OLpur(TM) MD190 and OLpur(TM) H(2)H(TM).
For example, we participated in the 29th Annual Congress of European Renal
Association - European Dialysis and Transplant Association in Copenhagen,
Denmark in July 2002 and the American Society of Nephrology's 35th Annual
Meeting in Philadelphia, Pennsylvania in November 2002. We also intend to
participate in the 30th Annual Congress of European Renal Association - European
Dialysis and Transplant Association in Berlin, Germany in June 2003 where we
will seek to obtain support for our anticipated launch of the OLpur(TM) MD190
and OLpur(TM) H(2)H(TM). We estimate that the cost of our participation in the
meeting in Berlin, Germany in June 2003 will be approximately $70,000. We have
also initiated one study designed to evaluate the actual effectiveness of the
OLpur(TM) MD190 when used on ESRD patients in western Europe. We initiated this
study in January 2003 by commencing the process of selecting patients to
participate in the study, and expect this first study to continue through the
first quarter of 2003. We intend to initiate a second study in the summer of
2003 and expect this second study to continue through the summer of 2004. We
intend for these studies to provide us with valuable information regarding the
efficacy of our product and an opportunity to introduce the OLpur(TM) MD190 to
medical institutions in western Europe. We estimate that the total cost of these
studies to us will be approximately $1.76 million dollars.

      A potential increase in managed care in the United States presents both a
challenge and an opportunity for us. While an increase in managed care may lead
to a reduction in product pricing, we believe that, as a result of increased
managed care, healthcare providers will focus on the following global costs: (1)
the total cost of hospitalizations or admissions and (2) the total cost of daily
medications required to sustain the ESRD patients. Based on a study by Locatelli
et al. published in Kidney International in 1999 and an article by Maduell et
al. published in Nephrology Dialysis Transplantation in 1999, the costs
associated with ESRD-related medical procedures including Carpal Tunnel Syndrome
surgery and medication for ESRD patients are reduced for hemodiafiltration
patients. Accordingly, even if managed care increases in the United States, we
believe our products will be attractive to health care providers if our products
can offer improved therapy at lower costs than competing products.

      As discussed above, we intend to market our products primarily to
healthcare providers such as hospitals, dialysis clinics, managed care
organizations, and nephrology physician groups. We intend to ship our products
to these potential customers with the assistance of the manufacturers of our
products. See "Risk Factors -- If we are not able to successfully commercialize
our products...." We are also in discussion with major medical device
manufacturers/providers in Japan and Central and South America regarding license
opportunities for our technology.

Research and Development

      Our research and development efforts continue on several fronts directly
related to our current product line. In particular, we are examining ways to
enhance further the removal of toxins from the blood by modifying certain blood
characteristics. We have applied, and will continue to apply, if and when
available, for U.S. Government grants in relation to this research, and will
apply for further grants as appropriate. We are also working on additional
machine devices, next-generation user interface enhancements and other product
enhancements. Our research and development expenditures were $957,616 for the
fiscal year ended December 31, 2002 and $737,858 for the fiscal year ended
December 31, 2001.

Clinical Testing

      We began clinical studies on the OLpur(TM) MD190 in Montpellier, France in
January 2003, under the supervision of Bernard Canaud, M.D., in Dr. Canaud's
capacity as president of L'institut de Recherche et de Formation en Dialyse, a
research institute located in Montpellier, France, by commencing the process of
selecting patients to participate in the studies. In September 2002, L'institut
de Recherche et de Formation en Dialyse agreed to provide us with Dr. Canaud's
services for supervising the clinical studies on our OLpur(TM) MD190, throughout
which Dr. Canaud shall, among other things, evaluate the efficacy of our
OLpur(TM) MD190 as compared to the efficacy of conventional dialyzers. We
anticipate that the clinical studies will be completed during the first quarter
of 2003.


                                       37


      Throughout 2003, we also intend to engage in additional clinical studies
across western Europe to demonstrate additional safety and benefits of our
products.

Competition

      The dialyzer and renal replacement therapy market is subject to intense
competition. Accordingly, our future success will depend on our ability to meet
the clinical needs of physicians and nephrologists, improve patient outcomes and
remain cost-effective for payors.

      We expect to compete with other suppliers of ESRD therapies, supplies and
services. These suppliers include Fresenius Medical Care AG, The Gambro Company
and Baxter International Inc., currently three of the primary machine
manufacturers in hemodialysis. At present, Fresenius and Gambro also manufacture
hemodiafiltration machines. These companies and a number of our other
competitors have substantially greater financial, scientific and technical
resources, research and development resources, marketing and manufacturing
resources and sales experience than we have and greater experience in developing
products, providing services and obtaining regulatory approvals.

      Some of our competitors, including Fresenius and Gambro, manufacture their
own products and own dialysis clinics in the United States, Europe and other
regions of the world. Because these competitors tend to use their own products,
we may not be able to successfully market our products to the dialysis clinics
under their ownership. According to the Merrill Report, approximately 95% of the
products then used by dialysis clinics owned by Fresenius were products of
Fresenius and approximately 40% of the products then used by dialysis clinics
owned by Gambro were products of Gambro. Based on the same report, and by our
calculations, we estimate that as of September 2001: (1) Fresenius treated in
its own dialysis clinics approximately 24.8% of the dialysis patients in the
United States, 4.6% of the dialysis patients in Europe and 8.5% of the dialysis
patients worldwide; and (2) Gambro treated in its own dialysis clinics
approximately 13.5% of the dialysis patients in the United States, 2.3% of the
dialysis patients in Europe and 4.5% of the dialysis patients worldwide. See
"Risk Factors -- We expect to face significant competition from existing
suppliers..."

      Other competitive considerations include pharmacological and technological
advances in preventing the progression of ESRD in high-risk patients such as
those with diabetes and hypertension, technological developments by others in
the area of dialysis, the development of new medications designed to reduce the
incidence of kidney transplant rejection and progress in using kidneys harvested
from genetically-engineered animals as a source of transplants. See "Risk
Factors -- If the size of the market for our products is significantly reduced
due to pharmacological or technological advances in preventative and alternative
treatments for ESRD..."

      We are not aware of any other companies using technology similar to ours
in the treatment of ESRD. Our competition would increase, however, if companies
that currently sell ESRD products, or new companies that enter the market,
develop technology that is more efficient than ours. Barriers to entry in our
industry include (1) a large investment in research and development; (2)
numerous costly and time-consuming regulatory hurdles to overcome before any
products can be marketed and sold; (3) high costs for marketing and for building
an effective distribution network, both of which are particularly difficult in a
market already dominated by a few well-established key players; and (4) the
ability to obtain financing during the entire start up period, which may be
difficult in the current financial environment.

      We believe that in order to become competitive, we will need to develop
and maintain competitive products and take and hold sufficient market share from
our competitors. Our methods of competition, therefore, include (1) continuing
our efforts to develop, have manufactured and sell products which, when compared
to existing products, perform more efficiently and are available at prices that
are acceptable to the market; (2) displaying our products and providing
associated literature at major industry trade shows in the United States and
Europe; (3) initiating discussions with dialysis clinic medical directors, as
well as representatives of dialysis clinical chains, to develop interest in our
products; and (4) pursuing alliance opportunities in Central and South America
and Asia for distribution of our products and possible alternative manufacturing
facilities.


                                       38


Intellectual Property

Patents

      We attempt to protect our technology and products through patents and
patent applications. In addition to the United States, we are also applying for
patents in other markets, such as Europe, Canada and Japan, to the extent we
deem appropriate. We have built a portfolio of patents and applications covering
our products, including their hardware design and methods of hemodiafiltration.

      We believe that our patent strategy will provide a competitive advantage
in our target markets, but our patents may not be broad enough to cover our
competitors' products and may be subject to invalidation claims. Our U.S. patent
for the "Method and Apparatus for Efficient Hemodiafiltration" and the pending
U.S. patent application for the "Dual Stage Filtration Cartridge," have claims
that cover the OLpur(TM) MD190 product and the method of hemodiafiltration
employed in the operation of the product. Although there are pending
applications with claims to the present embodiments of the OLpur(TM) H(2)H(TM)
and the OLpur(TM) NS2000 products, these products are still in the design stage
and we cannot determine if the applications (or the patents that may issue on
them) will also cover the ultimate commercial embodiment of these products. See
"Risk Factors - Protecting our intellectual property in our technology through
patents may be costly and ineffective..." In addition, technological
developments in ESRD therapy could reduce the value of our intellectual
property. Any such reduction could be rapid and unanticipated.

      As of the date of this prospectus, we have four issued U.S. patents, five
pending U.S. patent applications and seven pending International patent
applications designating all the Patent Cooperation Treaty member countries,
including the United States, covering proposed products and methods of using
such products. We have one additional invention under review by our patent
counsel and expect a patent application for this invention to be filed shortly.
The titles, patent numbers and normal expiration dates (assuming all the U.S.
Patent and Trademark Office fees are paid) of our four issued U.S. patents are
set forth in the chart below.



         Title                                                Patent Number                      Expiration Date
         -----                                                -------------                      ---------------
                                                                                           
         Method and Apparatus for
           Efficient Hemodiafiltration                        6,303,036                          July 30, 2019
         Two Stage Diafiltration Method and Apparatus         6,406,631                          July 30, 2019
         Non-Isosmotic Diafiltration System                   6,423,231                          October 29, 2019
         Dual Stage Hemodiafiltration Cartridge               6,315,895                          December 30, 2019


      For each of our U.S. patents identified above and for at least three of
our pending U.S. patent applications, we have also filed or plan to file,
counterpart patent applications in Japan, Canada and in certain member states of
the European Patent Convention. Our remaining patent applications are pending
and relate to a range of dialysis technologies, including cartridge
configurations, cartridge assembly, substitution fluid systems, and methods to
enhance toxin removal. For our international patent applications, the titles,
agencies or countries in which such applications were filed, serial numbers and
filing dates are set forth in the chart below.



     Title                                           Agency/Country               Serial No.             Filing Date
     -----                                           --------------               ----------             -----------
                                                                                                
     Method and Apparatus for Efficient              Canadian Patent Office       2,338,952              July 30, 1999
     Hemodiafiltration
                                                     European Patent Office       99943641.3             July 30, 1999
                                                     Japanese Patent Office       2000-562134            July 30, 1999

     Non-Isosmotic Diafiltration System              Canadian Patent Office       2,349,363              October 29, 1999
                                                     European Patent Office       99958752.0             October 29, 1999
                                                     Japanese Patent Office       2000-579334            October 29, 1999

     Method and Apparatus for Generating a Sterile   World Intellectual           PCT/US01/50719         October 19, 2001
     Infusion Fluid                                  Property Organization


                                       39




     Title                                           Agency/Country               Serial No.             Filing Date
     -----                                           --------------               ----------             -----------
                                                                                                
     Dual Stage Hemodiafiltration Cartridge          Canadian Patent Office       National Filing of
                                                                                  PCT/US00/35717         December 29, 2000
                                                     European Patent Office       00989637.4             December 29, 2000
                                                     Japanese Patent Office       2001-549759            December 29, 2000
     Sterile Fluid Filtration Cartridge and Method   Canadian Patent Office       National Filing of     December 29, 2000
     for Using Same                                                               PCT/US00/35716         December 29, 2000
                                                     European Patent Office       00990428.5             December 29, 2000
                                                     Japanese Patent Office       2001-549758
     Thermally Enhanced Dialysis/Diafiltration       Canadian Patent Office       National Filing of     January 11, 2001
     System                                                                       PCT/US01/01024         January 11, 2001
                                                     European Patent Office       01902018.9             January 11, 2001
     Title                                           Japanese Patent Office       2001-551599

     Ionic Enhanced Dialysis/Diafiltration System    Canadian Patent Office       National Filing of     January 11, 2001
                                                                                  PCT/US01/01023
                                                     European Patent Office       01902017.1             January 11, 2001
                                                     Japanese Patent Office       2001-551598            January 11, 2001

     Two Stage Diafiltration Method and Apparatus    World Intellectual           PCT/US01/45368         October 30, 2001
                                                     Property Organization

     Valve Mechanism for Infusion Fluid Systems      World Intellectual           PCT/US01/47211         December 7, 2001
                                                     Property Organization

     Dual Stage Filtration Cartridge                 World Intellectual           PCT/US01/45369         October 30, 2001
                                                     Property Organization
     Hemodiafiltration/Hemofiltration Method and
     Apparatus                                       World Intellectual           PCT/US01/50503         December 20, 2001
                                                     Property Organization

     Mid-Dilution Hemo/Dia-Filtration Cartridges     World Intellectual           PCT/US01/47541         December 11, 2001
     Method and Apparatus for a Hemodiafiltration    Property Organization
     Delivery Module                                 World Intellectual

                                                     Property Organization        PCT/US02/03741         February 7, 2002


Trademarks

      As of the date of this prospectus, we do not have any registered
trademarks. Centrapur,(TM) OLpur,(TM) and H(2)H(TM) are among our non-registered
trademarks, for which trademark registration applications are pending.

License Agreement

      On November 1, 1999, we entered into a license agreement with the Trustees
of Columbia University in the City of New York, pursuant to which Columbia
granted us an exclusive right to develop, manufacture, use, sell or lease
products or services covered by certain patent applications or the patents that
may be granted on such applications, collectively referred to in this paragraph
as the "licensed patents." As consideration for this license, we made an initial
payment of $2,500 in cash and issued 2,136 shares of our common stock and are
required to pay to Columbia royalties of 0.33% on leases, rentals, net sales or
transfers of all products or services covered by the licensed patents and 0.33%
of all lump-sum payments we receive in connection with the sale or transfer of
rights in the licensed patents, or in the products or services covered by the
licensed patents. In addition, we are required to make the following payments to
Columbia if we meet the following milestones: (1) $2,500 in cash upon the filing
of the first Nephros-sponsored pre-market application or a foreign equivalent
for the products or services covered by the licensed patents, with the FDA, or
its foreign equivalent; (2) $50,000 upon the cumulative net sales or transfers
of $25,000,000 of products or services covered by the licensed patents; and (3)
$125,000 upon the cumulative net sales or transfers of $200,000,000 of products
or services covered by the licensed patents. As of December 31, 2002, we had not
met any of these milestones. The exclusive license granted under this license
agreement extends until the later to occur of (1)


                                       40


expiration of the last to expire of the licensed patents or (2) ten years from
the date of first sale of a product or service covered by the licensed patents.
Since neither of these events has occurred, the license agreement is currently
in effect. Although the license agreement is in effect, we do not anticipate
making any further payments under the license agreement as we have discontinued
the development of any products covered by the licensed patents.

Settlement Agreements

      In June 2002 we entered into a settlement agreement with Plexus Services
Corp., a supplier of engineering consulting services, with respect to a claim
for payment by us to Plexus of approximately $1,900,000 for engineering
consulting services relating to the research and development of our OLpur(TM)
NS2000. Pursuant to this settlement agreement, Plexus agreed to release us from
liability with respect to its claim in exchange for (1) our issuance to Plexus
of warrants to purchase 134,899 shares of our common stock at an exercise price
of $13.34 per share which expire in June 2007; and (2) our payment to Plexus of
an aggregate amount of $650,000 in three installments. We paid the first
installment of $300,000 in August 2002. The second installment of $100,000 was
due on February 7, 2003; however, Plexus has consented to extend the date for
its receipt of payment of this installment to the date on which the third
installment is due. The third installment of $250,000 is due when we raise
$1,250,000 of additional capital. We will be released from all liability with
respect to the claim and the project once all payments required under this
settlement agreement are made. We also agreed to release each other from any and
all other claims or liabilities that we had against the other as of the date of
the settlement agreement.

      In August 2002, we entered into a subscription agreement with Lancer
Offshore, Inc. The subscription agreement provided that Lancer Offshore, Inc.
would purchase, in three installments, (1) $3,000,000 principal amount of
secured notes due March 15, 2003 convertible into 1,200,000 shares of our common
stock and (2) warrants to purchase until December 2007 an aggregate of 240,000
shares of our common stock at an exercise price of $2.50 per share. In
accordance with the subscription agreement, the first installment of securities,
consisting of $1,500,000 principal amount of the notes and 120,000 of the
warrants, was sold. However, Lancer Offshore, Inc. did not fund the remaining
installments. We have entered into a settlement agreement with Lancer Offshore,
Inc. dated as of January 31, 2003, pursuant to which, among other things, (1)
the parties gave mutual releases relating to the subscription agreement, (2)
Lancer Offshore, Inc. agreed to surrender to us all of its warrants except a
portion thereof exercisable to purchase 75,000 shares of common stock, and (3)
Lancer Offshore, Inc. agreed to exchange the secured convertible note referred
to above for an unsecured note in the same principal amount bearing no interest,
not convertible into common stock, and due on the earlier to occur of (i)
January 31, 2004 and (ii) seven business days after we receive the net proceeds
of this offering.

      In April 2002, we entered into a letter agreement with Hermitage Capital
Corporation which, among other things, required us to provide Hermitage Capital
Corporation with (1) a placement fee of 10% of the total amount of funds raised
during the term of the letter agreement from investors introduced by Hermitage
Capital Corporation in a financing through the issuance and placement of certain
of our equity or convertible debt securities, (2) warrants to purchase an amount
of shares of our common stock equal to 4.166% of any such financing and (3) a
placement fee of 10% of the total amount of funds raised in any such financing
successfully consummated during the three years immediately following the term
of the letter agreement with an investor that was introduced to us by Hermitage
Capital Corporation during the term of the letter agreement. The stated term of
the letter agreement was from April 30, 2002 through September 30, 2004.
Pursuant to the terms of the letter agreement, we paid Hermitage Capital
Corporation, as placement agent, an aggregate amount of $150,000 in connection
with our transactions with Lancer Offshore, Inc. in August 2002. We have entered
into a settlement agreement with Hermitage Capital Corporation dated as of
February 13, 2003 pursuant to which, among other things, (1) the letter
agreement was terminated, (2) the parties gave mutual releases relating to the
letter agreement and (3) we agreed to issue to Hermitage Capital Corporation or
its designees, upon the completion of the transactions comtemplated by the
settlement agreement with Lancer, warrants exercisable until February 2006 to
purchase an aggregate of 60,000 shares of our common stock at an exercise price
of $2.50 per share.

Governmental Regulation

      The research and development, manufacturing, promotion, marketing and
distribution of our products in the United States, Europe and other regions of
the world are subject to regulation by numerous governmental authorities,
including the U.S. Food and Drug Administration, or the FDA, the European Union
and corresponding foreign agencies.


                                       41


Food and Drug Administration

      The FDA regulates the manufacture and distribution of medical devices in
the United States pursuant to the Food, Drug and Cosmetic Act of 1938, or the
FDC Act. All of our products are regulated in the United States as medical
devices by the FDA under the FDA Act. Noncompliance with applicable requirements
can result in, among other things, (1) fines, (2) injunctions, (3) civil
penalties, (4) recall or seizure of products, (5) total or partial suspension of
production, (6) withdrawal of existing approvals or premarket clearances of our
products, (7) refusal to approve or clear new applications or notices relating
to our products, (8) recommendations by the FDA that we not be allowed to enter
into government contracts and (9) criminal prosecution. The FDA also has
authority to require repair, replacement or refund of the cost of any device
illegally manufactured or distributed by us.

      Under the FDC Act, medical devices are classified in one of three classes,
Class I, II or III, on the basis of the controls deemed necessary by the FDA to
reasonably ensure their safety and effectiveness.


            o     Class I devices are medical devices for which general controls
                  are deemed sufficient to ensure their safety and
                  effectiveness. General controls include provisions related to
                  (1) labeling, (2) producer registration, (3) defect
                  notification, (4) records and reports and (5) quality service
                  requirements, or QSR.

            o     Class II devices are medical devices for which the general
                  controls for the Class I devices are deemed not sufficient to
                  ensure their safety and effectiveness and require special
                  controls in addition to the general controls. Special controls
                  include provisions related to (1) performance and design
                  standards, (2) post-market surveillance, (3) patient
                  registries and (4) the use of FDA guidelines.

            o     Class III devices are medical devices generally limited to
                  life-sustaining, life-supporting or implantable devices or new
                  devices which have been found not to be substantially
                  equivalent to legally marketed devices, that the FDA deems to
                  require the most restrictive controls to ensure their safety
                  and effectiveness.

      Before a new medical device can be introduced to the market, FDA clearance
of a premarket notification under Section 510(k) of the FDC Act or FDA clearance
of a premarket approval application under Section 515 of the FDC Act must be
obtained. A Section 510(k) clearance will be granted if the submitted
information establishes that the proposed device is "substantially equivalent"
to a legally marketed Class I or Class II medical device or to a Class III
medical device for which the FDA has not called for premarket approval under
Section 515. The Section 510(k) premarket clearance process is generally faster
and simpler than the Section 515 premarket approval process. We understand that
it generally takes three to 12 months from the date a Section 510(k)
notification is accepted for filing to obtain Section 510(k) premarket clearance
and that it may take several years from the date a Section 515 application is
accepted for filing to obtain Section 515 premarket approval, although it may
take longer in both cases.

