EXHIBIT 13
                             IONICS, INCORPORATED
                       ANNUAL REPORT TO STOCKHOLDERS OF
                         IONICS, INCORPORATED FOR THE
                      FISCAL YEAR ENDED DECEMBER 31, 1993

              (Only pages 17 through 32 and the inside back cover
                      constitute an Exhibit to Form 10-K)
                                                       














































/48



     MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
     RESULTS OF OPERATIONS
     
     Results of Operations 
     
     
        In 1993, Ionics continued to improve its financial performance
     with a 13% growth in revenues and a 6% improvement in earnings
     per share. The profit improvement was driven primarily by the
     continued success of "own and operate" and service-based
     activities relating to the Water and Chemical Supply and Consumer
     Water Products business segments which combined to produce an
     improvement over 1992 in earnings before interest and taxes of
     42%. This improvement more than offset a decline in the
     profitability of the Membranes and Related Equipment segment
     which was caused primarily by a slowdown in bookings and the
     acceptance and execution of orders at lower than normal margins.
     
        Total revenues were $175.3 million in 1993, compared with
     $155.2 million in the prior year. Revenues increased for all
     business segments with the largest growth in the Membranes and
     Related Equipment segment. Revenue growth in this segment was due
     to sales of ultrapure water systems, particularly to the
     semiconductor industry. A portion of the increase in 1993
     revenues was attributable to the acquisition of the French
     subsidiary, Eau et Industrie, in December 1992, and Resources
     Conservation Company (RCC) in December 1993. Revenues from the
     Water and Chemical Supply business segment increased as large
     Company-owned plants, which commenced operations in the first
     quarter of 1992, operated for the entire period in 1993, and as
     domestic chemicals sales grew. Consumer Water Products revenues
     increased with the further development of the bottled water
     business and the consolidation of Aqua Cool Enterprises, Inc.
     (ACE), our domestic distributor, as of May 26, 1993. The
     increases in domestic equipment revenues, the expansion of the
     domestic chemical business, and the additions of ACE and RCC were
     responsible for the 21% growth in the U.S. geographic segment. 
     
        Total revenues were $155.2 million in 1992, compared with
     $138.1 million in the prior year. The primary reason for the
     growth in 1992 over 1991 was the Company's increased investment
     in own and operate facilities, including those brought on line
     for the City of Santa Barbara and for the Diablo Canyon Power
     Plant of Pacific Gas and Electric. These facilities were also
     primarily responsible for the 48% growth in revenues of the Water
     and Chemical Supply business segment and the 20% growth in
     revenues of the U.S. geographic segment. The Membranes and
     Related Equipment segment realized a 6% sales increase in 1992
     primarily due to sales of membrane systems for water and food
     processing applications. The Consumer Water Products segment's
     1992 revenues declined 9% from 1991. This decline was largely
     caused by reduced sales of our HYgeneR silver-impregnated
     activated carbon filtering media to our largest HYgene customer
     due to depressed economic conditions. 
/49


     
     
        Cost of sales as a percentage of revenues were 66.8%, 64.4%,
     and 65.4% in 1993, 1992 and 1991, respectively. Cost of sales as
     a percentage of revenues increased for the Membranes and Related
     Equipment segment while it held steady or declined for the Water
     and Chemical Supply and the Consumer Water Products segments,
     respectively. The increase in the Membranes and Related Equipment
     segment reflected greater than anticipated costs on several
     sizable capital equipment sales. The Consumer Water Products
     segment showed an improvement in the cost of sales percentage
     primarily due to a steady decline in the Company's unit costs to
     manufacture and distribute bottled water and coolers resulting
     from significant increases in volume, route density and operating
     efficiencies. 
     
     
        The improvement in 1992 compared to 1991 was due primarily to
     reduced costs as a percentage of sales for membrane-based
     equipment and bottled water products. Water and Chemical Supply
     costs as a percentage of sales increased partially because of
     start-up costs and initial excess capacity in connection with the
     Company's expansion of its Elite Chemicals New England plant, and
     because nearly all of the costs associated with the Santa
     Barbara desalination plant are classified as cost of product,
     resulting in superior operating margins but below average gross
     margins. 
     
     
        Operating expenses as a percentage of revenues were 23.5% in
     1993, down from 26.1% in 1992 and 27.2% in 1991. The improvement
     in 1993 reflected the absorption of relatively fixed operating
     expenses by increased sales volume, with further reductions
     achieved through expense controls. The decrease in 1992 compared
     to 1991 reflected the low operating expenses associated with
     large own and operate facilities. 
     