      We expect that all of our products will be categorized as Class II devices
and that these products will not require clearance of premarket approval
applications under Section 515 of the FDC Act, but will be eligible for
marketing clearance through the premarket notification process under Section
510(k). We have determined that we are eligible to utilize the Section 510(k)
premarket notification process based upon our products' substantial equivalence
to previously legally marketed devices in the United States. We cannot assure
you, however, that (1) we will not need to reevaluate the applicability of the
Section 510(k) premarket notification process to our products in the future, (2)
the FDA will agree with our determination that we are eligible to use the
Section 510(k) premarket notification process, or (3) the FDA will not in the
future require us to submit a Section 515 premarket approval application, which
would be a more costly, lengthy and uncertain approval process.

      The FDA has recently been requiring a more rigorous demonstration of
substantial equivalence than in the past and may request clinical data to
support premarket clearance. As a result, the FDA could refuse to accept for
filing a Section 510(k) notification made by us pending the submission of
additional information. The FDA may determine that any one of our proposed
products is not substantially equivalent to a legally marketed device or that
additional information is needed before a substantial equivalence determination
can be made. A "not substantially equivalent" determination, or request for
additional data, can prevent or delay the market introduction of our products
that fall into this category. Such a determination or request regarding any of
our products could have a material adverse effect on our business, financial
condition and results of operations. Even if the FDA does clear one or all of
our products under Section 510(k) process, it may clear a product for some
procedures but not others or for certain classes of patients and not others.


                                       42


      For any devices cleared through the Section 510(k) process, modifications
or enhancements that could significantly affect the safety or effectiveness of
the device or that constitute a major change to the intended use of the device
will require a new Section 510(k) premarket notification submission.
Accordingly, if we do obtain Section 510(k) premarket clearance for any of our
products, we will need to submit another Section 510(k) premarket notification
if we significantly affect that product's safety or effectiveness through
subsequent modifications or enhancements.

      If human clinical trials of a device are required in connection with a
Section 510(k) notification and the device presents a "significant risk," the
sponsor of the trial (usually the manufacturer or distributor of the device)
will need to file an Investigational Device Exemption, or IDE, application prior
to commencing human clinical trials. The IDE application must be supported by
data, typically including the results of animal testing and/or laboratory bench
testing. If the IDE application is approved, human clinical trials may begin at
a specific number of investigational sites with a specific number of patients,
as specified in the IDE. Sponsors of clinical trials are permitted to sell those
devices distributed in the course of the study provided such compensation does
not exceed recovery of the costs of manufacture, research, development and
handling. An IDE supplement must be submitted to the FDA before a sponsor or
investigator may make a change to the investigational plan that may affect its
scientific soundness or the rights, safety or welfare of subjects. We intend to
file an IDE with respect to the OLpur(TM) MD190 and the OLpur(TM) H(2)H(TM), and
an IDE with respect to the OLpur(TM) NS2000. As of the date of this prospectus,
we have filed a pre-IDE application with respect to the OLpur(TM) MD190 and the
OLpur(TM) H(2)H(TM) and have initiated discussions with the FDA to facilitate
the 510(k) approval process.

      The Section 510(k) premarket clearance process can be lengthy and
uncertain. It will require substantial commitments of our financial resources
and management's time and effort. Significant delays in this process could occur
as a result of (1) the FDA's failure to schedule advisory review panels, (2)
changes in established review guidelines, (3) changes in regulations or
administrative interpretations or (4) determinations by the FDA that clinical
data collected is insufficient to support the safety and effectiveness of one or
more of our products for their intended uses or that the data warrants the
continuation of clinical studies. Delays in obtaining, or failure to obtain,
requisite regulatory approvals or clearances in the United States for any of our
products would prevent us from selling those products in the United States and
would impair our ability to generate funds from sales of those products in the
United States, which in turn could have a material adverse effect on our
business, financial condition, and results of operations. See "Risk Factors-- We
cannot sell our products until we obtain the requisite regulatory approvals and
clearances..."

      The FDC Act requires that medical devices be manufactured in accordance
with the FDA's current quality service requirements, or QSR, regulations. These
regulations require, among other things, that:

      o     the design and manufacturing processes be regulated and controlled
            by the use of written procedures;

      o     the ability to produce medical devices which meet the manufacturer's
            specifications be validated by extensive and detailed testing of
            every aspect of the process;

      o     any deficiencies in the manufacturing process or in the products
            produced be investigated;

      o     detailed records be kept and a corrective and preventative action
            plan be in place; and

      o     manufacturing facilities be subject to FDA inspection on a periodic
            basis to monitor compliance with QSR requirements.

If violations of the applicable QSR regulations are noted during FDA inspections
of our manufacturing facilities or the manufacturing facilities of our contract
manufacturers, there may be a material adverse effect on our ability to produce
and sell our products.

      Before the FDA approves a Section 510(k) premarket notification, the FDA
is likely to inspect the utilized manufacturing facilities and processes to
ensure their continued compliance with QSR. Although some of the manufacturing
facilities and processes that we expect to use to manufacture our OLpur(TM)
MD190 have been inspected by TUV Product Service (Munich), they have not been
inspected by the FDA. Similarly, although some of the facilities and processes
that we expect to use to manufacture our OLpur(TM) H(2)H(TM) and OLpur(TM)
NS2000 have been inspected by the FDA, they have not been inspected by any TUV
organization. Even after the FDA has cleared a Section 510(k) submission, it
will periodically inspect the manufacturing facilities and processes for
compliance with QSR. In addition, in the event that additional manufacturing
sites are added or manufacturing processes are changed, such new facilities and
processes are also subject to FDA inspection for

                                       43


compliance with QSR. The manufacturing facilities and processes that will be
used to manufacture our products have not yet been inspected by the FDA for
compliance with QSR. We cannot assure you that the facilities and processes
utilized by us will remain in compliance with QSR and there is a risk that
clearance or approval will, therefore, be delayed by the FDA until such
compliance is achieved.

      In addition to the requirements described above, the FDC Act requires
that:

      o     All medical device manufacturers and distributors register with the
            FDA annually and provide the FDA with a list of those medical
            devices which they distribute commercially.

      o     Information be provided to the FDA on death or serious injuries
            alleged to have been associated with the use of the products, as
            well as product malfunctions that would likely cause or contribute
            to death or serious injury if the malfunction were to recur.

      o     Certain medical devices not cleared with the FDA for marketing in
            the United States meet specific requirements before they are
            exported.

European Union

      The European Union began to harmonize national regulations comprehensively
for the control of medical devices in Europe in 1993, when it adopted its
Medical Devices Directive. The European Union directive applies to both the
manufacturer's quality control system and the product's technical design.
Depending on the class of medical devices, a manufacturer may choose alternative
regulatory approaches to demonstrate compliance with European Union provisions.
To assure and demonstrate the high quality standards and performance of our
operations, we have subjected our entire European business to the most
comprehensive procedural approach, which is also the fastest way to launch a new
product in the European Union.

      The regulatory approach we have chosen to demonstrate compliance with
European Union provisions requires the certification of a full quality
management system by a "notified body" charged with examining the quality
management system. A "notified body" is a group accredited and monitored by
governmental agencies that inspects manufacturing facilities and quality control
systems at regular intervals and is authorized to carry out unannounced
inspections. We have engaged TUV Rheinland of North America, Inc. as the
notified body to assist us in obtaining a European Union certificate for the
quality management system of the facilities we expect to use to manufacture our
products and in demonstrating our compliance with the European Union
requirements. As of the date of this prospectus, some, but not all, of the
manufacturing facilities and processes that we expect to use to manufacture our
OLpur(TM) MD190 have been inspected by TUV Product Service (Munich).

      Under the regulatory approach we have chosen to demonstrate compliance
with European Union provisions, only after a company receives a European Union
certificate for the quality management system of a particular facility may the
company assess whether products developed and manufactured in the facility
satisfy European Union requirements. European Union requirements for products
are set forth in harmonized European Union standards and include conformity to
safety requirements, physical and biological properties, construction and
environmental properties, and information supplied by the manufacturer. A
company demonstrates conformity to these requirements by pre-clinical tests,
biocompatibility tests, qualification of products and packaging, risk analysis
and well-conducted clinical investigations approved by ethics committees.

      Once a manufacturer having a European Union-certified full quality
management system has assessed the conformity of its products with harmonized
European standards and has determined that its products conform with these
standards, the manufacturer then declares and documents such conformity and
places a "CE" mark on the relevant products. The CE mark, which stands for
Conformite Europeenne, demonstrates compliance with the relevant European Union
requirements. Products subject to these provisions that do not bear the CE mark
cannot be imported to, or sold or distributed within, the European Union.

Regulatory Authorities in Regions outside of the United States and Europe

      We also plan to sell our products in foreign markets outside the United
States which are not part of the European Union. Requirements pertaining to
medical devices vary widely from country to country, ranging from no health
regulations to detailed submissions such as those required by the FDA. We
believe the extent and complexity of regulations for medical devices such


                                       44


as those produced by us are increasing worldwide. We anticipate that this trend
will continue and that the cost and time required to obtain approval to market
in any given country will increase, with no assurance that such approval will be
obtained. Our ability to export into other countries may require compliance with
ISO 9000, which is analogous to compliance with the FDA's QSR requirements. We
have not obtained any regulatory approvals to sell any of our products outside
of the United States and there is no assurance that any such clearance or
certification will be issued.

Reimbursement

      In both domestic markets and markets outside of the United States, sales
of our products will depend in part, on the availability of reimbursement from
third-party payors. In the United States, ESRD providers are reimbursed through
Medicare and Medicaid and private insurers. In countries other than the United
States, ESRD providers are also reimbursed through governmental and private
insurers. In countries other than the United States, the pricing and
profitability of our products generally will be subject to government controls.
Despite the continually expanding influence of the European Union, national
healthcare systems in Europe, reimbursement decision-making included, are
neither regulated nor integrated at the European level. Each country has its own
system, often closely protected by its corresponding national government.

Medicare Reimbursement

      Medicare generally provides health insurance coverage for persons who are
age 65 or older and for persons who are completely disabled. Medicare also
provides coverage for other eligible patients, regardless of age, who have been
medically determined to have ESRD. For patients eligible for Medicare based
solely on ESRD (generally patients under age 65), Medicare eligibility begins
three months after the month in which the patient begins dialysis. During this
three-month waiting period, Medicaid, private insurance or the patient is
responsible for payment for dialysis services. This waiting period is waived for
individuals who participate in a self-care dialysis-training program.

      For ESRD patients under age 65 who have any employer group health
insurance coverage (regardless of the size of the employer or the individual's
employment status), Medicare coverage is generally secondary to the employer
coverage during a 30-month coordination period that follows the establishment of
Medicare eligibility or entitlement based on ESRD. During the coordination
period, an employer group health plan is responsible for paying primary benefits
at the rate specified in the plan, which may be a negotiated rate or the
healthcare provider's usual and customary rate. As the secondary payer during
this coordination period, Medicare will make payments up to the applicable
composite rate for dialysis services to supplement any primary payments by the
employer group health plan if the plan covers the services but pays only a
portion of the charge for the services.

      Medicare generally is the primary payer for ESRD patients after the
30-month coordination period. Under current rules, Medicare is also the primary
payer for ESRD patients during the 30-month coordination period if, before
becoming eligible for Medicare on the basis of ESRD, the patient was already age
65 or over (or eligible for Medicare based on disability) unless covered by an
employer group health plan (other than a "small" employer plan) because of
current employment. This rule eliminates for many dual-eligible beneficiaries
the 30-month coordination period during which the employer plan would serve as
primary payer and reimburse health care providers at a rate that we believe may
be higher than the Medicare composite rate. The rule regarding entitlement to
primary Medicare coverage when the patient is eligible for Medicare on the basis
of both age (or disability) and ESRD has been the subject of frequent
legislative and regulatory change in recent years and there can be no assurance
that the rule will remain unchanged in the future.

      When Medicare is the primary payer, it reimburses 80% of the composite
rate set by the Medicare prospective reimbursement system for each dialysis
treatment. The beneficiary is responsible for the remaining 20%, as well as any
unmet Medicare deductible amount, although an approved Medicare supplement
insurance policy, other private health insurance or Medicaid may pay on the
beneficiary's behalf. The composite payment rates, effective January 1, 2002,
for urban renal facilities published in February 2001 by the Department of
Health and Human Services for outpatient dialysis services ranged from $121.24
to $144.50 per treatment depending on the location of the renal facility.
Reimbursement rates are subject to periodic adjustment based on certain factors,
including legislation and executive and congressional budget reduction and
control processes, inflation and costs incurred in rendering the services, but
in the past have had little relationship to the cost of conducting business.

      We are unable to predict what, if any, future changes may occur in the
Medicare composite reimbursement rate. or in any other reimbursement


                                       45


program. Any reductions in the Medicare composite reimbursement rate or in any
other reimbursement program could have a material adverse effect on our revenues
and net earnings. In addition, there have been various legislative proposals for
the reform of numerous aspects of Medicare, including extension of the
coordination period and expanded enrollment of Medicare beneficiaries in managed
care programs. See "--Potential Health Care Legislation."

Private Reimbursement

      Some ESRD patients have private insurance that covers dialysis services.
As discussed above, health care providers receive reimbursement for ESRD
treatments from the patient or private insurance during a "waiting period" of up
to three months before the patient becomes eligible for Medicare. In addition,
if the private payer is an employer group health plan, it is generally required
to continue to make primary payments for dialysis services during the 30-month
period following eligibility or entitlement to Medicare. In general, employers
may not reduce coverage or otherwise discriminate against ESRD patients by
taking into account the patient's eligibility or entitlement to Medicare
benefits.

      We believe that before Medicare primary coverage is established, private
payers may reimburse dialysis expenses at rates significantly higher than
compensation under the Medicare composite rate on a per-treatment basis. When
Medicare becomes a patient's primary payer, private insurance often covers the
per-treatment 20% coinsurance that Medicare does not pay.

Medicaid

      Reimbursement Medicaid programs are state-administered programs partially
funded by the federal government. These programs are intended to provide
coverage for patients whose income and assets fall below state defined levels
and who are otherwise uninsured. The programs may also serve as supplemental
insurance programs for the Medicare co-insurance portion and provide certain
coverages (e.g., oral medications) that are not covered by Medicare. Some
Medicaid programs require Medicare recipients to pay a share of the cost of
services based upon the recipient's level of income or assets, but other
programs provide for coverage without coinsurance amounts.

Potential Health Care Legislation

      Because the Medicare program represents a substantial portion of the
federal budget, Congress takes action in almost every legislative session to
modify the Medicare program for the purpose of reducing the amounts otherwise
payable by the program to health care providers in order to achieve deficit
reduction targets or meet other political goals. Legislation and/or regulations
may be enacted in the future that may significantly modify the Medicare ESRD
program or substantially affect reimbursement for dialysis services.

Product Liability and Insurance

      The production, marketing and sale of kidney dialysis products have an
inherent risk of liability in the event of product failure or claim of harm
caused by product operation. Although we intend to acquire product liability
insurance upon commercialization of each of our products, we may not be able to
obtain this insurance on acceptable terms or at all. Because we may not be able
to obtain insurance that provides us with adequate protection against all
potential product liability claims, a successful claim in excess of our
insurance coverage could materially adversely affect our financial condition.
Moreover, any claim against us could generate negative publicity, which could
decrease the demand for our products, our ability to generate revenues and our
profitability.

      Some of the agreements that we may enter into with manufacturers of our
products and components of our products may require us (1) to obtain product
liability insurance or (2) indemnify manufacturers against liabilities resulting
from the sale of our products. If we are not able to obtain and maintain
adequate product liability insurance, we will be in breach of these agreements,
which could materially adversely affect our ability to produce our products. If
we are able to obtain and maintain product liability insurance and a successful
claim in excess of our insurance coverage is made, we may have to indemnify some
or all of our manufacturers for their losses. This would materially adversely
affect our results of operations and financial condition. See "Risk Factors --
If we are not able to obtain adequate insurance or other protection against
product liability risks..."


                                       46



Employees

      As of December 31, 2002, we employed a total of eleven employees, eight of
which were full time and three of which were on a consulting basis or part-time.
Of these employees, five were in research and development, three were in
marketing and sales and three were in general and administrative functions.

      We intend to add four to six members to our sales staff in each of Europe
and the United States, as well as three to four members to our administrative
staff in Europe. We intend to make our European staff additions at or around the
time we obtain regulatory approval of the OLpur(TM) MD190 in the European Union,
which we have targeted for the spring of 2003. We intend to make our U.S. staff
additions at or around the time we obtain regulatory approval for the OLpur(TM)
MD190 in the United States, which we have targeted for the spring of 2004.

      No employees are covered by collective bargaining agreements. We consider
our relationship with our employees generally to be good.

Facilities

      Our facilities are located at 3960 Broadway, 4th Floor, New York, New York
10032 and consist of approximately 2,100 square feet of space. On July 1, 2002,
we entered into a lease for this space with the Trustees of Columbia University
in the City of New York. The term of the lease is for one year with a monthly
rent of $6,116.01, including a monthly internet access fee of $256.25.

      We use our facilities to house our corporate headquarters and research
facilities. Our offices and laboratories are housed in the Mary Woodard Lasker
Building, a part of the Audubon Business and Technology Center administered by
Columbia University, which is equipped to accommodate biotechnology and medical
product development companies. Of the space we lease, 1,500 square feet is
dedicated laboratory space, which is equipped with laboratory equipment,
including laboratory benches, fume hoods, gas, air and water suction systems,
and the remaining 600 square feet is dedicated office space.

      We believe that our existing facilities are suitable as laboratory space
and office space and are adequate to meet our current U.S. requirements. We also
believe that our insurance coverage adequately covers our interest in our leased
space. We intend to lease space in Europe for sales and marketing offices.

      We do not own any real property for use in our operations or otherwise.

Legal Proceedings

      There are no current or pending legal proceedings to which we are a party
or to which any of our properties is subject.


                                       47


                                   MANAGEMENT

Information Concerning Directors, Executive Officers and Key Employees

Directors and Executive Officers.

      The following table sets forth information regarding our directors and
executive officers:

      Name                       Age   Position
      -----------------------------------------------------------------------
      Eric A. Rose, M.D.         51    Chairman of the Board and Director
      Norman J. Barta            46    President, Chief Executive Officer,
                                       Chief Financial Officer and Director
      Lawrence J. Centella       61    Director
      Howard Davis               47    Director
      Donald G. Drapkin          54    Director
      William J. Fox             46    Director
      W. Townsend Ziebold, Jr.   41    Director

- ----------

      Eric A. Rose, M.D. has served as chairman of our board of directors and a
director since our inception in 1997. Dr. Rose served as our president and chief
executive officer from May 1999 until July 2002. Since 1994, Dr. Rose has been
the Morris and Rose Millstein/Johnson & Johnson Professor and Chairman of the
Department of Surgery at the Columbia University College of Physicians and
Surgeons, and Surgeon in Chief at the Columbia Presbyterian Medical Center. Dr.
Rose is a director of SIGA Technologies, Inc. Dr. Rose received a B.A., summa
cum laude, in Psychology from Columbia College and an M.D. from Columbia
University College of Physicians and Surgeons.

      Norman J. Barta has served as our president and chief executive officer
and as a director since July 2002, and has served as our chief financial officer
since October 1998. Mr. Barta served as our chief operating officer from October
1999 to July 2002 and our treasurer and secretary from May 1999 to October 1999.
From 1994 to 1997, Mr. Barta provided financial planning and management for the
research and development division of National Medical Care (currently a division
of the Fresenius Medical Care AG), which prior to its acquisition by Fresenius,
was one of the largest dialysis providers in the world. Prior to that, Mr. Barta
was a consultant for Corestates Bank, where he restructured and optimized cash
management and treasury areas for the bank's corporate and public-sector
clients. Neither National Medicare nor Fresenius is an "affiliate" of ours
within the meaning of Rule 405 under the Securities Act. Mr. Barta received a
B.S. in Mathematics and Economics from Carnegie-Mellon University and an M.B.A.
from the University of Chicago.

      Lawrence J. Centella has served as a director of our company since January
2001. Mr. Centella serves as president of Renal Patient Services, LLC, a company
that owns and operates dialysis centers, and has served in such capacity since
June 1998. From 1997 to 1998, Mr. Centella served as executive vice president
and chief operating officer of Gambro Healthcare, Inc., an integrated dialysis
company that manufactures dialysis equipment, supplies dialysis equipment and
operates dialysis clinics. From 1993 to 1997, Mr. Centella served as president
and chief executive officer of Gambro Healthcare Patient Services, Inc.
(formerly REN Corporation). Prior to that, Mr. Centella served as president of
COBE Renal Care, Inc., Gambro Hospal, Inc., LADA International, Inc. and Gambro,
Inc. Neither Gambro Healthcare, Inc. nor Gambro Healthcare Patient Services,
Inc. is an "affiliate" of ours within the meaning of Rule 405 under the
Securities Act. Mr. Centella is also the founder of LADA International, Inc. Mr.
Centella received a B.S. in Marketing from DePaul University.

      Howard Davis will begin to serve as a director of our company upon the
consummation of this offering. Since 1997, Mr. Davis has served as the executive
vice president of GunnAllen Financial Inc., one of the underwriters of this
offering, where he is the executive responsible for the investment banking and
finance division. Mr. Davis has advised us that he will not be involved with the
marketing of our securities after the consummation of this offering. From 1990
to 1997, Mr. Davis served as the president and chief executive officer of
Kensington Securities, Inc., a National Association of Securities Dealers, Inc.
broker dealer. Prior to joining Kensington Securities, Inc. in 1990, Mr. Davis
had served as the president, and, prior to that, as chief financial officer, of
Numero Uno Franchise Corporation, a Los Angeles based franchisor of pizzeria and
Italian restaurants. Mr. Davis is also a former instructor at California State
University. Mr. Davis currently serves as member of the board of directors and
the audit and compensation committees of Intellicheck, Inc., a corporation which
files reports pursuant to the Securities Exchange Act of 1934. Mr. Davis
attended the University of Southern California; California State University,
Northridge; and Kent State University, where he majored in Finance and
Accounting.


                                       48


      Donald G. Drapkin has served as a director of our company since our
inception in 1997. Mr. Drapkin served as our interim president, chief executive
officer and treasurer from 1997 until May 1999. Mr. Drapkin has been a director
and vice chairman of MacAndrews & Forbes Holdings Inc. and various of its
affiliates since 1987, including, as of the date of this prospectus, the
following corporations which file reports pursuant to the Securities Exchange
Act of 1934: Panavision Inc., Revlon Consumer Products Corporation and Revlon,
Inc. MacAndrews & Forbes Holdings Inc. is a holding company which has no
business operations of its own; it holds investments in various businesses from
time to time. Prior to joining MacAndrews & Forbes, Mr. Drapkin was a partner in
the law firm of Skadden, Arps, Slate, Meagher & Flom LLP for more than five
years. In addition to those listed above, Mr. Drapkin is a director of the
following corporations which file reports pursuant to the Securities Exchange
Act of 1934: Anthracite Capital, Inc.; Black Rock Asset Investors; The Molson
Companies Limited; Playboy Enterprises, Inc.; Playboy.com, Inc.; SIGA
Technologies, Inc. and The Warnaco Group, Inc. Mr. Drapkin received a B.A. from
Brandeis University and a J.D. from Columbia University.

      William J. Fox will begin to serve as a director of our company upon the
consummation of this offering. Since February 1999, Mr. Fox has served as
chairman, president and chief executive officer of AKI, Inc. and president,
chief executive officer and a director of AKI Holdings, Inc., a marketing and
interactive advertising company. Prior to that, Mr. Fox served as president of
Strategic and Corporate Development for Revlon Worldwide and chief executive
officer of Revlon Technologies. From 1994 to April 1999, Mr. Fox served as a
director, and from 1997 to 1999, Mr. Fox served as senior executive vice
president, of both Revlon Inc. and Revlon Consumer Products Corporation. For the
five years ending 1999, Mr. Fox was also senior vice president of MacAndrews &
Forbes Holdings, Inc. Mr. Fox currently serves as co-chairman of the board and a
director of Loehmann's Holding Inc. and has served as a vice-chairman of the
board and a director of Hain Food Group, Inc. and as a vice president, a
vice-chairman of the board and a director of The Cosmetic Centers, Inc., a
corporation which filed a voluntary bankruptcy petition in April 1999.

      W. Townsend Ziebold, Jr. has served as a director of our company since
1999. Mr. Ziebold was elected as a director of our company by the holders of
shares of our series B convertible preferred stock in accordance with certain
voting rights that terminate upon the mandatory conversion of such shares into
shares of our common stock upon the consummation of this offering. The shares of
our series B convertible preferred stock are beneficially owned by Cypress
Capital Assets, L.P., a beneficial holder of more than 5% of our common stock of
which Wasserstein & Co., L.P. is a limited partner. Since 1996, Mr. Ziebold has
been senior partner and president of Wasserstein Ventures, the venture capital
affiliate of Wasserstein & Co., L.P., where Mr. Ziebold has led several of
Wasserstein & Co., L.P.'s investments. Mr. Ziebold is also a director and
non-executive chairman of Imax Corporation, a leading large-screen film
projection company, and a former director of Collins & Aikman Corporation, a $2
billion sales diversified manufacturing company, and Maybelline, Inc., a leading
mass market cosmetics manufacturer. Mr. Ziebold currently serves as a member of
the Board of Fellows of Trinity College and as President of the Board of
Trustees at West Side Montessori School in New York City. Mr. Ziebold received a
B.A. in Economics from Trinity College and an M.B.A. from the Stanford School of
Business.

      There are no family relationships among any of our directors and executive
officers.

      Our board of directors currently consists of seven members. Our amended
and restated certificate of incorporation provides for a classified board of
directors consisting of three classes of directors, each serving staggered,
three-year terms. Except as otherwise provided by our bylaws for filling
vacancies on our board of directors, a portion of our board of directors will be
elected each year at our annual meeting of stockholders and hold office until
their respective successors are elected, or until their earlier resignation or
removal. The underwriters of this offering have the right to designate an
individual as a non-voting advisor to our board of directors who will be
entitled to attend any or all of the meetings of our board of directors and to
receive all information provided to our directors.

Key Employees

      Gregory Collins, Ph.D. has served as our senior scientist since 1998. From
1993 to 1997, Dr. Collins was a research and development program manager at
National Medical Care, where he was responsible for research and development
projects relating to dialyzer cartridges and bloodlines. From 1990 to 1993, Dr.
Collins served as a senior level research and development engineer at National
Medical Care, where he applied basic scientific theory to practical device
development using his training in solute transport, and gained technical
expertise in the spinning of hollow fiber semi-permeable membranes, dialyzer
cartridge design and assembly techniques, and novel test method development. Dr.
Collins received a B.S., summa cum laude, in


                                       49


Chemical Engineering from Arizona State University and a Ph.D., magna cum laude,
in Bioengineering from U.C. San Diego. Dr. Collins is 42 years old.

      Bruce W. Crook has served as our vice president-marketing and sales since
June 2002. From 1998 to 2002, Mr. Crook worked as an independent marketing
consultant for a variety of medical device companies. From 1996 to 1998, Mr.
Crook owned and was involved in the management of approximately 8 dialysis
clinics throughout the United States and Puerto Rico. From 1987 to 1996, Mr.
Crook held several senior positions at Fresenius Medical Care AG, including the
position of vice president of sales and director of marketing. Mr. Crook
received a B.S. in Business Administration from Arizona State University. Mr.
Crook is 47 years old.

      As of the date of this prospectus, we do not have an employment agreement
with either of these persons.

Board Committees

      Upon the consummation of this offering, our compensation committee will
consist of two members, Eric A. Rose, M.D. and Howard Davis, each of whom is an
independent director. The compensation committee will be responsible for
establishing executive officers' compensation and fringe benefits. It will also
administer our Nephros 2000 Stock Incentive Plan and will be authorized to grant
options under this plan.

      Upon the consummation of this offering, our audit committee will consist
of three members, Lawrence J. Centella, Howard Davis and William J. Fox, each of
whom is an independent director. The audit committee will recommend the
appointment of independent accountants and will review and discuss with the
accountants the scope of their examination, their proposed fee and the overall
approach to the audit. The audit committee will review with the accountants and
our financial management the annual financial statements and discuss the
effectiveness of internal accounting controls.

Director Compensation

      We will pay our directors $500 per meeting for board meetings attended in
person and $100 per meeting for board meetings attended telephonically and will
reimburse our directors for expenses incurred by them in connection with serving
on our board of directors. We will pay the chairman of the Audit Committee $500
per meeting for meetings of the Audit Committee attended in person and $100 per
meeting for board meetings attended telephonically.

      For each director who becomes a director of our company on or after the
consummation of this initial public offering, (1) for the first year of service
as a director of our company, we will grant such director options to purchase
10,000 shares of our common stock, and (2) for each year of service as a
director of our company thereafter, we will grant such director options to
purchase 5,000 shares of our common stock at an exercise price per share equal
to the fair market value price per share of our common stock on the grant date.
We will also grant to W. Townsend Ziebold, Jr., a current director, (1) upon the
consummation of this offering, options to purchase 10,000 shares of our common
stock, and (2) for each of year of service as a director of our company
thereafter, options to purchase 5,000 shares of our common stock at an exercise
price per share equal to the fair market value price per share of our common
stock on the grant date.

Executive Compensation

      The following tables set forth in summary form information concerning the
compensation paid by us during the fiscal years ended December 31, 2002, 2001
and 2000, to our chief executive officer and our other executive officers whose
salary and bonus for the year exceeded $100,000 and who served as an executive
officer as of December 31, 2002.


                                       50


                           SUMMARY COMPENSATION TABLE



                                                                Annual Compensation                 Long Term Compensation
                                                                -------------------                 ----------------------
                                                                                                             Awards
                                                                                                             ------

                                                                        Salary            Bonus       Number of Securities
      Name and Principal Position                     Year            (dollars)         (dollars)     Underlying Options
      ---------------------------                     ----            ---------         ---------     ------------------
                                                                                            
      Eric A. Rose, M.D.                              2002                   0                 0                 0
          Chairman of the Board (1)                   2001                   0                 0                 0
                                                      2000              21,154                 0                 0

      Norman J. Barta
          President, Chief Executive Officer
          and Chief Financial Officer (2)             2002             139,331                 0                 0
                                                      2001             130,000               250                 0
                                                      2000             130,000            30,349        112,416(3)



- ----------

      (1)   Eric A. Rose, M.D. served as our president and our chief executive
            officer during the fiscal years ended December 31, 2001 and 2000. We
            paid Dr. Rose compensation for his services in such capacity.

      (2)   Mr. Barta served as our chief operating officer from October 1999
            until July 2002. We are currently conducting an executive search for
            a chief financial officer.

      (3)   Represents options to purchase shares of our common stock at an
            exercise price of $0.40 per share, a portion of which are
            exercisable and the remainder of which will vest upon the
            achievement of certain milestones.

          AGGREGATED OPTION EXERCISES AND FISCAL YEAR-END OPTION VALUES

      The following table sets forth information concerning the number of
unexercised options and the December 31, 2002 fiscal year-end value of
unexercised options on an aggregated basis held by Norman J. Barta. As we have
not granted any stock appreciation rights, there were no stock appreciation
rights outstanding at the end of fiscal year ended December 31, 2002.



                                                             Number of Securities             Value of Unexercised
                                                             Underlying Unexercised           In-the-Money Options at Fiscal
                                                             Options at Fiscal Year-End       Year-End (dollars) (1)
                               Shares                        ----------------------------     ------------------------------
                              Acquired          Value
    Name                     on Exercise      Realized       Exercisable    Unexercisable     Exercisable     Unexercisable
    ----                     -----------      --------       -----------    -------------     -----------     -------------
                                                                                               
    Norman J. Barta               0               0            67,450          44,966          $377,720          $251,810


      (1) Options are "in-the-money" if, on December 31, 2002, the fair market
      value of our common stock exceeded the exercise price of those options.
      The amount shown under the column "Value of Unexercised In-the-Money
      Options at Fiscal Year-End" is calculated by determining the difference
      between the aggregate fair market value of our common stock underlying the
      options on December 31, 2002 and the aggregate exercise price of the
      options. For purposes of this calculation, since there had been no public
      trading market for our common stock as of December 31, 2002, the assumed
      initial public offering price of $6.00 per share was used as the fair
      market per share value of our common stock on such date. Notwithstanding
      the foregoing, the assumed initial public offering price of $6.00 per
      share does not necessarily represent the actual per share value of our
      common stock on December 31, 2002.

Employment Agreements and Incentive Bonus Programs

Agreement with Mr. Norman J. Barta

      Norman J. Barta is serving as our president and chief executive officer
under a written employment agreement with us. This agreement has a term of three
years, ending on November 21, 2005. This agreement provides Mr. Barta with an
annual base salary upon the consummation of this offering of $225,000. On March
31, 2004, Mr. Barta's annual base salary will be increased by the dollar amount
paid to Mr. Barta in respect of six milestones discussed below. During each year
that Mr. Barta is employed with us, our compensation committee will review Mr.
Barta's performance and determine, in its sole discretion, whether to further
increase Mr. Barta's annual base salary.

      We have agreed to pay Mr. Barta a bonus equal to 10% of his salary at the
time each of the following six milestones is achieved: (1) the OLpur(TM) MD190
hemodiafiltration device or a related device is deemed ready to enter a clinical
trial by the FDA or an analogous body outside of the United States in a region
where there exists significant market opportunity for the sale of the device;
(2) the completion of a clinical trial of the device in such a region; (3) the
first regulatory approval of the device in such a region; (4) a second
hemodiafiltration device is deemed ready to enter a clinical trial by the FDA or
an analogous body outside of the United States in a region where there exists
significant market opportunity for the sale of such device; (5) the completion
of the clinical trial of the second device in such a region; and (6) the first
regulatory approval of the second device in such region. After March 2004, at
least two realistic milestones will be set for each year, with the total
potential payment for these additional milestones, if achieved, each year
equaling at least 20% of Mr. Barta's annual base salary as of the date the


                                       51


milestones are set. We have also agreed to pay to Mr. Barta a bonus of one
percent of the license fee or technology access fee not tied directly to sales
or expressed as a percentage of receipts or by reference to units produced which
is paid to us with respect to any consummated licensing agreement of the ESRD
therapy machines or dialyzer technology devices, subject to a maximum bonus of
$500,000 per license agreement (including renewals and amendments) and to an
aggregate maximum of $2,000,000.

      In February 2003, we will grant to Mr. Barta additional options, pursuant
to our equity incentive plan, to purchase 128,154 shares of our common stock at
an exercise price of $3.50 per share, a portion of which will be immediately
exercisable and the remainder of which will vest upon the achievement of certain
milestones. See "Equity Incentive Plan."

      Mr. Barta's employment agreement provides that upon termination by us for
cause, as defined in the agreement, death or disability, we will pay to him only
the base salary and any milestone bonuses due and payable under the terms of
this agreement through the date of termination and those that become due and
payable within 90 days of that date. If we terminate Mr. Barta for any other
reason, Mr. Barta will be entitled to (1) any accrued but unpaid base salary for
services rendered through the date of termination; (2) any unpaid milestone
bonuses due and payable on or prior to the date of termination or within 90 days
thereafter; (3) any unpaid licensing bonuses due and payable on or prior to the
date of termination or in respect of licenses consummated during the 90 days
following the date of termination; and (4) the continued payment of the base
salary (in the amount as of the date of termination) for the remainder of the
three-year term (to be paid at the times such base salary would have been paid
had his employment not been terminated).

Option/SAR Grants in Last Year

      We did not grant stock options to the executive officers or directors
named above or reprice any stock options during the year ended December 31,
2002.

Equity Incentive Plan

      In January 2000, we adopted the Nephros 2000 Equity Incentive Plan. In
January 2003, our board of directors approved and adopted the Amended and
Restated Nephros 2000 Equity Incentive Plan. Under both plans our compensation
committee, another designated committee of our board of directors or our board
of directors, may grant a variety of stock based incentive awards to our
employees, directors, officers and other individuals or entities whom the
compensation committee (or other committee or our board of directors) believes
are key to our success. The compensation committee may award shares of our
common stock, incentive stock options, nonqualified stock options or any
combination thereof.

      The compensation committee has broad latitude under both plans in
determining who shall receive awards, the amount of an award and the terms and
conditions of an award; however, under the Nephros 2000 Equity Incentive Plan,
no individual or entity may receive awards that together equal more than 20% of
the total shares of our common stock subject to option grants under the plan,
while under the Amended and Restated Nephros 2000 Equity Incentive Plan, no
individual or entity may receive awards that together equal more than 30% of the
total shares of our common stock subject to option grants under the plan during
any three-year period. Both plans provide that, under certain circumstances, our
compensation committee may adjust the numbers of shares available for award, as
well as outstanding awards, to reflect changes in our corporate structure or
other unusual events affecting us. We have designed these plans to allow awards
to be "performance based" compensation within the meaning of section 162(m) of
the U.S. Internal Revenue Code of 1986, as amended, and thus not to count
against the million dollar cap on deductible compensation paid annually to our
five top officers, if the compensation committee so chooses.

      The terms of the Amended and Restated Nephros 2000 Equity Incentive Plan
increase the aggregate number of shares of our common stock subject to options
covered by our 2000 Nephros Equity Incentive Plan from 1,011,743 shares to
1,124,159 shares. As of December 31, 2002, we had granted incentive stock
options and nonqualified stock options to purchase 461,467 shares of common
stock at a weighted average price of $0.40 per share under the provisions of the
Nephros 2000 Equity Incentive Plan, of which stock options to purchase 424,820
shares of common stock were then outstanding. As of December 31, 2002, options
for 256,831 shares were vested and eligible for exercise and none of the stock
options had been exercised. In January 2003, we granted nonqualified stock
options to purchase 359,056 shares of common stock at an exercise price of $3.50
per share, a portion of which were immediately exercisable and the remainder of
which will vest over time or upon the achievement of certain milestones. In
January 2003, our board of directors approved our grant to Mr. Barta, prior to
the consummation of this offering, of nonqualified stock options to purchase
128,154 shares of common stock at an exercise price of


                                       52


$3.50 per share, a portion of which will be immediately exercisable and the
remainder of which will vest upon the achievement of certain milestones.

                 Nephros 2000 Equity Incentive Plan Information
                             As of December 31, 2002



                                                                                                       Number of Shares of
                                               Number of Shares of Common                              Common Stock Remaining
                                               Stock to be Issued upon        Weighted-Average         Available for Future
                                               Exercise of Outstanding        Exercise Price of        Issuance under Equity
                                               Options                        Outstanding Options      Incentive Plan (1)
                                                                                                      
Nephros 2000 Equity Incentive Plan
Information                                            424,820                       $0.40                     586,923


- ----------
(1) Excludes shares of our common stock to be issued upon exercise of
outstanding options.

Limitations on liability and indemnification

      We are a Delaware corporation. The Delaware General Corporation Law
provides that Delaware corporations may indemnify any of their directors or
officers who are or are threatened to be a party to any legal action resulting
from fulfilling their duties to the corporation against reasonable expenses,
judgments and fees (including attorneys' fees) incurred in connection with such
action if the director or officer acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. The termination of any
action, suit or proceeding by judgment, order, settlement, conviction, or upon a
plea of no contest, or its equivalent, will not create a presumption that the
person did not act in good faith and in a manner which he reasonably believed to
be in or not opposed to the best interests of the corporation, and, with respect
to any criminal action or proceeding, had reasonable cause to believe his
conduct was unlawful. However, no indemnification will be permitted in cases
where it is determined that the director or officer was liable for negligence or
misconduct in the performance of his duty to the corporation, unless the court
in which such action was brought determines that the person is fairly and
reasonably entitled to indemnity, and then only for the expenses that the court
deems proper. A corporation is permitted to advance payment for expenses
occurred in defense of an action if its board of directors decides to do so.

      In addition, Delaware corporations may purchase and maintain insurance on
behalf of any person who is or was a director or officer of the corporation
against any liability asserted against him and incurred by him in such capacity
whether or not the corporation would have the power to indemnify him against
such liability under the provisions of the Delaware General Corporation Law. We
currently have directors' and officers' liability insurance to provide our
directors and officers with insurance coverage for losses arising from claims
based on breaches of duty, negligence, errors and other wrongful acts.


                                       53


                              CERTAIN TRANSACTIONS

      Prior to our fiscal year ended December 31, 2000, we completed three
private placements of our equity securities, in which some of our current and
former directors and holders of more than 5% of our common stock purchased
equity securities. In 1997, we consummated our private placement of an aggregate
of 4,000,000 shares of our series A convertible preferred stock. In February
2000, we consummated our private placement of an aggregate of 2,333,333 shares
of our series B convertible preferred stock. In May 2000 we consummated our
private placement of an aggregate of 2,197,550 shares of our series C
convertible preferred stock. The current and former directors and holders of
more than 5% of our common stock who purchased equity securities in these
private placements purchased equity securities on substantially the same terms
and conditions as the other purchasers of equity securities in these private
placements.

      As of October 2001, we had issued eleven convertible notes in the
aggregate principal amount of $940,000, pursuant to which we agreed to pay, in
June 2001, to the holders the principal amount due under each holder's
convertible note, together with interest on the unpaid principal amount at the
rate of 9% per annum, compounded semi-annually, from the date of the convertible
note. As of November 30, 2001, all of these notes were converted into an
aggregate of 940,000 shares of our series C convertible preferred stock. Eric A.
Rose, M.D. and Donald G. Drapkin, two of our directors and holders of more than
5% of our common stock, Ronald O. Perelman, a holder of more than 5% of our
common stock, and WP Nephros Partners, LLC, which subsequently transferred its
notes to Cypress Capital Assets, L.P., a beneficial holder of more than 5% of
our common stock, purchased such notes, as set forth below.