     
        Interest income in 1993 was $1.8 million compared to $2.1
     million in 1992 and $1.5 million in 1991. The decrease in 1993
     was due to lower average interest rates combined with reduced
     investments as a result of the 1993 purchase of ACE's preferred
     stock, the 1992 acquisitions, and additions to property, plant
     and equipment. The increase in 1992 compared to 1991 reflected
     higher average invested balances due to the remaining proceeds of
     the Company's public offerings of common stock in 1992 and 1991.
     The Company had virtually no interest expense in either 1993 or
     1992 after interest expense of $1.4 million in 1991. This
     decrease primarily resulted from the repayment of debt with
     public offering proceeds and cash from operations. 
/50

     
     
        The Company's effective tax rate was 30% in 1993, 29% in 1992
     and 28% in 1991. The increase in the effective tax rate for both
     1993 and 1992 was largely due to changes in the mix of earnings
     and effective tax rates among the different jurisdictions in
     which the Company operates, as well as a proportionately lower
     benefit from the Company's foreign sales corporation. The
     increase in 1992 was partially offset by a benefit from tax-
     exempt interest and a lower state tax rate due to proportionately
     lower domestic income.
     
     
        Net income increased 7.7% to $13.8 million in 1993 compared to
     $12.8 million in 1992. Net income in 1992 was 54.9% higher than
     1991 net income of $8.3 million. Net income as a percentage of
     revenues was 7.9% in 1993 compared to 8.3% in 1992 and 6.0% in
     1991. 
     
     
        The Company adopted Financial Accounting Standards Board
     (FASB) Statement No. 109 " Accounting for Income Taxes" for the
     year 1993, with no material effect on its financial statements. 
     
     LEGAL PROCEEDINGS 
     
        The Company has been named as one of many potentially
     responsible parties (PRPs) in connection with two Superfund
     sites. During 1992, the Company paid $381,000 to the settlement
     trust fund for the Silresim Site in Lowell, Massachusetts. The
     Company was also notified during 1992 that it is one of more than
     1,000 PRPs at a Superfund site in Southington, Connecticut. The
     Company's volumetric share at this site is just under 0.5%, and a
     remediation plan has not yet been adopted. 
     
     
        The Company's volumetric contribution at these sites is low
     and there are many PRPs that are larger, financially sound
     corporations with higher volumetric levels. The Company accrues
     for estimated expenses as facts become known during these
     proceedings. Based upon facts presently known, management
     believes that the Company's liability in connection with these
     sites will not have a material adverse impact on its results of
     operations or financial condition. 
/51


     
        FINANCIAL CONDITION 
     
        At December 31, 1993, the Company had total assets of $249.6
     million compared to total assets of $224.6 million at December
     31, 1992 and $178.0 million at December 31, 1991. The major
     components of the increase in 1993 related to: (1) the
     consolidation of ACE in May 1993 and the acquisition of RCC in
     December 1993, and (2) expenditures for property, plant and
     equipment primarily relating to expansions of the Company's
     bleach production and distribution operations; bottled water
     operations; and triple-membrane trailers for the production of
     ultrapure water. The major components of the 1992 increase were:
     property, plant and equipment, due to expenditures for the
     California projects for the City of Santa Barbara and the Diablo
     Canyon Power Plant; triple membrane ultrapure water trailers; and
     the expansion of the Company's bleach business. In addition, cash
     and short-term investments increased due to the Company's
     February 1992 public offering of common stock. 
     
     
        Working capital in 1993 decreased by $14.4 million and the
     Company's current ratio decreased to 2.4 in 1993 from 3.6 in
     1992. Capital expenditures totaled $14.7 million, $24.7 million,
     and $34.9 million in 1993, 1992 and 1991, respectively. Cash paid
     for the 1993 purchase of ACE's preferred stock and 1992
     acquisitions, net of cash acquired, was $8.0 million and $2.4
     million, respectively. Funds for these expenditures were provided
     in 1993 through cash from operations and the sale of short-term
     investments and in 1992 through the sale of common stock and cash
     from operations. 
     
     
        Net cash generated by operating activities decreased by $2.3
     million in 1993 with higher net income and depreciation offset by
     increases in operating assets, primarily in accounts receivable,
     and decreases in liabilities primarily in accounts payable and
     accrued expenses, excluding those obtained through the
     consolidation of ACE and acquisition of RCC.  Net cash used by
     investing activities decreased by $52.2 million in 1993 as
     compared to 1992. During 1993, cash used for investments in
     property, plant and equipment and for the purchase of ACE's
     preferred stock was funded primarily by the sale of short- term
     investments and partially by cash provided by operations. In
     1992, purchases of short-term investments were funded primarily
     by the sale of common stock and partially by cash provided by
     operations. In 1993, net cash provided by financing activities
     decreased by $47.7 million as no public offering of common stock
     occurred in 1993. During 1992, cash of $54.0 million was provided
     from the sale of common stock. Net payments of debt decreased to
     $0.9 million in 1993 compared to $7.4 million in 1992. 
/52

     
     Significant expenditures in 1994 will include: payment for the
     purchase of RCC; capital for ultrapure water trailers; expansion
     of the bottled water and bleach businesses; and improvements to
     manufacturing equipment. The Company maintains several lines of
     credit, including unused domestic lines totaling $35 million,
     which are available to meet working capital needs. In addition,
     the Company has several facilities to accommodate its foreign
     trade and exchange requirements. The Company believes that its
     cash and short-term investments of $30.1 million at the beginning
     of 1994, cash from operations, lines of credit and foreign
     exchange facilities are adequate to meet its currently
     anticipated needs. 
     