                                                                            Number of Shares of Series C
                                                                             Convertible Preferred Stock
                                                 Principal Amount          Issued/Issuable Upon Conversion
                 Name                            of Convertible Note             of Convertible Note
                 ----                            -------------------                ----------------
                                                                                  
                 Eric A. Rose, M.D.                    $240,000                         240,000
                 Donald G. Drapkin                      $50,000                          50,000
                 Ronald O. Perelman                    $100,000                         100,000
                 WP Nephros Partners, LLC              $150,000                         150,000


      In April 2002, we issued eight convertible notes in the aggregate
principal amount of $250,000, pursuant to which we agreed to pay, in August
2002, to the holders the principal amount due under each holder's convertible
note, together with interest on the unpaid principal amount at the rate of 6%
per annum, compounded semi-annually, from the date of the convertible note. The
holders of these notes have since agreed to irrevocably convert them into an
aggregate of 250,000 shares of our series A convertible preferred stock
immediately prior to our receipt of the remaining $1,500,000 due under the
Lancer Subscription Agreement (see "Business -- Settlement Agreements"), or at
such earlier time as the holders may elect, provided that such shares of series
A convertible preferred stock need not be issued by the Company until the
Company has increased the number of authorized shares of series A convertible
preferred stock by amending its certificate of incorporation. At any time prior
to the date of delivery to the holders of such shares, the holders may require
us to issue to them, in lieu of such shares, the number of shares of our common
stock into which such number of shares of series A convertible preferred stock
is convertible. The holders have accepted the right to receive the foregoing
shares in full satisfaction of our obligation to repay the notes. We have also
agreed to issue to the holders of these notes, prior to the effectiveness of
this prospectus, warrants to purchase an aggregate of 125,000 shares of our
series A convertible preferred stock, or such shares of our common stock as may
be issuable upon mandatory conversion of our series A convertible preferred
stock, at a price of $1.00 per share, to be exercisable through April 2004. Each
of Eric A. Rose, M.D., Donald G. Drapkin and Ronald O. Perelman purchased
securities in this transaction. Each of them acquired (1) convertible notes in
the principal amount set forth in the table below, (2) the number of shares of
our series A convertible preferred stock set forth in the table below and (3)
warrants to purchase the number of shares of our series A convertible preferred
stock set forth in the table below.



                                                              Number of Shares of
                                                              Series A Convertible      Number of Shares of
                                                                Preferred Stock        Series A Convertible
                                                                 Issuable Upon            Preferred Stock
                                     Principal Amount            Conversion of             Issuable Upon
         Name                        of Convertible Note        Convertible Note       Exercise of Warrants
         ----                        -------------------        ----------------       --------------------
                                                                                     
         Eric A. Rose, M.D.                 $75,000                  75,000                   37,500
         Donald G. Drapkin                  $25,000                  25,000                   12,500
         Ronald O. Perelman                 $25,000                  25,000                   12,500



                                       54


      During 2001 and 2002, Eric A. Rose, M.D. made loans to us, which loans are
payable when we have sufficient funds available to repay them and do not bear
any interest. As of the date of this prospectus, the outstanding balance due
under these loans is $110,000. We intend to use a portion of the net proceeds of
this offering to repay the outstanding balance. See "Use of Proceeds."

      We believe that all of the transactions described above were made and are
on terms no less favorable to us than those that could have been obtained from
independent third parties in arms-length negotiations.


                                       55


                             PRINCIPAL STOCKHOLDERS

      The following table sets forth information regarding beneficial ownership
of our common stock before this offering and as adjusted to reflect the sale of
shares of our common stock in this offering, by:

      o     each person, group or entity who beneficially owns more than 5% of
            our common stock;

      o     each of our directors;

      o     each of our named executive officers; and

      o     all of our directors and executive officers as a group.

      The following table reflects the number of shares of our common stock
outstanding as of the date of this prospectus and assumes (i) the completion of
the reverse stock split pursuant to which each share of our common stock then
outstanding will be converted into 0.2248318 of one share of our common stock
prior to the effectiveness of the registration statement to which this
prospectus relates; and (ii) the automatic conversion of all shares of series A
convertible preferred stock, series B convertible preferred stock and series C
convertible preferred stock outstanding upon the consummation of this offering,
which includes certain shares of our series A convertible preferred stock
issuable upon conversion of outstanding convertible notes in the aggregate
principal amount of $250,000 (see "Certain Transactions"), into 2,361,963 shares
of our common stock, immediately prior to the consummation of this offering. The
table reflects percentages of beneficial ownership (i) if the underwriters'
over-allotment option is not exercised and (ii) if the underwriters'
over-allotment option is exercised in full.

      The amounts and percentages of common stock beneficially owned are
reported on the basis of regulations of the Securities and Exchange Commission
governing the determination of beneficial ownership of securities. Under the
rules of the Securities and Exchange Commission, a person is deemed to be a
"beneficial owner" of a security if that person has or shares "voting power,"
which includes the power to vote or to direct the voting of that security, or
"investment power," which includes the power to dispose of or to direct the
disposition of that security. A person is also deemed to be a beneficial owner
of any security as to which that person has a right to acquire beneficial
ownership presently or within 60 days. Under these rules, more than one person
may be deemed to be a beneficial owner to the same securities, and a person may
be deemed to be the beneficial owner of the same securities as to which that
person has no economic interest. Including those shares in the tables does not,
however, constitute an admission that the named stockholder is a direct or
indirect beneficial owner of those shares.

      Unless otherwise indicated, each person or entity named in the table has
sole voting power and investment power (or shares that power with that person's
spouse) with respect to all shares of capital stock listed as owned by that
person or entity.



                                                                                  Percentage of Beneficial Ownership
                                                                                  ----------------------------------
                                                    Number of Shares               After Offering    After Offering
                                                    of Common Stock                 (Assuming No        (Assuming
                                                      Beneficially                  Exercise of        Exercise of
                                                      Owned Before     Before      Over-Allotment    Over-Allotment
Name and Address                                        Offering       Offering       Option)        Option in Full)
- ----------------                                        --------       --------       -------        ---------------
                                                                                               
Norman J. Barta (1) ...........................        118,036            3.2            1.9                1.8
Eric A. Rose, M.D.(2) .........................        479,130           13.2            7.8                7.4
Lawrence J. Centella (3) ......................         22,483              *              *                  *
Howard Davis(4) ...............................         10,000              *              *                  *
Donald G. Drapkin(5) ..........................        267,185            7.4            4.4                4.1
William J. Fox(6) .............................         37,319            1.0              *                  *
W. Townsend Ziebold, Jr.(7) ...................         10,000              *              *                  *
Cypress Capital Assets, L.P.(8) ...............        608,346           16.8            9.9                9.4
Ronald O. Perelman (9) ........................        305,537            8.4            5.0                4.7
Lindsay A. Rosenwald(10) ......................        323,956            8.9            5.3                5.0

All executive officers and directors as a group        944,155           25.0           15.0               14.2


- ----------
*     Represents less than 1% of the outstanding shares of our common stock.

(1)   Mr. Barta's address is c/o Nephros, Inc., 3960 Broadway New York, New York
      10032. The shares identified as being beneficially owned by Mr. Barta
      include (i) 67,450 shares of our common stock issuable upon exercise of
      options to purchase shares of our common stock at an exercise price of
      $.40 per share and (ii) 50,587 shares of our common stock issuable upon
      exercise of options to purchase shares of our common stock at an exercise
      price of $3.50 per share, which will be granted to Mr. Barta and will be


                                       56


      immediately exercisable prior to the consummation of this offering. Such
      shares do not include (i) 44,966 shares of our common stock issuable upon
      exercise of options to purchase shares of our common stock at an exercise
      price of $.40 per share which will vest upon the achievement of certain
      milestones or (ii) 77,567 shares of our common stock issuable upon
      exercise of options to purchase shares of our common stock at an exercise
      price of $3.50 per share which will be granted to Mr. Barta prior to the
      consummation of this offering and will vest upon the achievement of
      certain milestones.

(2)   Dr. Rose's address is c/o Nephros, Inc., 3960 Broadway New York, New York
      10032. The shares identified as being beneficially owned by Dr. Rose
      include (i) 109,094 shares of our common stock issuable upon the automatic
      conversion of shares of our series C convertible preferred stock upon the
      consummation of this offering, and (ii) 25,293 shares of our common stock
      issuable upon conversion of our series A convertible preferred stock and
      shares of our series A convertible preferred stock which are themselves
      issuable upon exercise of warrants at an exercise price of $1.00 per
      share.

(3)   Mr. Centella's address is c/o Nephros, Inc., 3960 Broadway New York, New
      York 10032.

(4)   Mr. Davis' address is c/o GunnAllen Financial, Inc., 1715 North Westshore
      Blvd., Suite 700, Tampa, Florida 33607. The shares identified as being
      beneficially owned by Mr. Davis include 10,000 shares of our common stock
      issuable upon exercise of options to purchase shares of our common stock
      at an exercise price of $3.50 per share, which will be granted to Mr.
      Davis upon the consummation of this offering and which will be immediately
      exercisable.

(5)   Mr. Drapkin's address is 35 East 62nd Street, New York, New York 10021.
      The shares identified as being beneficially owned by Mr. Drapkin include
      (i) 26,417 shares of our common stock issuable upon automatic conversion
      of shares of our series A convertible preferred stock and shares of our
      series A convertible preferred stock which are themselves issuable upon
      exercise of warrants at an exercise price of $1.00 per share upon the
      consummation of this offering, and (ii) 21,288 shares of our common stock
      issuable upon automatic conversion of shares of our series C convertible
      upon the consummation of this offering.

(6)   Mr. Fox's address is c/o Arcade Marketing, Inc., 1700 Broadway, Suite
      2200, New York, New York 10019. The shares identified as being
      beneficially owned by Mr. Fox include (i) 17,987 shares of our common
      stock issuable upon automatic conversion of our series A convertible
      preferred stock upon the consummation of this offering, (ii) 9,332 shares
      of our common stock issuable upon automatic conversion of our series C
      convertible preferred stock upon the consummation of this offering, and
      (iii) 10,000 shares of our common stock issuable upon exercise of options
      to purchase shares of our common stock at an exercise price of $3.50 per
      share, which will be granted to Mr. Fox upon the consummation of this
      offering and which will be immediately exercisable.

(7)   Mr. Ziebold's address is 1301 Avenue of the Americas, 44th Floor, New
      York, New York 10019. The shares identified as being beneficially owned by
      Mr. Ziebold include 10,000 shares of our common stock issuable upon
      exercise of options to purchase shares of our common stock at an exercise
      price of $3.50 per share, which will be granted to Mr. Ziebold upon the
      consummation of this offering and which will be immediately exercisable.

(8)   Cypress Capital Assets, LP's address is c/o Wasserstein & Co., L.P., 1301
      Avenue of the Americas, 44th Floor, New York NY 10019. The general partner
      of Cypress Capital Assets, LP ("CCA") is Cypress Capital Advisors, LLC.
      The board of Cypress Capital Advisors, LLC is comprised of Bruce
      Wasserstein, Pamela Wasserstein and Ellis Jones. The shares identified as
      being beneficially owned by CCA include (i) 489,860 shares of our common
      stock issuable upon automatic conversion of shares of our series B
      convertible preferred stock upon the consummation of this offering, which
      are owned by WPPN, LP, the general partner of which is Cypress Management
      Partners, LLC, of which CCA is the sole member and (ii) 118,596 shares of
      our common stock issuable upon automatic conversion of shares of our
      series C convertible preferred stock upon the consummation of this
      offering, all of which shares of series C convertible preferred stock are
      owned by CCA (which shares CCA acquired from WP Nephros Partners, LLC).

(9)   Mr. Perelman's address is 35 East 62nd Street, New York, New York 10021.
      The shares identified as being beneficially owned by Mr. Perelman include
      (i) 188,296 shares of our common stock issuable upon automatic conversion
      of shares of our series A convertible preferred stock upon the
      consummation of this offering, and (ii) 117,240 shares of our common stock
      issuable upon automatic conversion of shares of our series C convertible
      preferred stock upon the consummation of this offering.

(10)  Mr. Rosenwald's address is c/o Paramount Capital Asset Management, Inc.,
      787 Seventh Avenue, New York, NY 10019. Mr. Rosenwald is a former director
      of our company. The shares identified as being beneficially owned by Mr.
      Rosenwald include (i) 89,932 shares of our common stock issuable upon
      automatic conversion of shares of our series A convertible preferred stock
      upon the consummation of this offering, and (ii) 46,664 shares of our
      common stock issuable upon automatic conversion of shares of our series C
      convertible preferred stock upon the consummation of this offering.


                                       57


                            DESCRIPTION OF SECURITIES

Authorized and Outstanding Capital Stock

      Our authorized capital stock consists of 30,000,000 shares of common stock
and 10,000,000 shares of preferred stock. As of the date of this prospectus and
giving effect to a reverse stock split, discussed in detail below, there were
1,261,194 shares of common stock outstanding and 9,470,883 shares of preferred
stock outstanding, held by 40 stockholders of record. Of our preferred stock,
there were 4,000,000 shares of our series A convertible preferred stock
outstanding, 2,333,333 shares of our series B convertible preferred stock
outstanding, and 3,137,550 shares of our series C convertible preferred stock
outstanding.

      Immediately prior to the effectiveness of the registration statement to
which this prospectus relates, each share of our common stock then outstanding
will be converted into 0.2248318 of one share of our common stock, as described
below under the heading "-- Reverse Stock Split." Simultaneously with the
consummation of this offering, all outstanding series A convertible preferred
stock, series B convertible preferred stock and series C convertible preferred
stock will automatically be converted into 2,305,755 shares of our common stock.

      After giving effect to the reverse stock split and the conversions
discussed in the preceding paragraph, but without giving effect to the sale of
shares of our common stock pursuant to this offering, there will be 3,566,950
shares of common stock outstanding and no shares of preferred stock outstanding.
After giving effect to the reverse stock split and the conversions of our
convertible preferred stock as well as our convertible notes in the aggregate
principal amount of $250,000 and the sale of shares of our common stock pursuant
to this offering, there will be a total of 6,123,158 shares of common stock
outstanding and no shares of preferred stock outstanding, assuming that the
underwriters do not exercise their over-allotment option.

Common Stock

      Holders of our common stock are entitled to one vote for each share held
of record on all matters submitted to a vote of our stockholders and do not have
cumulative voting rights. Accordingly, holders of a majority of the shares of
our common stock entitled to vote in any election of directors may elect all of
the directors standing for election. Apart from preferences that may be
applicable to any holders of preferred stock outstanding at the time, holders of
our common stock are entitled to receive dividends, if any, ratably as may be
declared from time to time by our board of directors out of funds legally
available therefor. Upon our liquidation, dissolution or winding up, the holders
of our common stock are entitled to receive ratably our net assets available
after the payment of all liabilities and liquidation preferences on any
outstanding preferred stock. Holders of our common stock have no preemptive,
subscription, redemption or conversion rights, and there are no redemption or
sinking fund provisions applicable to our common stock. The rights, preferences
and privileges of holders of our common stock are subject to, and may be
adversely affected by, the rights of the holders of shares of any series of
preferred stock which we may designate and issue in the future.

Preferred Stock

      Under the terms of our amended and restated certificate of incorporation,
our board of directors has authority, without any vote or action of our
stockholders, to issue up to 10,000,000 shares of "blank check" preferred stock
in one or more series and to fix the related rights, preferences, privileges and
restrictions, including voting rights, dividend rights, conversion rights,
redemption terms (including sinking fund provisions) and liquidation preferences
and the number of shares constituting a series or the designation of such
series.

      The rights of the holders of our common stock will be subject to, and
could be adversely affected by, the rights of the holders of any preferred stock
that we may issue in the future. Our board of directors may designate and fix
rights, preferences, privileges and restrictions of each series of preferred
stock which are greater than those of our common stock. Our issuance of
preferred stock could, among other things:

      o     restrict dividends on our common stock;

      o     dilute the voting power of our common stock;

      o     impair the liquidation rights of our common stock; or

      o     discourage, delay or prevent a change of control of our company.

Although we currently have no plans to issue shares of blank check preferred
stock, we may issue them in the future.


                                       58


Underwriter's Warrants

      Subject to the approval of the National Association of Securities Dealers,
Inc., upon the consummation of this offering, we will issue to the underwriters
or their respective designees, in exchange for $100, warrants to purchase up to
an aggregate of 250,000 shares of our common stock. We have reserved an
equivalent number of shares of common stock for issuance upon exercise of these
warrants. Each warrant represents the right to purchase one share of common
stock for a period of four years commencing one year from the effective date of
this offering. The exercise price of the warrants is 165% of the price at which
our shares of common stock are sold pursuant to this offering. The warrants
contain provisions that protect their holders against dilution by adjustment of
the exercise price and number of shares issuable upon exercise on the occurrence
of specific events, such as stock dividends or other changes in the number of
our outstanding shares except for shares issued under certain circumstances,
including shares issued under our equity incentive plan and any equity
securities for which adequate consideration is received. No holder of these
warrants will possess any rights as a stockholder unless the warrant is
exercised. The holders of the warrants will be entitled to customary
"piggy-back" registration rights to register the shares underlying the warrants.
Such registration rights shall continue for a period of five years from the
effective date of this offering.

Other Warrants

      In June 2002, in settlement of certain amounts owed by us to Plexus
Services Corp., a former supplier of engineering consulting services, we issued
warrants to purchase 134,899 shares of our common stock at an exercise price of
$13.34 per share, which are exercisable through June 2007. See "Description of
Securities -- Other Warrants" and "Business -- Settlement Agreements."

      In connection with our issuance in April 2002 of eight convertible notes
in the aggregate principal amount of $250,000, we issued warrants to the holders
of these notes to purchase an aggregate of 125,000 shares of our series A
convertible preferred stock, or such shares of our common stock as may be
issuable upon mandatory conversion of our series A convertible preferred stock,
at an exercise price of $1.00 per share, which are exercisable through April
2004.

      Pursuant to our settlement agreement, dated as of January 31, 2003, with
Lancer Offshore, Inc., Lancer Offshore, Inc. has retained warrants to purchase
75,000 shares of our common stock at an exercise price of $2.50 per share,
exercisable through December 2007. See "Business -- Settlement Agreements."

      Pursuant to our settlement agreement, dated as of February 13, 2003, with
Hermitage Capital Corporation described in "Business -- Settlement Agreements,"
we expect to issue to Hermitage Capital Corporation warrants to purchase 60,000
shares of our common stock at an exercise price of $2.50 per share, exercisable
through December 2007. See "Business -- Settlement Agreements."

Reverse Stock Split

      Prior to the effectiveness of the registration statement of which this
prospectus is a part, the Company effected a reverse stock split pursuant to
which each share of our common stock then outstanding was converted into
0.2248318 of one share of our common stock.

Registration Rights

      We granted registration rights to holders of shares of our series A
convertible preferred stock pursuant to a stock purchase agreement. Pursuant to
the stock purchase agreement, we granted each of these holders piggy-back
registration rights to, on up to two occasions, include the shares of common
stock underlying their respective shares of our series A convertible preferred
stock in any registration statement we file on our own behalf or on behalf of
our other stockholders, at any time after this offering. The piggy-back
registration rights will expire once the stockholders' shares of common stock
become freely saleable under Rule 144 or Rule 701 during any 90-day period,
provided, that these provisions do not apply to any stockholder who owns more
than 2% of our outstanding common stock. Subject to lock-up agreements, we could
be required to file additional registration statements, covering up to 899,327
shares in the aggregate, for the stockholders who hold these shares.

      We have also entered into registration rights agreements with holders of
shares of our series B convertible preferred stock and our series C convertible
preferred stock. Pursuant to these registration rights agreements, we granted
each of these


                                       59


holders (1) demand registration rights to, on no more than two occasions at any
time six months after the effective date of this prospectus, request that we
file a registration statement on Form S-1 under the Securities Act on their
behalf to register the shares of common stock underlying their respective shares
of preferred stock; (2) piggy-back registration rights to include the shares of
common stock underlying their respective shares of preferred stock in any
registration statement we file on our own behalf or on behalf of our other
stockholders, and (3) unlimited rights to request that we file a registration
statement on Form S-3 on their behalf to register the shares of common stock
underlying their respective shares of preferred stock. The registration rights
will expire once the existing stockholders' shares of common stock become freely
saleable under Rule 144. Subject to lock-up agreements, we could be required to
file additional registration statements, covering up to 1,401,517 shares in the
aggregate, for the stockholders who hold these shares.

      We have also entered into a registration rights agreement with our
underwriters. Pursuant to this agreement, the holders of the underwriters'
warrants will be entitled to customary "piggy-back" registration rights to
register the shares of common stock underlying the warrants. Such registration
rights shall continue for a period of five years from the effective date of this
offering.

Anti-Takeover Effects of Provisions of the Delaware General Corporation Law and
Our Charter Documents.

      Several provisions of the Delaware General Corporation Law and our amended
and restated certificate of incorporation and bylaws may have anti-takeover
effects. These provisions are intended to avoid costly takeover battles, lessen
our vulnerability to a hostile change of control and enhance the ability of our
board of directors to maximize stockholder value in connection with any
unsolicited offer to acquire us. However, these anti-takeover provisions, which
are summarized below, could also discourage, delay or prevent (1) the merger or
acquisition of our company by means of a tender offer, a proxy contest or
otherwise, that a stockholder may consider in its best interest and (2) the
removal of incumbent officers and directors.

Blank Check Preferred Stock

      Under the terms of our amended and restated certificate or incorporation,
our board of directors has authority, without any further vote or action by our
stockholders, to issue up to 10,000,000 shares of blank check preferred stock.
Our board of directors may issue shares of preferred stock on terms calculated
to discourage, delay or prevent a change of control of our company or the
removal of our management.

Classified Board of Directors

      Our amended and restated certificate of incorporation provides for the
division of our board of directors into three classes of directors, with each
class as nearly equal in number as possible, serving staggered, three-year
terms. Approximately one-third of our board of directors will be elected each
year. This classified board provision could discourage a third party from making
a tender offer for our shares or attempting to obtain control of our company. It
could also delay stockholders who do not agree with the policies of the board of
directors from removing a majority of the board of directors for two years.

Business Combinations

      As a Delaware corporation, we are subject to Section 203 of the Delaware
General Corporation Law which contains specific provisions regarding "business
combinations" between corporations organized under the laws of the State of
Delaware and "interested stockholders." These provisions prohibit us from
engaging in a business combination with an interested stockholder for a period
of three years after the date of the transaction in which the person became an
interested stockholder, unless:

      o     prior to such date, our board of directors approved either the
            business combination or the transaction that resulted in the
            stockholder becoming an interested stockholder;

      o     upon consummation of the transaction that resulted in the
            stockholder becoming an interested stockholder, the interested
            stockholder owned at least 85% of the voting stock of the
            corporation outstanding at the time the transaction commenced; or


                                       60


      o     on or subsequent to such date, the business combination is approved
            by the board of directors and authorized at an annual or special
            meeting of stockholders by the affirmative vote of at least 66 2/3%
            of the outstanding voting stock that is not owned by the interested
            stockholder.

For purposes of these provisions, a "business combination" includes mergers,
consolidations, exchanges, asset sales, leases and other transactions resulting
in a financial benefit to the interested stockholder and an "interested
stockholder" is any person or entity that beneficially owns 15% or more of our
outstanding voting stock and any person or entity affiliated with or controlling
or controlled by that person or entity.

Election and Removal of Directors

      Our amended and restated certificate of incorporation does not provide for
cumulative voting in the election of directors. Our by-laws require parties
other than the board of directors to give advance written notice of nominations
for the election of directors. Our amended and restated certificate of
incorporation also provide that our directors may be removed only for cause and
only upon the affirmative vote of the holders of at least a majority of the
outstanding shares of our common stock entitled to vote for such directors.
These provisions may discourage, delay or prevent the removal of incumbent
officers and directors.

Limited Actions by Stockholders

      Our amended and restated certificate of incorporation and our by-laws
provide that any action required or permitted to be taken by our stockholders
must be effected at an annual or special meeting of stockholders or by the
unanimous written consent of our stockholders. Our amended and restated
certificate of incorporation provide that, subject to certain exceptions, only
our board of directors, the chairman of our board of directors, our president,
vice president or secretary may call special meetings of our stockholders. Our
bylaws also contain advance notice requirements for proposing matters that can
be acted on by the stockholders at a stockholder meeting. Accordingly, a
stockholder may be prevented from calling a special meeting for stockholder
consideration of a proposal over the opposition of our board of directors and
stockholder consideration of a proposal may be delayed until the next annual
meeting.

American Stock Exchange Listing

      We have applied for approval of our common stock for quotation on the
American Stock Exchange under the symbol "NEP." Even if we are approved for
listing on the AMEX, we cannot assure you that a trading market for our
securities will develop or be sustained, or at what price the securities will
trade. In addition, we may fail to meet certain minimum standards for continued
listing. In such event, our common stock will be delisted, and its price will no
longer be quoted. This may make it extremely difficult to sell or trade our
common stock.


                                       61


                         SHARES ELIGIBLE FOR FUTURE SALE

      Upon completion of this offering, we will have 6,123,158 shares of common
stock outstanding, assuming the underwriters' over-allotment option is not
exercised. Of these shares, the shares of common stock offered hereby will be
freely tradable without restriction unless these shares are held by affiliates
as defined in Rule 144(a) under the Securities Act. The remaining 3,623,158
shares of common stock to be outstanding after this offering will be restricted
shares under the Securities Act. Restricted securities may be sold in the public
market only if registered or if they qualify for an exemption from registration
under Rule 144. Subject to the lock-up agreements described below and the
provisions of Rule 144, additional shares will become available for sale in the
public market.

      In general, under Rule 144, an affiliate of ours, or a person, or persons
whose shares are aggregated, who has beneficially owned restricted shares for at
least one year, will be entitled to sell that number of shares in any
three-month period that does not exceed the greater of:

      o     one percent of the then outstanding shares of our common stock,
            which will be approximately 65,539 shares immediately after this
            offering, assuming no exercise of the underwriters' over-allotment
            option, or

      o     the average weekly trading volume during the four calendar weeks
            preceding the date on which notice of the sale is filed with the
            Securities and Exchange Commission.

      Sales pursuant to Rule 144 are subject to certain requirements relating to
manner of sale, notice and availability of current public information about us.
A person or persons whose restricted shares are aggregated who is not deemed to
have been our affiliate at any time during the 90 days immediately preceding the
sale and who has beneficially owned his or her shares for at least two years is
entitled to sell his or her restricted shares pursuant to Rule 144(k) without
regard to the limitations described above.

      All of our existing security holders (other than Lancer Offshore, Inc.)
will be subject to lock-up agreements which prohibit the sale of all of their
shares of our common stock in the public market until one year from the
effective date of this prospectus, and thereafter to the extent such sales, on a
cumulative basis for each holder, exceed 1/3 of our common stock held by such
holder prior to 15 months from the effective date or 2/3 of our common stock
held by such holder prior to 18 months from the effective date. Lancer Offshore
Inc. will be subject to a lock-up agreement which prohibits the sale of all of
its shares in the public market until 180 days after the effective date. There
are presently no agreements between the underwriters and any of our stockholders
or affiliates releasing them from these lock-up agreements prior to the
expiration of the applicable period.

      We granted registration rights to holders of shares of our series A
convertible preferred stock pursuant to a stock purchase agreement. Pursuant to
the stock purchase agreement, we granted each of these holders piggy-back
registration rights to, on up to two occasions, include the shares of common
stock underlying their respective shares of our series A convertible preferred
stock in any registration statement we file on our own behalf or on behalf of
our other stockholders, at any time after this offering. The piggy-back
registration rights will expire once the stockholders' shares of common stock
become freely saleable under Rule 144 or Rule 701 during any 90-day period,
provided, that these provisions do not apply to any stockholder who owns more
than 2% of our outstanding common stock. Subject to lock-up agreements, we could
be required to file additional registration statements, covering up to 899,327
shares in the aggregate, for the stockholders who hold these shares.

      We have also entered into registration rights agreements with holders of
shares of our series B convertible preferred stock and our series C convertible
preferred stock and certain of our convertible notes and warrants. Pursuant to
these registration rights agreements, we granted each of these holders (1)
demand registration rights to, on no more than two occasions at any time six
months after the effective date of this prospectus, request that we file a
registration statement on Form S-1 under the Securities Act on their behalf to
register the shares of common stock underlying their respective shares of
preferred stock; (2) piggy-back registration rights to include the shares of
common stock underlying their respective shares of preferred stock in any
registration statement we file on our own behalf or on behalf of our other
stockholders, and (3) unlimited rights to request that we file a registration
statement on Form S-3 on their behalf to register the shares of common stock
underlying their respective shares of preferred stock, notes and warrants. The
registration rights will expire once the existing stockholders' shares of common
stock become freely saleable under Rule 144. Subject to lock-up agreements, we
could be required to file additional registration statements, covering up to
1,401,517 shares in the aggregate, for the stockholders who hold these shares.


                                       62


      We have also entered into a registration rights agreement with our
underwriters. Pursuant to this agreement, the holders of the underwriters'
warrants will be entitled to customary "piggy-back" registration rights to
register the shares of common stock underlying the warrants. Such registration
rights shall continue for a period of five years from the effective date of this
offering.

      Prior to this offering, there has been no public market for our common
stock. Sales of substantial amounts of common stock or the availability of such
shares for sale could adversely affect prevailing market prices of our common
stock and our ability to raise additional capital. You should read the
discussion under the heading entitled "Risk Factors -- Future sales of our
common stock could cause the market price of our common stock to decline" for
further information about the effect future sales could have on the market price
of our common stock.


                                       63


                                  UNDERWRITING

      Subject to the terms and conditions of the underwriting agreement between
us and GunnAllen Financial, Inc. and The Shemano Group, Inc., the underwriters
of this offering, a copy of which agreement is filed as an exhibit to the
registration statement of which this prospectus forms a part, we have agreed to
sell to the underwriters, and the underwriters have agreed to purchase all
2,500,000 shares of our common stock offered. The underwriters have severally
agreed to purchase the respective number of shares of our common stock set forth
in the table below. Howard Davis, executive vice president of GunnAllen
Financial, Inc., will serve as a director of our company upon consummation of
this offering.



         Underwriter                      Address                                Number of Shares
         -----------                      -------                                ----------------
                                                                               
         GunnAllen Financial, Inc.        1715 North Westshore Blvd.                 1,250,000
                                          Suite 700
                                          Tampa, Florida  33607

         The Shemano Group, Inc.          601 California Street                      1,250,000
                                          Suite 1150
                                          San Francisco, California  94108


      The underwriters have advised us that they will offer the shares as set
forth on the cover page of this prospectus, which includes the underwriting
discount indicated there, and that they will initially allow concessions not in
excess of $0.30 per share on sales to certain dealers. After the initial public
offering, concessions to dealer terms may be changed by the underwriters.

      The underwriters have advised us that they do not intend to confirm sales
of the shares to any account over which they exercise discretionary authority in
an aggregate amount in excess of five (5%) percent of the total securities
offered hereby.

      We have granted to the underwriters an option which expires 45 days after
the date of this prospectus, exercisable as provided in the underwriting
agreement, to purchase up to an additional 375,000 shares of our common stock at
a net price of $5.47 per share which option may be exercised only for the
purpose of covering over-allotments, if any. To the extent that the underwriters
exercise this option, each of the underwriters will become obligated, subject to
certain conditions, to purchase approximately the same percentage of additional
shares of common stock as the number of shares of common stock to be purchased
by it in the above table bears to 2,500,000, and we will be obligated, pursuant
to this option, to sell these shares to the underwriters to the extent this
option is exercised.

      The underwriting agreement provides that we will reimburse the
underwriters for their expenses on a non-accountable basis in the aggregate
amount equal to 3% of the gross proceeds of this offering, $30,000 of which has
been paid to date and the balance of which shall be paid upon the consummation
of this offering. The underwriting agreement provides for reciprocal
indemnification between us and the underwriters against certain liabilities in
connection with the registration statement, including liabilities under the
Securities Act of 1933, as amended. For a period of three years following the
effective date of this offering, GunnAllen Financial Inc., one of our
underwriters, will have the right to have one representative attend each meeting
of our board of directors and each meeting of any committee thereof and to
participate in all discussions of each such meeting.

      Subject to the approval of the National Association of Securities Dealers,
Inc., upon the consummation of this offering, we will sell to the underwriters
or their respective designees at an aggregate purchase price of $100, warrants
to purchase up to an aggregate of 250,000 shares of our common stock. Each
warrant represents the right to purchase one share of common stock for a period
of four years commencing one year from the effective date of this offering. The
exercise price of the warrants is 165% of the price at which our shares of
common stock are sold pursuant to this offering. The warrants contain provisions
that protect their holders against dilution by adjustment of the exercise price
and number of shares issuable upon exercise on the occurrence of specific
events, such as stock dividends or other changes in the number of our
outstanding shares except for shares issued under certain circumstances,
including shares issued under our equity incentive plan and any equity
securities for which adequate consideration is received. No holder of these
warrants will possess any rights as a stockholder unless the warrant is
exercised. The warrants may not be sold, transferred, assigned or hypothecated
for a period of one year from the effective date of this offering, except to
officers or partners (but not directors) of the underwriters and members of the
selling group and/or their officers or partners.


                                       64


      The holders of the warrants will be entitled to customary "piggy-back"
registration rights to register the shares underlying the warrants. Such
registration rights shall continue for a period of five years from the effective
date of this offering. Any profit realized from the sale of shares of common
stock underlying the underwriters' warrants may be deemed additional
underwriting compensation. The exercise of the underwriters' over-allotment
option will not result in an increase in the number of shares of common stock
underlying the underwriters' warrants or in the granting of any additional
warrants to the underwriters.

      All of our existing security holders (other than Lancer Offshore, Inc.)
will be subject to lock-up agreements which prohibit the sale of all of their
shares of our common stock in the public market until one year from the
effective date of this prospectus, and thereafter to the extent such sales, on a
cumulative basis for each holder, exceed 1/3 of our common stock held by such
holder prior to 15 months from the effective date or 2/3 of our common stock
held by such holder prior to 18 months from the effective date. Lancer Offshore
Inc. will be subject to a lock-up agreement which prohibits the sale of all of
its shares in the public market until 180 days after the effective date. There
are presently no agreements between the underwriters and any of our stockholders
or affiliates releasing them from these lock-up agreements prior to the
expiration of the applicable period.

      The underwriters may engage in over-allotment, stabilizing transactions,
syndicate covering transactions, penalty bids and "passive" market making in
accordance with Regulation M under the Securities Exchange Act of 1934.
Over-allotment involves syndicate sales in excess of the offering size, which
creates a syndicate short position. Stabilizing transactions permit bids to
purchase the underlying security so long as the stabilizing bids do not exceed a
specified maximum. Syndicate covering transactions involve purchases of the
shares of common stock or warrants in the open market after the distribution has
been completed in order to cover syndicate short positions. Penalty bids permit
the underwriters to reclaim a selling concession from a syndicate member when
the shares of common stock or warrants originally sold by such syndicate member
are purchased in a syndicate covering transaction to cover syndicate short
positions. In "passive" market making, market makers in the securities who are
underwriters or prospective underwriters may, subject to certain limitations,
make bids for or purchases of the securities until the time, if any, at which a
stabilizing bid is made. These stabilizing transactions, syndicate covering
transactions and penalty bids may cause the price of the common stock to be
higher than they would otherwise be in the absence of these transactions. These
transactions may be effected on the AMEX or otherwise and, if commenced, may be
discontinued at any time.

      In connection with the offering, the underwriters may make short sales of
our shares and may purchase our shares on the open market to cover positions
created by short sales. Short sales involve the sale by the underwriters of a
greater number of shares than they are required to purchase in the offering.
"Covered" short sales are sales made in an amount not greater than the
underwriters' over-allotment option to purchase additional shares in the
offering. The underwriters may close out any covered short position by either
exercising their over-allotment option or purchasing shares in the open market.
In determining the source of shares to close out the covered short position, the
underwriters will consider, among other things, the price of shares available
for purchase in the open market as compared to the price at which they may
purchase shares through the over-allotment option. "Naked" short sales are sales
in excess of the over-allotment option. The underwriters must close out any
naked short position by purchasing shares in the open market. A naked short
position is more likely to be created if the underwriters are concerned that
there might be downward pressure on the price of the shares in the open market
after pricing that could adversely affect investors who purchase in the
offering. Similar to other purchase transactions, the underwriters' purchases to
cover the short sales may have the effect of raising or maintaining the market
price of our common stock or preventing or retarding a decline in the market
price of our common stock. As a result, the price of our common stock may be
higher than the price that might otherwise exist in the open market.

      Prior to this offering, there has been no public market for our common
stock. Consequently, the assumed initial public offering price of our common
stock has been determined by negotiation between us and the underwriters.
Factors considered in determining the public offering price of such stock
included our net worth and earnings, the amount of dilution per share of common
stock to the public investors, the estimated amount of proceeds believed
necessary to accomplish our proposed goals, prospects for our business and the
industry in which we operate, the present state of our activities and the
general condition of the securities markets at the time of the offering.


                                       65


                          TRANSFER AGENT AND REGISTRAR

      The transfer agent and registrar for our common stock is Continental Stock
Transfer & Trust Company. Its address is 17 Battery Place, New York, New York
10004.

                                  LEGAL MATTERS

      Certain legal matters in connection with this offering have been passed
upon for us by Kramer Levin Naftalis & Frankel LLP, New York, New York. Certain
legal matters relating to our patents and patent applications in connection with
this offering will be passed upon for us by Darby & Darby P.C., New York, New
York.

                                     EXPERTS

      Our financial statements as of December 31, 2002 and for the years ended
December 31, 2002 and 2001 and for the period from our inception on April 3,
1997 to December 31, 2002, included in this prospectus and elsewhere in the
registration statement to which this prospectus relates, have been audited by
Grant Thornton LLP, independent certified public accountants, as stated in their
report with respect thereto and are included in this prospectus and elsewhere in
the registration statement in reliance upon the authority of said firm as
experts in accounting and auditing.

      Certain matters dealing with patents set forth in "Risk Factors --
Protecting intellectual property in our technology through patents, If we are
not able to protect our intellectual property..." and "Business -- Intellectual
Property" have been included in this prospectus in reliance upon the written
opinion of Darby & Darby, P.C., New York, New York.

                      DISCLOSURE OF COMMISSION POSITION ON
                 INDEMNIFICATION FOR SECURITIES ACT LIABILITIES

      Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to our directors, officers and controlling persons
pursuant to the foregoing provisions, or otherwise, we have been advised that in
the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by us of expenses incurred or paid by one of
our directors, officers or controlling persons in the successful defense of any
action, suit or proceeding) is asserted by that director, officer or controlling
person in connection with the securities being registered, we will, unless in
the opinion of our counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether that
indemnification by us is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of that issue.

                    WHERE YOU CAN FIND ADDITIONAL INFORMATION

      We have filed a registration statement on Form SB-2 with the Securities
and Exchange Commission relating to the common stock offered by this prospectus.
This prospectus does not contain all of the information set forth in the
registration statement and the exhibits and schedules to the registration
statement. Statements contained in this prospectus concerning the contents of
any contract or other document referred to are not necessarily complete and in
each instance we refer you to the copy of the contract or other document filed
as an exhibit to the registration statement, each such statement being qualified
in all respects by such reference.

      For further information with respect to us and the common stock we are
offering, please refer to the registration statement. A copy of the registration
statement can be inspected by anyone without charge at the public reference room
of the Securities and Exchange Commission, Room 1024, 450 Fifth Street, N.W.,
Washington, D.C. 20549. Please call the Commission at 1-800-SEC-0330 for further
information on the operation of the public reference room. Copies of these
materials can be obtained by mail from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates. The Commission maintains a Web site (http://www.sec.gov) that contains
information regarding registrants that file electronically with the Commission.


                                       66


                          INDEX TO FINANCIAL STATEMENTS

                                  NEPHROS, INC.
                          (A Development Stage Company)

                                                                            Page
                                                                            ----

Report of Independent Certified Public Accountants                           F-2

Financial Statements

     Balance Sheets                                                          F-3

     Statements of Operations                                                F-4

     Statement of Stockholders' Equity (Deficit)                             F-5

     Statements of Cash Flows                                                F-6

     Notes to Financial Statements                                           F-8


                                      F-1


               REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

After the effect of the reverse stock split discussed in Note 10, the
undersigned would be able to render the following audit report.

New York, New York
February 14, 2003

To the Board of Directors and Shareholders of Nephros, Inc.

We have audited the accompanying balance sheet of Nephros, Inc. (a Delaware
corporation in the development stage) as of December 31, 2002, and the related
statements of operations, stockholders equity (deficit) and cash flows for the
years ended December 31, 2002 and 2001 and for the period from inception (April
3, 1997) to December 31, 2002. These financial statements are the responsibility
of the Company's management. Our responsibility is to express an opinion on
these financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Nephros, Inc. as of December
31, 2002, and the results of its operations and its cash flows for the years
ended December 31, 2002 and 2001 and for the period from inception (April 3,
1997) to December 31, 2002 in conformity with accounting principles generally
accepted in the United States of America.

The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern. As discussed in Note 1 to the
financial statements, the Company has suffered recurring losses from operations
and has a stockholders' deficit as well as working capital deficiency that raise
substantial doubt about its ability to continue as a going concern. Management's
plans in regards to these matters are also described in Note 1. The financial
statements do not include any adjustments that might result from the outcome of
this uncertainty.


                                      F-2


                                  Nephros, Inc.
                          (A Development Stage Company)

                                 BALANCE SHEETS



                                                                                     Pro forma
                                                                                     December 31,     December 31,
                                                                                         2002             2002
                                                                                     ------------     ------------
                                                                                      (unaudited)
                                                                                                
ASSETS
Current assets
   Cash and cash equivalents                                                                          $    240,412
   Prepaid expenses and other current assets                                                                12,572
   Deferred IPO and debt issuance costs                                                                    946,000
                                                                                                      ------------
          Total current assets                                                                           1,198,984
Property and equipment, at cost less accumulated depreciation of
   $342,358 and $285,573 in 2002 and 2001, respectively                                                     76,777
Other assets                                                                                                 3,822
                                                                                                      ------------
          Total assets                                                                                $  1,279,583
                                                                                                      ============

LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)

Current liabilities
   Accounts payable and accrued expenses                                                              $    946,226
   Accrued IPO costs                                                                                       833,000
   Loan from related party                                                                                 110,000
   Short-term loan                                                                                         250,000
   Short-term convertible note payable, net of unamortized
     discount of $500,000                                                                                1,250,000
                                                                                                      ------------
           Total current liabilities                                                                     3,389,226
Series B preferred stock, $.001 par value; 2,333,333 shares authorized;
   2,333,333 shares issued and outstanding at December 31, 2001 and December 31,
   2002 - liquidation preference at December 31, 2002 and December 31, 2001 of
   $2,365,676 and $2,227,666, respectively; none
   outstanding on a pro forma basis                                                            --        2,333,000
Series C preferred stock, $.001 par value;  3,140,000 shares
   authorized; 3,137,550 shares issued and outstanding at December 31, 2001 and
   December 31, 2002 - liquidation preference at December 31, 2002 and December
   31, 2001 of $3,576,487 and $3,369,550, respectively; none
   outstanding on a pro forma basis                                                            --        3,552,550

Stockholders' equity (deficit)
   Series A preferred stock, $.001 par value; 4,000,000 shares authorized;
     4,000,000 shares issued and outstanding at December 31, 2002 and December
     31, 2001 - liquidation preference of $5,000,000; none outstanding
     on a pro forma basis                                                                      --            4,000
   Common stock, $.001 par value; 30,000,000 shares authorized;
     1,261,194 shares issued and outstanding at December 31, 2002
     and December 31, 2001; 3,566,950 outstanding on a
     pro forma basis                                                                 $      3,567            1,261
   Additional paid-in capital                                                          12,903,483        7,016,239
   Accumulated deficit from inception                                                 (15,016,693)     (15,016,693)
                                                                                     ------------     ------------
           Total stockholders' equity (deficit)                                        (2,109,643)      (7,995,193)
                                                                                     ------------     ------------

           Total liabilities and stockholders' equity (deficit)                                       $  1,279,583
                                                                                                      ============


The accompanying notes are an integral part of these statements.


                                      F-3


                                  Nephros, Inc.
                          (A Development Stage Company)

                            STATEMENTS OF OPERATIONS



                                                    Period
                                                     From
                                                   Inception           Year ended December 31,
                                                 to December 31,    ------------------------------
                                                      2002              2002              2001
                                                  ------------      ------------      ------------
                                                                             
Revenue - other                                   $    300,000      $         --      $    300,000

Operating expenses
   Research and development                          9,955,645           957,616           737,858
   General and administrative                        4,360,058         1,097,400           652,828
                                                  ------------      ------------      ------------

         Total operating expenses                   14,015,703         2,055,016         1,390,686
                                                  ------------      ------------      ------------

         Loss from operations                      (14,015,703)       (2,055,016)       (1,090,686)
                                                  ------------      ------------      ------------

Other income (expense), net
    Interest expense                                (1,196,000)       (1,196,000)               --
    Interest income                                    173,097               181             5,497
    Forgiveness of indebtedness                        833,793           833,793                --
    Gain on disposal of assets                          30,007                --                --

    Other income                                         6,113                --                --
                                                  ------------      ------------      ------------
                                                      (152,990)         (362,026)            5,497
                                                  ------------      ------------      ------------

         NET LOSS                                  (14,168,693)       (2,417,042)       (1,085,189)

Cumulative preferred dividends and
accretion                                             (848,000)         (365,000)         (314,000)
                                                  ------------      ------------      ------------

         Net loss attributable to
           common stockholders                    $(15,016,693)     $ (2,782,042)     $ (1,399,189)
                                                  ============      ============      ============

Net loss per share -
    Basic and Diluted                                               $      (2.21)     $      (1.11)
                                                                    ============      ============

Weighted-average shares outstanding -
    Basic and Diluted                                                  1,261,194         1,259,957
                                                                    ============      ============

Pro forma per share data (unaudited):
Pro forma net loss per share
    Basic and Diluted                                               $      (0.69)     $      (0.33)
                                                                    ============      ============

Pro forma weighted-average shares outstanding
    Basic and Diluted                                                  3,500,487         3,308,706
                                                                    ============      ============


The accompanying notes are an integral part of these statements.


                                      F-4


                                  Nephros, Inc.
                          (A Development Stage Company)

             STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)



                                     Series A
                                  preferred stock                 Common stock
                             ---------------------------   ---------------------------
                                 Shares         Amount        Shares         Amount
                             ------------   ------------   ------------   ------------
                                                              
Issuance of common
  stock upon inception                 --   $         --      1,236,575   $      1,237
Issuance of preferred
  stock                         4,000,000          4,000             --             --

Net loss                               --             --             --             --
                             ------------   ------------   ------------   ------------

Balance, December 31, 1997      4,000,000          4,000      1,236,575          1,237

Net loss                               --             --             --             --
                             ------------   ------------   ------------   ------------

Balance, December 31, 1998      4,000,000          4,000      1,236,575          1,237

Noncash stock-based
  compensation                         --             --          2,136              2
Collection of stock
  subscription
  receivable                           --             --             --             --
Net loss                               --             --             --             --
                             ------------   ------------   ------------   ------------

Balance, December 31, 1999      4,000,000          4,000      1,238,711          1,239

Noncash stock-based
  compensation                         --             --             --             --
Cumulative preferred
  dividend and accretion               --             --             --             --
Net loss                               --             --             --             --
                             ------------   ------------   ------------   ------------

Balance, December 31, 2000      4,000,000          4,000      1,238,711          1,239

Noncash stock-based
  compensation                         --             --         22,483             22
Cumulative preferred
  dividend and accretion               --             --             --             --
Net loss                               --             --             --             --
                             ------------   ------------   ------------   ------------

Balance, December 31, 2001      4,000,000          4,000      1,261,194          1,261

Issuance of warrants                   --             --             --             --
Noncash stock-based
  compensation                         --             --             --             --
Beneficial conversion and
  warrants issued in
  connection with
  convertible note
  payable                              --             --             --             --
Cumulative preferred
  dividend and accretion               --             --             --             --

Net loss                               --             --             --             --
                             ------------   ------------   ------------   ------------

Balance, December 31, 2002      4,000,000   $      4,000      1,261,194   $      1,261
                             ============   ============   ============   ============


                                  Stock        Additional     Accumulated
                               subscription      Paid-in       loss from
                                receivable       capital       inception         Total
                               ------------    ------------   ------------    ------------
                                                                  
Issuance of common
  stock upon inception         $     (5,500)   $      4,263   $         --    $         --
Issuance of preferred
  stock                          (2,500,000)      4,996,000             --       2,500,000

Net loss                                 --              --       (453,001)       (453,001)
                               ------------    ------------   ------------    ------------

Balance, December 31, 1997       (2,505,500)      5,000,263       (453,001)      2,046,999

Net loss                                 --              --     (1,146,061)     (1,146,061)
                               ------------    ------------   ------------    ------------

Balance, December 31, 1998       (2,505,500)      5,000,263     (1,599,062)        900,938

Noncash stock-based
  compensation                           --             998             --           1,000
Collection of stock
  subscription
  receivable                      2,505,500              --             --       2,505,500
Net loss                                 --              --     (3,484,817)     (3,484,817)
                               ------------    ------------   ------------    ------------

Balance, December 31, 1999               --       5,001,261     (5,083,879)        (77,379)

Noncash stock-based
  compensation                           --           5,000             --           5,000
Cumulative preferred
  dividend and accretion                 --              --       (169,000)       (169,000)
Net loss                                 --              --     (5,582,583)     (5,582,583)
                               ------------    ------------   ------------    ------------

Balance, December 31, 2000               --       5,006,261    (10,835,462)     (5,823,962)

Noncash stock-based
  compensation                           --          59,978             --          60,000
Cumulative preferred
  dividend and accretion                 --              --       (314,000)       (314,000)
Net loss                                 --              --     (1,085,189)     (1,085,189)
                               ------------    ------------   ------------    ------------

Balance, December 31, 2001               --       5,066,239    (12,234,651)     (7,163,151)

Issuance of warrants                     --         430,000             --         430,000
Noncash stock-based
  compensation                           --          20,000             --          20,000
Beneficial conversion and
  warrants issued in
  connection with
  convertible note
  payable                                --       1,500,000             --       1,500,000
Cumulative preferred
  dividend and accretion                 --              --       (365,000)       (365,000)

Net loss                                 --              --     (2,417,042)     (2,417,042)
                               ------------    ------------   ------------    ------------

Balance, December 31, 2002     $         --    $  7,016,239   $(15,016,693)   $ (7,995,193)
                               ============    ============   ============    ============


The accompanying notes are an integral part of this statement.

                                      F-5


                                  Nephros, Inc.
                          (A Development Stage Company)

                            STATEMENTS OF CASH FLOWS



                                              Period
                                               from
                                            inception to      Year ended December 31,
                                            December 31,   ----------------------------
                                               2002            2002            2001
                                           ------------    ------------    ------------
                                                                  
Cash flows from operating activities
   Net loss                                $(14,168,693)   $ (2,417,042)   $ (1,085,189)
   Adjustments to reconcile net loss to
       net cash used in operating activities
       Depreciation and amortization            372,365          56,785          70,466
       Forgiveness of indebtedness             (833,793)       (833,793)             --
       Noncash stock-based compensation          86,000          20,000          60,000
       Amortization of debt discount          1,196,000       1,196,000              --
       Gain on disposal of assets               (30,007)             --              --
       (Increase) decrease in operating
         assets
         Prepaid expenses                       (12,572)         (9,711)          4,094
         Other assets                            (3,822)          7,632           1,690
       Increase (decrease) in operating
         liabilities
         Accounts payable and accrued
         expenses                             2,106,019         173,794          27,351
                                           ------------    ------------    ------------

         Net cash used in operating
           activities                       (11,288,503)      1,806,335        (921,588)
                                           ------------    ------------    ------------

Cash flows from investing activities
   Purchase of property and equipment          (502,487)        (30,779)         (8,807)
   Proceeds from disposal of property
   and equipment                                 83,352              --              --
                                           ------------    ------------    ------------

         Net cash used in investing
           activities                          (419,135)        (30,779)         (8,807)
                                           ------------    ------------    ------------



                                      F-6


                                  Nephros, Inc.
                          (A Development Stage Company)

                      STATEMENTS OF CASH FLOWS (continued)



                                              Period
                                               from
                                            inception to      Year ended December 31,
                                            December 31,   ----------------------------
                                                2002            2002            2001
                                            ------------    ------------    ------------
                                                                   
Cash flows from financing activities
   Proceeds from issuance of preferred
     stock, net                             $  9,097,550    $         --    $         --
   Issuance of common stock                        5,500              --              --
   Paid IPO costs                                (30,000)        (30,000)
   Loan from related party, net                  110,000           5,000         105,000
   Proceeds from issuance of short-term
     loan, net                                   225,000         225,000
   Proceeds from issuance of convertible
     notes payable, net                        2,540,000       1,600,000         940,000
                                            ------------    ------------    ------------

         Net cash provided by financing
           activities                         11,948,050       1,800,000       1,045,000
                                            ------------    ------------    ------------

         Net increase in cash                    240,412          37,114         114,605

Cash, beginning of period                             --         277,526         162,921
                                            ------------    ------------    ------------

Cash, end of period                         $    240,412    $    240,412    $    277,526
                                            ============    ============    ============

Supplemental disclosure of cash flow
  information
Non cash investing and financing
  activities:

Issuance of warrants in connection with
   settlement with a supplier                    400,000         400,000              --
Beneficial conversion and warrants issued
   in connection with issuance of
   short-term convertible notes                1,530,000       1,530,000              --
Cumulative preferred dividend and
   accretion                                     848,000         365,000         314,000
Conversion of Notes payable into
   preferred stock                               940,000              --         940,000


The accompanying notes are an integral part of these statements.


                                      F-7


                                  Nephros, Inc.
                          (A Development Stage Company)

                          NOTES TO FINANCIAL STATEMENTS

NOTE 1 - NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES

      Nature of Operations

      Nephros, Inc. ("Nephros" or the "Company") was founded in 1997 by health
      professionals, scientists and engineers affiliated with Columbia
      University to develop advanced End Stage Renal Disease ("ESRD") technology
      and products that would address both patient treatment needs and the
      clinical and financial needs of the treatment provider. The Company has
      developed three products to deliver an improved hemodiafiltration process
      for ESRD patients. These are the OLpur(TM) MD190, a dialyzer, OLpurTM
      H(2)H(TM), an add-on module designed for use with existing hemodialysis
      machines and controlled by advanced software with a simplified user
      interface, and the OLpur(TM) NS2000 system, a stand-alone
      hemodiafiltration machine and associated filter technology. The Company
      believes these products are significantly more effective than any products
      currently available for ESRD therapy. In its laboratory bench studies, its
      hemodiafiltration products have been shown to remove a range of larger
      toxins, known collectively as "middle molecules" due to their molecular
      weight, more effectively than existing hemodialysis or hemodiafiltration
      methods. These middle molecules are thought to contribute to such
      conditions as malnutrition, impaired cardiac function, carpal tunnel
      syndrome, and degenerative bone disease in the ESRD patient.

      The Company is a development stage company, as defined by Statement of
      Financial Accounting Standards ("SFAS") No. 7, "Accounting and Reporting
      by Development Stage Enterprises," as it continues to devote substantially
      all of its efforts to establishing a new business, and it has not yet
      commenced its planned principal operations. Revenues earned by the Company
      to date are primarily related to consulting services rendered to third
      parties outside of the planned principal operations.

      The accompanying financial statements have been prepared on a going
      concern basis, which contemplates the realization of assets and the
      satisfaction of liabilities in the normal course of business.

      Through December 31, 2002, the Company had incurred development stage
      losses totaling approximately $15 million. At December 31, 2002, the
      Company had minimal cash and cash equivalents to fund short-term working
      capital requirements and had approximately $2.2 million of working capital
      deficiency. The Company's ability to continue as a going concern and its
      future success is dependent upon its ability to raise capital in the near
      future to continue: (1) its research and development efforts, (2) hiring
      and retaining key employees, (3) satisfaction of its commitments and (4)
      the successful development, production and marketing of its products.
      These factors raise substantial doubt about the Company's ability to
      continue as a going concern.

      The Company is actively pursuing additional sources of financing. The
      Company believes that the proceeds from the proposed initial public
      offering (Note 10), will be sufficient to fund the Company's operations
      into the first quarter of 2004. However, there can be no assurance that
      funds from such financings or any alternative financings will be
      available, when required, to permit the Company to realize its business
      plan, or even if such capital is available, that it will be at terms
      favorable to the Company. Additionally, there can be no assurance that the
      Company's efforts to produce a commercially viable product will be
      successful, or that the Company will generate sufficient revenues to
      provide positive cash flows from operations. The financial statements do
      not include any adjustments that might result from the outcome of these
      uncertainties.


                                      F-8


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 1 (continued)

      Pro Forma Presentation

      The unaudited pro forma presentation at December 31, 2002 gives effect to
      the mandatory conversion of all of the convertible preferred stock
      (including accrued preferred dividend) into common stock (see Notes 2 and
      3), upon the completion of the Company's proposed initial public offering
      (see Note 10).

      Use of Estimates in the Preparation of Financial Statements

      The preparation of financial statements in conformity with accounting
      principles generally accepted in the United States of America requires
      management to make estimates and assumptions that affect the reported
      amounts of assets and liabilities and disclosure of contingent assets and
      liabilities at the date of the financial statements and the reported
      amounts of revenues and expenses during the reporting period. Actual
      results could differ from those estimates.

      Concentration of Risk

      Cash and cash equivalents are financial instruments which potentially
      subject the Company to concentrations of credit risk. The Company deposits
      its cash in financial institutions. At times, such deposits may be in
      excess of insured limits. To date, the Company has not experienced any
      impairment losses on its cash and cash equivalents.

      Fair Value of Financial Instruments

      The carrying amounts of cash and cash equivalents, accounts payable and
      debt approximate fair value due to the short-term maturity of these
      instruments.

      Cash and Cash Equivalents

      The Company considers all highly liquid instruments with an original
      maturity of three months or less at the date of purchase to be cash
      equivalents.


                                      F-9


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 1 (continued)

      Property and Equipment

      Property and equipment are stated at cost and are being depreciated over
      the estimated useful lives of the assets, which range between three and
      five years. Research equipment is being depreciated using an accelerated
      method of 200% declining balance. Computer equipment is being depreciated
      using the straight-line method.

      Property and equipment are comprised of the following:

                                                                  December 31,
                                                                      2002
                                                                  ------------

      Research equipment                                           $ 347,969
      Computer equipment                                              65,818
      Furniture & Fixtures                                             5,348
                                                                   ---------
                                                                     419,135

      Less accumulated depreciation                                 (342,358)
                                                                   ---------
                                                                      76,777
                                                                   =========

      Depreciation expense for the years ended December 31, 2002 and 2001 was
      $56,785 and $70,466, respectively.

      Patents

      The Company has filed numerous patent applications with the United States
      Patent and Trademark Office and in foreign countries. All costs and direct
      expenses incurred in connection with patent applications have been
      expensed as incurred.

      Accounting for Long-lived Assets

      In August 2001, the FASB issued SFAS No. 144, "Accounting for the
      Impairment or Disposal of Long-Lived Assets," which was adopted by the
      Company effective January 1, 2002. SFAS No. 144 addresses financial
      accounting and reporting for the impairment of long-lived assets
      (excluding goodwill) or assets to be disposed of. Management has performed
      a review of all long-lived assets and has determined that no impairment of
      the carrying values of its long-lived assets exists as of December 31,
      2002.


                                      F-10


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 1 (continued)

      Stock-based Compensation

      The Company accounts for stock-based compensation to employees under the
      intrinsic-value-based method of accounting prescribed by Accounting
      Principles Board ("APB") Opinion No. 25, "Accounting for Stock Issued to
      Employees," and discloses the effect of the differences which would result
      had the Company applied the fair-value-based method of accounting on a pro
      forma basis, as required by SFAS No. 123, "Accounting for Stock-Based
      Compensation."

      The Company accounts for nonemployee stock-based awards in which goods or
      services are the consideration received for the equity instruments issued
      based on the fair value of the equity instruments issued in accordance
      with the EITF 96-18, "Accounting for Equity Instruments That Are Issued to
      Other Than Employees for Acquiring, or in Conjunction With Selling, Goods
      or Services."

      The Company has elected to continue to account for stock-based
      compensation under APB Opinion No. 25, under which no compensation expense
      has been recognized for stock options granted to employees at fair market
      value. Had compensation expense for stock options granted under the Plan
      been determined based on fair value at the grant dates, the Company's net
      loss and net loss per share for the years ended December 31, 2002 and 2001
      would have been increased to the pro forma amounts shown below.

                                             2002                2001
                                        -------------       -------------

      Net loss
          As reported                   $  (2,417,042)      $  (1,085,189)
          Pro forma                        (2,417,042)         (1,110,189)

      Net loss per share
          As reported                   $       (2.21)      $       (1.11)
          Pro forma                             (2.21)              (1.13)

      Income Taxes

      The Company accounts for income taxes in accordance with SFAS No. 109,
      "Accounting for Income Taxes," which requires accounting for deferred
      income taxes under the asset and liability method. Deferred income taxes
      are recognized for the tax consequences of temporary differences by
      applying enacted statutory tax rates applicable in future years to
      differences between the financial statement carrying amounts and the tax
      basis of existing assets and liabilities.

      Research and Development Costs

      Research and development costs are expensed as incurred.


                                      F-11


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 1 (continued)

      Income (Loss) per Common Share

      Historical -

      In accordance with SFAS No. 128, "Earnings Per Share," net loss per common
      share amounts ("basic EPS") were computed by dividing net loss
      attributable to common stockholders by the weighted-average number of
      common shares outstanding and excluding any potential dilution. Net loss
      per common share amounts assuming dilution ("diluted EPS") were computed
      by reflecting potential dilution from conversion of convertible securities
      and the exercise of stock options and warrants. Common equivalent shares
      of 3,465,282 and 2,561,370 have been excluded from the computation of
      diluted EPS for the years ended December 31, 2002 and 2001, respectively,
      as their effect is antidilutive.

      Pro forma (unaudited) -

      Pro forma net loss per share is calculated assuming conversion of all
      convertible Preferred Stock and accumulated dividends, which convert upon
      the completion of the Company's proposed initial public offering (see Note
      10). The following table reconciles the numerator and denominator for the
      calculation:

                                                       Year Ended December 31,
                                                        2002           2001
                                                     -----------    -----------

      Numerator:
      Net loss attributable to common stockholders   $(2,782,042)   $(1,399,189)
      Preferred dividend and accretion                   365,000        314,000
                                                     -----------    -----------
      Pro forma net loss                             $(2,417,042)   $(1,085,189)
                                                     ===========    ===========

      Denominator:

      Weighted average basic shares outstanding        1,261,194      1,259,957
      Assumed conversion of preferred stock and
      preferred dividend                               2,239,293      2,048,749
                                                     -----------    -----------
      Pro forma weighted average basic shares
      outstanding                                      3,500,487      3,308,706
                                                     ===========    ===========


                                      F-12


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 1 (continued)

Comprehensive Income (Loss)

The Company complies with the provisions of SFAS No. 130, "Reporting
Comprehensive Income," which requires companies to report all changes in equity
during a period, except those resulting from investment by owners and
distributions to owners, for the period in which they are recognized.
Comprehensive income (loss) is the total of net income (loss) and all other
non-owner changes in equity (or other comprehensive income (loss)) such as
unrealized gains or losses on securities classified as available-for-sale,
foreign currency translation adjustments and minimum pension liability
adjustments. Comprehensive income (loss) must be reported on the face of the
annual financial statements. The Company's operations did not give rise to any
material items includable in comprehensive loss, which were not already in net
loss for the years ended December 31, 2002 and 2001. Accordingly, the Company's
comprehensive loss is the same as its net loss for all periods presented.

New Accounting Pronouncements

In July 2002, the FASB issued SFAS No. 146, "Accounting for Costs Associated
with Exit or Disposal Activities." SFAS 146 requires companies to recognize
costs associated with exit or disposal activities when they are incurred rather
than at the date of commitment to an exit or disposal plan. SFAS 146 will be
applied to exit or disposal activities after December 31, 2002 and is not
expected to have a material effect on the Company's financial position or
results of operations.

NOTE 2 - MANDATORILY REDEEMABLE PREFERRED STOCK

During February through April 2000, the Company issued 2,333,333 shares of $.001
par value Series B preferred stock at a price of $0.86 per share for aggregate
proceeds of approximately $2 million. The Series B stockholders are entitled to
a cumulative dividend at the rate of 6% per annum, when, as and if declared by
the Board of Directors, and to a liquidation preference of $0.86 per share plus
any accrued and unpaid dividends. The Series B preferred stock can be converted
at any time to common stock at the conversion price of $3.83 per share and is
automatically converted upon a qualified public offering of the Company, as
defined in the Company's amended and restated certificate of incorporation.


                                      F-13


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 2 (continued)

The Series B preferred stock is redeemable on or at any time after February
2005, at the election of the holders of at least two thirds of the shares of
Series B and Series C preferred stock voting together as a class calculated on
an as converted basis. The redemption price will be equal to the greater of
$0.86 (plus any accrued and unpaid dividends) or the then fair market value per
share of the Series B preferred stock.

Cumulative preferred dividends on Series B preferred stock were $137,000 and
$129,000 for the years ended December 31, 2002 and 2001, respectively.

During May through October 2000, the Company issued 2,197,550 shares of $.001
per value Series C preferred stock at a price of $1.00 per share. The Series C
stockholders are entitled to a cumulative dividend at a rate of 6% per annum,
when, as and if declared by the Board of Directors, and to a liquidation
preference of $1.00 per share plus any accrued and unpaid dividends. The Series
C preferred stock can be converted at any time to common stock at the conversion
price of $4.45 per share and is automatically converted upon a qualified initial
public offering of the Company, as defined in the Company's amended and restated
certificate of incorporation.

The Series C preferred stock is redeemable on or at any time after May 2005, at
the election of the holders of at least two thirds of the shares of Series B and
Series C preferred stock voting together as a class calculated on an
as-converted basis. The redemption price will be equal to the greater of $1.00
(plus any accrued and unpaid dividends) or the then fair market value per share
of the Series C preferred stock.

During March through October 2001, the Company issued convertible notes payable
for aggregate proceeds of $940,000. During June through November 2001, such
notes were converted into an additional 940,000 shares of Series C preferred
stock at a price of $1.00 per share.

Cumulative preferred dividends on Series C preferred stock were $208,000 and
$165,000 for the years ended December 31, 2002 and 2001, respectively.

In connection with the issuance of Series B and C preferred stock, the Company
incurred issuance cost of approximately $100,000. Such cost was recorded as a
reduction in the carrying amount of such preferred stock and is being accreted
over the five-year period to the earliest redemption date. Accretion of
preferred stock issuance cost was $20,000 and $20,000 for the years ended
December 31, 2002 and 2001, respectively.

NOTE 3 - STOCKHOLDERS' EQUITY

In July 1997, the Company issued 4,000,000 shares of $.001 par value Series A
preferred stock at a price of $1.25 per share for aggregate proceeds of
$5,000,000. The Series A stockholders are entitled to voting and dividend rights
equal to common stockholders. The Series A preferred stock has a liquidation
preference of $1.25 per share plus any accrued but unpaid dividends. The Series
A preferred stock can be converted at any time to common stock at the conversion
price of $5.56 and is automatically converted upon the Company's initial public
offering as set forth in the Company's amended and restated certificate of
incorporation.


                                      F-14


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 4 - STOCK-BASED COMPENSATION

In 2000, the Company adopted the Nephros 2000 Equity Incentive Plan (the
"Plan"), under which 1,011,743 shares of common stock have been authorized for
issuance upon exercise of options granted and which may be granted by the
Company. As of December 31, 2002, 411,892 options have been issued to employees.
The options expire December 31, 2009, and vest as follows:

      -     20% of the options are exercisable on grant date

      -     20% of the options are exercisable on the anniversary of the grant
            date until 60% of the options are fully exercisable

      -     20% of the options are exercisable at such a time that a
            hemodiafiltration device is available for use in clinical trials

      -     20% of the options are exercisable at such a time that Nephros, Inc.
            has obtained regulatory approval for use by humans for its
            hemodiafiltration device

As of December 31, 2002, 12,928 options have been issued to nonemployees. Such
options expire December 31, 2006 and vest over four years.

Option activity for the years ended December 31, 2002 and 2001 is summarized as
follows:

                                                                      Weighted-
                                                                       average
                                                                      exercise
                                                      Shares            price
                                                     --------         --------
      Outstanding at December 31, 2000                461,467         $    .40

      Options granted                                      --               --
      Options exercised                                    --               --
      Options canceled                                (29,453)             .40
                                                     --------         --------

      Outstanding at December 31, 2001                432,014              .40

      Options granted                                      --               --
      Options exercised                                    --               --
      Options canceled                                 (7,194)             .40
                                                     --------         --------

      Outstanding at December 31, 2002                424,820         $    .40
                                                     ========         ========

      Exercisable at December 31, 2002                256,831         $    .40
                                                     ========         ========

      At December 31, 2002, there were 586,923 shares available for future grant
      under the Plan.

      The portion of stock options granted to employees which is time-based
      vested (60%) is accounted for as a fixed award. No compensation has been
      recorded on such portion as it had no intrinsic value at the date of
      grant.


                                      F-15


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 4 (continued)

      The portion of stock options granted to employees which vests based on
      performance achievement (40%) is accounted for as a variable award. As
      vesting depends upon discrete events, the measurement date and the expense
      recognition will occur when such targets are achieved. The intrinsic value
      of such options at December 31, 2002 is approximately $1,000,000.

      Options issued to non-employees were valued using the Black-Scholes
      options pricing model. The Company has recorded compensation in the
      amounts of $20,000 and $10,000 for the years ended December 31, 2002 and
      2001, respectively, in connection with options granted to nonemployees.

      The weighted-average fair value of options granted in 2000 is $.27. The
      fair value of each option grant is estimated on the date of grant using
      the Black-Scholes option pricing model with the following weighted-average
      assumptions: risk-free interest rate of 6%; no expected dividend yield;
      expected lives of five years; and expected stock price volatility of 80%.

      The following table summarizes information about stock options outstanding
      at December 31, 2002:



                                                    Options outstanding                         Options exercisable
                                     ------------------------------------------------       ---------------------------
                                        Number             Weighted-                           Number
                                      outstanding           average        Weighted-         exercisable        Weighted-
                                         as of             remaining        average             as of            average
              Range of               December 31,         contractual      exercise         December 31,        exercise
           exercise prices               2002                life            price              2002              price
           ---------------           -------------        -----------     -----------       -------------      --------
                                                                                                
               $0.40                    424,820              6.9              $.40             256,831            $.40



                                      F-16


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 5 - 401(k) PLAN

      The Company has established a 401(k) deferred contribution retirement plan
      which covers all employees. The Plan provides for voluntary employee
      contributions of up to 15% of annual compensation, as defined. The Company
      does not match employee contributions or otherwise contribute to the
      401(k) Plan.

NOTE 6 - COMMITMENTS AND CONTINGENCIES

      Leases

      On July 1, 2002, the Company entered into a noncancelable operating lease
      for the rental of its office and research and development facility, which
      expires on June 30, 2003. The Company also entered into a noncancelable
      operating lease for certain office equipment, which expires in August
      2007. Rent expense for the years ended December 31, 2002 and 2001 totaled
      approximately $77,000 and $73,000 respectively.

      As of December 31, 2002, future net minimum rental payments required under
      operating leases are as follows:

     Year ending December 31,

              2003                              $42,154
              2004                                6,996
              2005                                6,996
              2006                                6,996
              2007                                4,080
                                                -------
                                                $67,222
                                                =======

      License Agreement

      On November 1, 1999, the Company entered into an exclusive license
      agreement (the "Agreement") with the Trustees of Columbia University in
      the City of New York ("Columbia") whereby Columbia granted the Company an
      exclusive right to develop, manufacture, use, sell or lease products or
      services covered by certain patent applications or the patents that may be
      granted on such applications (collectively, the "Licensed Patents")

      In consideration of the license granted under the Agreement, the Company
      shall pay to Columbia: (i) a royalty of one-third of one percent (0.33%)
      on net sales or transfers of all products or services covered by the
      Licensed Patents; and (ii) a royalty of one-third of one percent (0.33%)
      of all lump-sum payments received by the Company on account of the sale or
      transfer of rights in the Licensed Patents, or in the products or services
      covered by the Licensed Patents.

      The Company is required to pay the following milestone payments to
      Columbia in accordance with the following schedule: (i) $2,500 and the
      delivery of 2,136 shares of common stock of the Company within 60 days
      from the date of the Agreement; (ii) $2,500 upon the filing of the first
      Company-sponsored Pre-Market Application ("PMA") or its foreign equivalent
      for the product or services covered by the Licensed Patents, with the
      United States Food and Drug Administration (the "FDA") or its foreign
      equivalent; (iii) $50,000 upon the cumulative net sales or transfers of
      $25,000,000 of all products or services covered by the Licensed Patents;
      and (iv) $125,000 upon the cumulative net sales or transfers of
      $200,000,000 of all products or services covered by the Licensed Patents.


                                      F-17


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 6 (continued)

      As of December 31, 2002, only the first milestone payment was made as the
      Company has not yet met the conditions for the other payments. The Company
      does not anticipate making any further payments under this license
      agreement as it has discontinued the development of any products covered
      by the Licensed Patents.

      In addition, the Agreement provided that the Company shall sponsor
      research at Columbia in an amount of not less than $40,000 per year for a
      period of two (2) years pursuant to a Research Agreement entered into by
      and between the

      Company and Columbia. During the years ended December 31, 2001 and 2000,
      the Company fulfilled such obligation by paying $30,000 and $50,000,
      respectively, pursuant to such Research Agreement.

      Litigation

      The Company may, from time to time, be a party to litigation arising
      during the normal course of business. The Company is currently not a party
      to any litigation.

      Settlement Agreement

      In June 2002, the Company entered into a settlement agreement with one of
      its suppliers. The Company had an outstanding liability to such supplier
      in the amount of approximately $1,900,000. In exchange for a full release
      of this liability, the Company has issued warrants giving the supplier the
      right to purchase 134,899 shares of common stock of the Company for an
      exercise price of $13.34 per share. The warrants are exercisable at any
      time through June 2007. The warrants were valued at $400,000 using the
      Black-Scholes model. In addition, Nephros shall pay the supplier the
      following amounts: (i) the first installment of $300,000 is due upon
      infusion of capital into the Company of at least $500,000 of net cash
      proceeds, after the date of settlement; (ii) a second installment of
      $100,000 is due six months after the first installment is paid; (iii) a
      third installment of $250,000 is due if and when the Company receives net
      cash proceeds of $1,250,000 in connection with a subsequent offering of
      capital stock. In the event the capital raised by the Company after the
      date of settlement is less than the above thresholds, Nephros shall be
      obligated to pay the supplier 20% of the gross proceeds of any capital
      infusion. Accordingly, the Company recorded a gain of approximately
      $850,000 based on such settlement agreement. On August 7, 2002, the
      Company satisfied the first $300,000 installment of the agreement.
      Although the second installment of $100,000 was due on February 7, 2003,
      Plexus has consented to extend the date for its receipt of payment of this
      installment to the date on which the third installment is due.

NOTE 7 - INCOME TAXES

      At December 31, 2002, the Company had Federal, New York State, and New
      York City income tax net operating loss carryforwards of approximately $14
      million each. The Company also has Federal and New York State research tax
      credit carryforwards of approximately $470,000 and $30,000, respectively.
      The Federal net operating loss and tax credit carryforwards will expire in
      2012 - 2022 unless previously utilized.

      Pursuant to Sections 382 and 383 of the Internal Revenue Code, annual use
      of the Company's net operating loss and credit carryforwards may be
      limited if a cumulative change in ownership of more than 50% occurs within
      a three-year period.


                                      F-18


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 7 (continued)

      Significant components of the Company's deferred tax assets as of December
      31, 2002 are shown below:

      Deferred tax assets
          Net operating loss carryforwards                    $ 6,300,000
          Research and development credits                        500,000
                                                              -----------

               Total deferred tax assets                        6,800,000

      Deferred tax liability                                           --

      Valuation allowance for deferred tax assets              (6,800,000)
                                                              -----------

      Net deferred tax assets                                 $        --
                                                              ===========

      A valuation allowance of $6,800,000 has been recognized to offset the
      deferred tax assets as realization of such assets is uncertain.

      The effective tax rate for the years ended December 31, 2002 and 2001 is
      different from the tax benefit that would result from applying the
      statutory tax rates due to the valuation allowance that has been
      recognized.


                                      F-19


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 8 - RELATED PARTY TRANSACTION

      Prior to December 31, 2000, the Company completed three private placements
      of its equity securities (See Notes 2 and 3), in which some of the
      Company's current and former directors and holders of more than 5% of the
      Company's common stock purchased equity securities. The current and former
      directors and holders of more than 5% of the Company common stock who
      purchased equity securities in these private placements purchased equity
      securities on substantially the same terms and conditions as the other
      participants.

      During 2001, the Company had issued convertible notes in the aggregate
      principal amount of $940,000, pursuant to which the Company agreed to pay
      to the holders the principal amount due under each holder's convertible
      note, together with interest on the unpaid principal amount at the rate of
      9% per annum, compounded semi-annually, from the date of the convertible
      note. As of November 30, 2001, all of these notes were converted into an
      aggregate of 940,000 shares of the Company's series C convertible
      preferred stock. Eric A. Rose, M.D. and Donald G. Drapkin, two of the
      Company's directors and holders of more than 5% of the Company common
      stock, Ronald O. Perelman, a holder of more than 5% of the Company common
      stock, and WP Nephros Partners, LLC, which subsequently transferred its
      notes to Cypress Capital Assets, L.P., a beneficial holder of more than 5%
      of the Company common stock, purchased such notes, as set forth below.

                                                          Number of Shares of
                                                          Series C Convertible
                                                            Preferred Stock
                                                             Issueable Upon
                                    Principal Amount         Conversion of
      Name                          of Convertible Note     Convertible Note
      ----                          -------------------     ----------------
      Eric A. Rose, M.D.                  $240,000               240,000
      Donald G. Drapkin                    $50,000                50,000
      Ronald O. Perelman                  $100,000               100,000
      WP Nephros Partners, LLC            $150,000               150,000

      In April 2002, the Company issued convertible notes in the aggregate
      principal amount of $250,000, pursuant to which the Company agreed to pay,
      in August 2002, to the holders the principal amount due under each
      holder's convertible note, together with interest on the unpaid principal
      amount at the rate of 6% per annum, compounded semi-annually, from the
      date of the convertible note. The holders of these notes have since agreed
      to irrevocably convert them into an aggregate of 250,000 shares of the
      Company's series A convertible preferred stock immediately prior to its
      receipt, if ever, of the remaining $1,500,000 due under a subscription
      agreement (see Note 9), or at such earlier time as the holders may elect,
      provided that such shares of series A convertible preferred stock need not
      be issued by the Company until the Company has increased the number of
      authorized shares of series A convertible preferred stock by amending its
      certificate of incorporation. At any time prior to the date of delivery to
      the holders of such shares, the holders may require the Company to issue
      to them, in lieu of such shares, the number of shares of its common stock
      into which such number of shares of series A convertible preferred stock
      is convertible. The holders have accepted the right to receive the
      foregoing shares in full satisfaction of the Company's obligation to repay
      the notes. The Company has also agreed to issue to the holders of these
      notes warrants to purchase an aggregate of 125,000 shares of its series A
      convertible preferred stock, or such shares of its common stock as may be
      issuable upon mandatory conversion of its series A convertible preferred
      stock, at a price of $1.00 per share, to be exercisable through April
      2004, and the Company expects to issue such warrants prior to the
      effectiveness of the proposed initial public offering (see Note 10). Each
      of Eric A. Rose, M.D., Donald G. Drapkin and Ronald O. Perelman purchased
      securities in this transaction, as set forth in the table below.


                                      F-20


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 8 (continued)



                                                              Number of Shares of
                                                              Series A Convertible      Number of Shares of
                                                                Preferred Stock        Series A Convertible
                                                                 Issuable Upon            Preferred Stock
                                     Principal Amount            Conversion of             Issuable Upon
         Name                        of Convertible Note        Convertible Note       Exercise of Warrants
         ----                        -------------------        ----------------       --------------------
                                                                                     
         Eric A. Rose, M.D.                 $75,000                  75,000                   37,500
         Donald G. Drapkin                  $25,000                  25,000                   12,500
         Ronald O. Perelman                 $25,000                  25,000                   12,500


      The Company received unsecured advances from its Chairman of the Board to
      ensure that it met operating needs. The advances are to be repaid when
      sufficient funds become available and bear no interest. At December 31,
      2002, the Company was indebted for $110,000.

NOTE 9 - DEBT

      In April 2002, the Company issued $250,000 in principal amount of 6%
      convertible notes payable due August 2002 (the "Notes"). The Notes are
      convertible into either Series A preferred stock, Series C preferred
      stock, or substantially equivalent capital stock, at a price of $1.00 per
      share. The holders of the Notes have since agreed to irrevocably convert
      them into an aggregate of 250,000 shares of the Company's series A
      convertible preferred stock immediately prior to its receipt, if ever, of
      the remaining $1,500,000 due under a subscription agreement (see below),
      or at such earlier time as the holders may elect, provided that such
      shares of series A convertible preferred stock need not be issued by the
      Company until the Company has increased the number of authorized shares of
      series A convertible preferred stock by amending its certificate of
      incorporation. At any time prior to the date of delivery to the holders of
      such shares, the holders may require the Company to issue to them, in lieu
      of such shares, the number of shares of its common stock into which such
      number of shares of series A convertible preferred stock is convertible.
      The holders have accepted the right to receive the foregoing shares in
      full satisfaction of the Company's obligation to repay the notes. The
      Company has also agreed to issue to the holders of these notes warrants to
      purchase an aggregate of 125,000 shares of its series A convertible
      preferred stock, or such shares of its common stock as may be issuable
      upon mandatory conversion of its series A convertible preferred stock, at
      a price of $1.00 per share, to be exercisable through April 2004, and the
      Company expects to issue such warrants prior to the effectiveness of the
      proposed initial public offering (see Note 10). The warrants were valued
      at $30,000 using the Black-Scholes model and were recorded as a debt
      discount, which was being amortized over the term of the debt (four
      months).


                                      F-21


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 9 (continued)

      In August 2002, the Company entered into a subscription agreement with
      Lancer Offshore, Inc. The subscription agreement provided that Lancer
      Offshore, Inc. would purchase, in three installments, (1) $3,000,000
      principal amount of secured notes due March 15, 2003 convertible into
      1,200,000 shares of common stock of the Company (subject to antidilution
      adjustments) and (2) warrants to purchase until December 2007 an aggregate
      of 240,000 shares of the common stock of the Company at an exercise price
      of $2.50 per share (subject to antidilution adjustments). In accordance
      with the subscription agreement, the first installment of securities,
      consisting of $1,500,000 principal amount of the notes and 120,000 of the
      warrants, was sold. The $1,500,000 note issued in August 2002 contained a
      beneficial conversion of $1,110,000 which was recorded as a debt discount
      and is being amortized over the term of the debt (7.5 months). In
      connection with the issuance of such note, the Company incurred issuance
      costs of approximately $224,000. Such costs are recorded as debt issuance
      costs and are being amortized over the term of the debt (7.5 months). The
      notes were originally to bear interest at the rate of 8% per annum and be
      convertible at any time into up to 1,200,000 shares common stock at a
      price of $2.50 per share (subject to antidilution adjustments). The notes
      were to automatically convert into shares of common stock upon a qualified
      public offering of the Company, as defined in the convertible promissory
      note. The warrants were valued at $390,000 using the Black-Scholes model
      and were recorded as a debt discount, which is being amortized over the
      term of the debt (7.5 months). Lancer Offshore, Inc. did not fund the
      remaining installments. The Company entered into a settlement agreement
      with Lancer Offshore, Inc. dated as of January 31, 2003, pursuant to
      which, among other things, (1) the parties gave mutual releases relating
      to the subscription agreement, (2) Lancer Offshore, Inc. agreed to
      surrender to the Company all of its warrants except a portion thereof
      exercisable to purchase 75,000 shares of common stock of the Company, and
      (3) Lancer Offshore, Inc. agreed to exchange the secured convertible note
      referred to above for an unsecured note in the same principal amount
      bearing no interest, not convertible into common stock, and due on the
      earlier to occur of (i) January 31, 2004 and (ii) seven business days
      after we receive the net proceeds of the initial public offering of the
      Company.

      In April 2002, the Company entered into a letter agreement with Hermitage
      Capital Corporation which, among other things, required it to provide
      Hermitage Capital Corporation with (1) a placement fee of 10% of the total
      amount of funds raised during the term of the letter agreement from
      investors introduced by Hermitage Capital Corporation in a financing
      through the issuance and placement of certain of the Company's equity or
      convertible debt securities, (2) warrants to purchase an amount of shares
      of the Company's common stock equal to 4.166% of any such financing and
      (3) a placement fee of 10% of the total amount of funds raised in any such
      financing successfully consummated during the three years immediately
      following the term of the letter agreement with an investor that was
      introduced to the Company by Hermitage Capital Corporation during the term
      of the letter agreement. The stated term of the letter agreement was from
      April 30, 2002 through September 30, 2004. Pursuant to the terms of the
      letter agreement, the Company paid Hermitage Capital Corporation, as
      placement agent, an aggregate amount of $150,000 in connection with its
      transactions with Lancer Offshore, Inc. in August 2002. The Company has
      entered into a settlement agreement with Hermitage Capital Corporation
      dated as of February 13, 2003 pursuant to which, among other things, (1)
      the letter agreement was terminated, (2) the parties gave mutual releases
      relating to the letter agreement and (3) the Company agreed to issue to
      Hermitage Capital Corporation or its designees, upon the completion of the
      transactions contemplated by the settlement agreement with Lancer
      Offshore, Inc., warrants exercisable until February 2006 to purchase an
      aggregate of 60,000 shares of its common stock at an exercise price of
      $2.50 per share.

      On December 26, 2002, the Company issued two promissory notes in the
      aggregate principal amount of $250,000 (collectively, the "Notes") payable
      on December 26, 2003. Each of the Notes bears an increasing interest rate
      of 7% to 15% per annum and it is mandatorily payable no later then 30 days
      after the consummation of the Company's initial public offering.


                                      F-22


                                  Nephros, Inc.
                          (A Development Stage Company)

                    NOTES TO FINANCIAL STATEMENTS (continued)

NOTE 10 - Subsequant Events

      The Company is pursuing an initial public offering ("IPO") of its common
      stock yielding proceeds to the Company of minimum $15 million before
      taking into account applicable underwriting discounts, commissions and
      offering expenses.

      Prior to the consummation of the initial public offering, the Company will
      effect a reverse stock split pursuant to which each share of its common
      stock will be converted into 0.2248318 of one share of common stock.
      Unless otherwise noted, all shares and per share data for all periods
      presented have been retroactively restated to give effect to this reverse
      stock split.

      In January 2003, the Company's board of directors voted to increase to
      1,124,159 the aggregate number of shares of the Company's common stock
      reserved for issuance under the Plan, subject to the requisite stockholder
      approval.

      In January 2003, the Company granted to certain employees and consultants
      nonqualified stock options to purchase 359,056 shares of common stock at
      an exercise price of $3.50 per share, a portion of which were immediately
      exercisable and the remainder of which will vest over time or upon the
      achievement of certain milestones. Also in January 2003, the Company's
      board of directors approved, subject to shareholder approval of certain
      changes to the Plan, the grant, prior to the consummation of the Company's
      proposed initial public offering, of nonqualified stock options to
      purchase 128,154 shares of common stock at an exercise price of $3.50 per
      share, a portion of which will be immediately exercisable and the
      remainder of which will vest upon the achievement of certain milestones.
      The portion of stock options granted which is time-based vested is
      accounted for as a fixed award and will result in compensation expense of
      approximately $200,000, of which approximately $100,000 was charged to
      operation at the date of grant. The remaining $100,000 will be charged to
      operation throughout the vesting period (3 years). The portion of stock
      options granted to employees which vests based on performance achievement
      is accounted for as a variable award. As vesting depends upon discrete
      events, the measurement date and expanse recognition will occur when such
      targets are achieved. The intrinsic value of such options at the date of
      grant is approximately $600,000. The options granted to consultants were
      valued at approximately $650,000 using Black-Scholes options pricing model
      and will be charged to operations throughout the service period.


                                      F-23


                [INSIDE BACK COVER PAGE - DESCRIPTION OF ARTWORK]

The inside back cover contains a color photograph of the OLpur(TM) NS2000, our
standalone hemodiafiltration machine. The following text appears above the
photograph: "OLpur(TM) NS2000 Our next generation system designed to provide
on-line hemodiafiltration."

The bottom right side of the inside front cover page contains our logo.


                                      F-24


      No dealer, salesman or other person has been authorized to give any
information or to make representations other than those contained in this
prospectus, and if given or made, such information or representations must not
be relied upon as having been authorized by us. Neither the delivery of this
prospectus nor any sale hereunder will, under any circumstances, create an
implication that the information herein is correct as of any time subsequent to
its date. This prospectus does not constitute an offer to or solicitation of
offers by anyone in any jurisdiction in which such an offer or solicitation is
not authorized or in which the person making such an offer is not qualified to
do so or to anyone to whom it is unlawful to make such an offer or solicitation.

                                2,500,000 SHARES

                                  NEPHROS, INC.

                                  COMMON STOCK

                             ----------------------

                                   PROSPECTUS

                             ----------------------

                                 _________, 2003

      You should rely only on the information contained in this document or to
those which we have referred you. We have not authorized anyone to provide you
with any other information. This document may be used only where it is legal to
sell these securities. The information in this document may not be accurate
after the date on its cover.

      Until ______, 200_, all dealers effecting transactions in the registered
securities, whether or not participating in this offering, may be required to
deliver a prospectus. This is in addition to the dealers' obligation to deliver
a prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.


                                      F-25


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 24. Indemnification of Directors and Officers

      Section 145 of the Delaware General Corporation Law (the "DGCL") permits a
corporation, under specified circumstances, to indemnify its directors,
officers, employees or agents against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlements actually and reasonably
incurred by them in connection with any action, suit or proceeding brought by
third parties by reason of the fact that they were or are directors, officers,
employees or agents of the corporation, if such directors, officers, employees
or agents acted in good faith and in a manner they reasonably believed to be in
or not opposed to the best interests of the corporation and, with respect to any
criminal action or proceeding, had no reason to believe their conduct was
unlawful. In a derivative action, that is one by or in the right of the
corporation, indemnification may be made only for expenses actually and
reasonably incurred by directors, officers, employees or agents in connection
with the defense or settlement of an action or suit, and only with respect to a
matter as to which they will have acted in good faith and in a manner they
reasonably believed to be in or not opposed to the best interests of the
corporation, except that no indemnification will be made if such person will
have been adjudged liable to the corporation, unless and only to the extent that
the court in which the action or suit was brought will determine upon
application that the defendant directors, officers, employees or agents are
fairly and reasonably entitled to indemnity for such expenses despite such
adjudication of liability.

      The Registrant's Amended and Restated Certificate of Incorporation
provides for indemnification of directors and officers of the Registrant to the
fullest extent permitted by the DGCL. The Registrant has obtained liability
insurance for each director and officer for certain losses arising from claims
or charges made against them while acting in their capacities as directors or
officers of the Registrant.

Item 25. Other Expenses of Issuance and Distribution.

The Registrant estimates that expenses payable by the Registrant in connection
with the offering described in this Registration Statement will be as follows:

                                                                          Total
                                                                          -----

SEC registration fee (actual) ........................................$1,851.50
NASD filing fee.......................................................$2,512.50
Accounting fees and expenses .......................................$500,000.00
American Stock Exchange LLC listing fee...............................$5,000.00
Legal fees and expenses.............................................$600,000.00
Printing and engraving expenses......................................$75,000.00
Blue Sky fees and expenses...........................................$10,000.00
Directors and officers' insurance....................................$50,000.00
Transfer agent and registrar fees.....................................$5,000.00
Miscellaneous expenses...............................................$25,636.00

Item 26. Recent Sales of Unregistered Securities

      The number of shares of the Registrant's Common Stock, par value $.001 per
share ("Common Stock"), set forth below have been adjusted to reflect the
Registrant's reverse stock split to be completed prior to the effectiveness of
this Registration Statement. See the description under the heading "Description
of Securities -- Reverse Stock Split" in Part I of this Registration Statement.


                                      II-1


      On November 1, 1999, the Registrant issued to the Trustees of Columbia
University in the City of New York 2,136 shares of Common Stock in connection
with a licensing agreement between the Registrant and the Trustees of Columbia
University in the City of New York.

      As of February 8, 2000, the Registrant issued to WPPN, LP (formerly, WPPN,
Inc.) and NEP Employee Partners LLC 1,866,666 and 466,667 shares, respectively,
of its Series B Convertible Preferred Stock, par value $.001 per share, for an
aggregate purchase price of $2,006,666. Each of WPPN, LP and NEP Employee
Partners LLC are controlled by Cypress Capital Assets, LP.

      As of May 17, 2000, the Registrant issued 2,197,550 shares of its Series C
Convertible Preferred Stock, par value $.001 per share ("Series C Preferred
Stock"), for an aggregate purchase price of $2,197,550, to Donald G. Drapkin,
William J. Fox, Ronald Perelman, Eric A. Rose, Lindsay Rosenwald, Bruce J.
Wasserstein, and WP Nephros Partners, LLC (which subsequently transferred its
shares to Cypress Capital Assets, L.P.), and certain other existing and new
investors.

      During March through October 2001, the Registrant issued 940,000 shares of
Series C Preferred Stock for an aggregate purchase price of $940,000, to Donald
G. Drapkin, Ronald Perelman; Eric A. Rose and WP Nephros Partners, LLC (which
subsequently transferred its shares to Cypress Capital Assets, L.P.), and
certain other existing and new investors.

      In April 2002, the Registrant issued convertible promissory notes in the
principal amount of $250,000 to the following investors: Donald G. Drapkin,
Ronald Perelman and Eric A. Rose, and certain other existing and new investors.
In connection with this April 2002 issuance, the Registrant has agreed to issue
to the holders of these notes warrants to purchase an aggregate of 125,000
shares of the Registrant's Series A Convertible Preferred Stock, par value $.001
per share (the "Series A Preferred Stock"), or such shares of Common Stock as
may be issuable upon mandatory conversion of the Series A Preferred Stock, at a
conversion price of $1.00 per share, which warrants expire in April 2004.

      In June 2002, in settlement of certain amounts owed by the Registrant to
Plexus Services Corp., a former supplier of engineering consulting services, the
Registrant issued warrants to purchase 134,899 shares of Common Stock at an
exercise price of $13.34 per share, which warrants expire in June 2007.

      In August 2002, the Registrant issued to Lancer Offshore, Inc. a
convertible note in the principal amount of $1,500,000 and warrants to purchase
120,000 shares of common stock (subject to antidilution adjustments; see
"Business--Settlement Agreements"). In connection with this transaction, the
Registrant entered into a Subscription Agreement with Lancer Offshore, Inc.,
which contemplated that additional convertible notes in the aggregate principal
amount of $1,500,000 and warrants to purchase an additional 120,000 shares of
common stock (subject to antidilution adjustments) would be issued, subject to
the payment of the additional aggregate principal amount of $1,500,000. However,
Lancer Offshore, Inc. did not fund the remaining $1,500,000. The Registrant has
entered into a settlement agreement with Lancer Offshore, Inc. dated as of
January 31, 2003, pursuant to which (1) the parties executed mutual releases
relating to the subscription agreement, (2) Lancer Offshore, Inc. agreed to
reduce the number of shares of common stock issuable upon exercise of its
warrants to 75,000, and (3) Lancer Offshore, Inc. released its rights under the
secured convertible note referred to above, agreeing to accept in lieu thereof
an unsecured note in the same principal amount bearing no interest, not
convertible into common stock, and due on the earlier to occur of (i) January
31, 2004 and (ii) seven business days after we receive the net proceeds of this
offering. See "Business -- Settlement Agreements" of the prospectus to which
this registration statement relates. In connection with the $1,500,000
convertible note issued to Lancer Offshore, Inc., the Company paid an aggregate
commission of $150,000.

      Pursuant to our settlement agreement dated as of February 13, 2003 with
Hermitage Capital Corporation, we expect to issue to Hermitage Capital
Corporation warrants to purchase 60,000 shares of our common stock (subject to
antidilution adjustments). See "Business -- Settlement Agreements" of the
prospectus to which this registration statement relates.

      In December 2002, we issued promissory notes in the aggregate principal
amount of $250,000 to two lenders. Each of these loans is payable on the earlier
to occur of 30 days after the consummation of this offering and December 26,
2003. Each of these loans bears interest, calculated quarterly in arrears, at a
rate of 7% per annum from December 26, 2002 to March 31, 2003, 10% per annum
from April 1, 2003 to April 30, 2003, and 15% per annum from May 1, 2003 to
December


                                      II-2


26, 2003. In connection with these loans, we paid Hermitage Capital Corporation,
as placement agent, an aggregate amount of $25,000.

      The issuances of the above securities were considered to be exempt from
registration under the Securities Act in reliance on Section 4(2) of the
Securities Act, or Regulation D promulgated thereunder, as transactions by an
issuer not involving a public offering. The recipients of securities in each of
these transactions represented their intention to acquire the securities for
investment only and not with a view to or for sale in connection with any
distribution thereof and appropriate legends were affixed to the share
certificates and other instruments issued in these transactions. All recipients
either received adequate information about us or had access to such information.

Item 27. Exhibits.

                                  EXHIBIT INDEX

1.1**       Form of Underwriting Agreement.

3.1**       Amended and Restated Certificate of Incorporation of the Registrant.

3.2**       Amended and Restated By-laws of the Registrant.

4.1**       Specimen of Common Stock Certificate of the Registrant.

4.2**       Form of Underwriter's Warrant.

5.1**       Opinion of Kramer, Levin, Naftalis & Frankel LLP.

5.2**       Opinion of Darby & Darby P.C.

10.1*       Amended and Restated 2000 Nephros Equity Incentive Plan.

10.2*       Form of Subscription Agreement dated as of June 1997 between the
            Registrant and each Purchaser of Series A Convertible Preferred
            Stock.

10.3*       Form of Registration Rights Agreement dated as of February 8, 2000
            between the Registrant and WP Nephros Partners, LLC, as Purchaser of
            Series B Convertible Preferred Stock.

10.4*       Form of Registration Rights Agreement dated as of May 17, 2000
            between the Registrant and each Purchaser of Series C Convertible
            Preferred Stock.

10.5**      Form of Warrant dated April 8, 2002 issued to each Holder of Certain
            Convertible Promissory Notes of the Registrant.

10.6**      Form of Warrant to be issued to Lancer Offshore, Inc. pursuant to
            the Settlement Agreement dated as of January 31, 2003 between Lancer
            Offshore, Inc. and the Registrant.

10.7        Form of Promissory Note dated as of December 26, 2002 issued to
            Joseph Giamanco by the Registrant.

10.8*       Employment Agreement dated as of July 1, 2002 between Norman Barta
            and the Registrant.

10.9*       Form of Employee Patent and Confidential Information Agreement.

10.10*      Form of Employee Confidentiality Agreement.

10.11       Settlement Agreement dated June 19, 2002 between Plexus Services
            Corp. and the Registrant

10.12       Settlement Agreement dated as of January 31, 2003 between Lancer
            Offshore, Inc. and the Registrant.

10.13       Form of Promissory Note dated as of February __, 2003 issued to
            Lancer Offshore, Inc. by the Registrant.

10.14       Settlement Agreement dated as of February 13, 2003 between Hermitage
            Capital Corporation and the Registrant.


                                      II-3


10.15       Form of Warrant to be issued to Hermitage Capital Corporation or its
            designees pursuant to the Settlement Agreement dated as of February
            13, 2003 between Hermitage Capital Corporation and the Registrant.

10.16       Lease Agreement dated as of July 1, 2002 between the Trustees of
            Columbia University in the City of New York and the Registrant.

10.17       Form of Promissory Note dated as of December 26, 2002 issued to
            George Hatsopoulis by the Registrant.

23.1        Consent of Grant Thornton LLP.

23.2**      Consent of Kramer, Levin, Naftalis & Frankel LLP (included in its
            opinion filed as Exhibit 5.1 hereto).

23.3**      Consent of Darby & Darby P.C. (included in its opinion filed as
            Exhibit 5.1 hereto).

24.1*       Power of Attorney.


- ----------
*     Previously filed.

**    To be filed by amendment.

Item 28. Undertakings.

The undersigned Registrant hereby undertakes:

(1)   To file, during any period in which offers or sales are being made, a
      post-effective amendment to this Registration Statement:

      i.    To include any prospectus required by Section 10(a)(3) of the
            Securities Act;

      ii.   To reflect in the prospectus any facts or events which, individually
            or together, represent a fundamental change in the information in
            the Registration Statement; and notwithstanding the foregoing, any
            increase or decrease in volume of securities offered (if the total
            dollar value of securities offered would not exceed that which was
            registered) and any deviation from the low or high end of the
            estimated maximum offering range may be reflected in the form of
            prospectus filed with the Commission pursuant to Rule 424(b) if, in
            the aggregate, the changes in the volume and price represent no more
            than a 20% change in the maximum aggregate offering price set forth
            in the "Calculation of Registration Fee" table in the effective
            Registration Statement; and

      iii.  To include any additional or changed material information on the
            plan of distribution;

      provided, however, that clauses (i) and (ii) do not apply if the
      Registration Statement is on Form S-3 or Form S-8, and the information
      required to be included in a post-effective amendment by such clauses is
      contained in periodic reports filed with or furnished to the Commission by
      the Registrant pursuant to Section 13 or 15(d) of the Securities Exchange
      Act of 1934 that are incorporated by reference in the Registration
      Statement;

(2)   That, for the purpose of determining any liability under the Securities
      Act, each such post-effective amendment shall be deemed to be a new
      registration statement relating to the securities offered therein, and the
      offering of such securities at that time shall be deemed to be the initial
      bona fide offering thereof;

(3)   To remove from registration by means of a post-effective amendment any of
      the securities being registered which remain unsold at the termination of
      the offering.


                                      II-4


                                   SIGNATURES

      In accordance with the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form SB-2 and authorized this registration
statement to be signed on its behalf by the undersigned, in the City of New
York, State of New York, on February 28, 2003.


                              By: /s/ Norman J. Barta
                                  --------------------------------------------
                                  Norman J. Barta
                                  President, Chief Executive Officer and Chief
                                  Financial Officer

      Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated.


Signature                    Title                          Date
- ---------                    -----                          ----


/s/ Norman J. Barta          President, Chief Executive     February 28, 2003
- -------------------          Officer, Chief Financial
Norman J. Barta              Officer, Principal
                             Accounting Officer and
                             Director


/s/ Eric A. Rose, M.D.*      Chairman of the Board of       February 28, 2003
- -----------------------
Eric A. Rose, M.D.           Directors and Director


/s/ Lawrence J. Centella *   Director                       February 28, 2003
- --------------------------
Lawrence J. Centella


/s/ Donald G. Drapkin*       Director                       February 28, 2003
- ----------------------
Donald G. Drapkin


W. Townsend Ziebold, Jr.*    Director                       February 28, 2003
- -------------------------
W. Townsend Ziebold, Jr.


*By: /s/ Norman J. Barta
     --------------------
        Norman J. Barta
        Attorney-in-Fact


                                      II-5


                                  EXHIBIT INDEX

1.1**       Form of Underwriting Agreement.

3.1**       Amended and Restated Certificate of Incorporation of the Registrant.

3.2**       Amended and Restated By-laws of the Registrant.

4.1**       Specimen of Common Stock Certificate of the Registrant.

4.2**       Form of Underwriter's Warrant.

5.1**       Opinion of Kramer, Levin, Naftalis & Frankel LLP.

5.2**       Opinion of Darby & Darby P.C.

10.1*       Amended and Restated 2000 Nephros Equity Incentive Plan.

10.2*       Form of Subscription Agreement dated as of June 1997 between the
            Registrant and each Purchaser of Series A Convertible Preferred
            Stock.

10.3*       Form of Registration Rights Agreement dated as of February 8, 2000
            between the Registrant and WP Nephros Partners, LLC, as Purchaser of
            Series B Convertible Preferred Stock.

10.4*       Form of Registration Rights Agreement dated as of May 17, 2000
            between the Registrant and each Purchaser of Series C Convertible
            Preferred Stock.

10.5**      Form of Warrant dated April 8, 2002 issued to each Holder of Certain
            Convertible Promissory Notes of the Registrant.

10.6**      Form of Warrant issuable to Lancer Offshore, Inc. pursuant to the
            Settlement Agreement dated as of January 31, 2003 between Lancer
            Offshore, Inc. and the Registrant.

10.7        Form of Promissory Note dated as of December 26, 2002 issued to
            Joseph Giamanco by the Registrant.

10.8*       Employment Agreement dated as of July 1, 2002 between Norman Barta
            and the Registrant.

10.9*       Form of Employee Patent and Confidential Information Agreement.

10.10*      Form of Employee Confidentiality Agreement.

10.11       Settlement Agreement dated June 19, 2002 between Plexus Services
            Corp. and the Registrant

10.12       Settlement Agreement dated as of January 31, 2003 between Lancer
            Offshore, Inc. and the Registrant.

10.13       Form of Promissory Note dated as of February __, 2003 issued to
            Lancer Offshore, Inc. by the Registrant.

10.14       Settlement Agreement dated as of February 13, 2003 between Hermitage
            Capital Corporation and the Registrant.

10.15       Form of Warrant to be issued to Hermitage Capital Corporation or its
            designees pursuant to the Settlement Agreement dated as of February
            13, 2003 between Hermitage Capital Corporation and the Registrant.

10.16       Lease Agreement dated as of July 1, 2002 between the Trustees of
            Columbia University in the City of New York and the Registrant.

10.17       Form of Promissory Note dated as of December 26, 2002 issued to
            George Hatsopoulis by the Registrant.

23.1        Consent of Grant Thornton LLP.


                                      II-6


23.2**      Consent of Kramer, Levin, Naftalis & Frankel LLP (included in its
            opinion filed as Exhibit 5.1 hereto).

23.3**      Consent of Darby & Darby P.C. (included in its opinion filed as
            Exhibit 5.1 hereto).

24.1*       Power of Attorney.

- ----------
*     Previously filed.

**    To be filed by amendment.


                                      II-7