     
        Inflationary increases in material and labor costs remained
     moderate during the last three years , and to the extent
     permitted by the competitive environment, the Company has raised
     prices to cover those inflationary increases. 











































/53

  
  Consolidated Statements of Operations Ionics, Incorporated
  

  For the years ended December 31 
  Dollars in thousands, except 
    per share amounts                        1993        1992        1991
                                                           
  
  Net revenue :
    Membranes and related equipment         $ 92,352    $ 81,019    $ 76,267
    Water and chemical supply                 51,513      46,698      31,491
    Consumer water products                   31,408      27,523      30,362
                                             175,273     155,240     138,120
  
  Costs and expenses:
    Cost of membranes and related equipment   65,890      52,352      51,610
    Cost of water and chemical supply         36,035      32,594      21,312
    Cost of consumer water products           15,078      14,985      17,387
    Research and development                   3,678       3,084       2,886
    Selling, general and administrative       37,432      37,409      34,743
                                             158,113     140,424     127,938
  
  Income from operations                      17,160      14,816      10,182
  Interest income                              1,789       2,092       1,491
  Interest expense                                 -          (5)     (1,436)
  Equity income                                  775       1,281       1,412
  Income before income taxes    
    and minority interest                     19,724      18,184      11,649
  Provision for income taxes                   5,917       5,273       3,262
  Income before minority interest             13,807      12,911       8,387
  Minority interest's share of income              -         (91)       (109)
  
  Net income                                $ 13,807    $ 12,820    $  8,278
  
  Earnings per share                        $   1.96    $   1.85    $   1.45 
  Shares used in earnings per    
    share calculations                      7,060,000    6,919,000  5,703,000
  
  
  
  
  
  The accompanying notes are an integral part of these financial statements.

/54

  
  Consolidated Balance Sheets              Ionics, Incorporated
  

  
  December 31 
  Dollars in thousands                       1993           1992 
                                                    
    Assets 
    Current assets:
    Cash and cash equivalents              $ 21,534       $ 13,535
    Short-term investments                    8,603         28,281
    Notes receivable, current                 2,505          3,195
    Accounts receivable                      57,214         43,640
    Receivables from affiliated companies     2,944          4,096
    Inventories                              13,926         12,314
    Other current assets                      3,231          3,696
  
      Total current assets                  109,957        108,757 
  
  Notes receivable, long-term                 4,919         10,156 
  Investments in affiliated companies         4,989          4,279 
  Property, plant and equipment, net        100,445         97,801
  Other assets                               29,252          3,597
  
      Total assets                         $249,562       $224,590 
  
  Liabilities and Stockholders' Equity 
  Current liabilities:
    Notes payable and current 
      portion of long-term debt            $    326       $    975
    Accounts payable                         12,496         12,272
    Other current liabilities                32,332         16,060
    Taxes on income                             928          1,192
  
      Total current liabilities              46,082         30,499 
  
  Long-term debt and notes payable              109            439 
  
  Deferred income taxes                       2,699          2,777 
  Other liabilities                             591            535 
  Commitments                                     -              -
  
  Stock holders' equity:
      Common stock, par value $1, authorized shares: 
      30,000,000 in 1993 and 1992; 
      issued: 6,945,805 in 1993 and 
        6,908,513 in 1992                     6,946          6,909
      Additional paid-in capital            124,189        123,148
      Retained earnings                      75,574         61,767
      Cumulative translation adjustments     (6,628)        (1,484)
  
      Total stockholders' equity            200,081        190,340
      Total liabilities and 
         stockholdersU equity              $249,562       $224,590
  
  The accompanying notes are an integral part of these financial statements. 

/55

  
  Consolidated Statements of Cash Flows              Ionics, Incorporated

  
  For the years ended December 31 
  Dollars in thousands                                 1993       1992       1991
                                                                  
  Operating activities:                              
    Net income                                       $ 13,807   $ 12,820   $  8,278
    Adjustments to reconcile net income to net cash
    provided by operating activities:
      Depreciation and amortization                    15,463     12,588      8,530
      Provision for losses on accounts 
        and notes receivable                              390        944        923
    Deferred income tax provision (benefit)             1,589        562       (571)
    Changes in assets and liabilities, net of effects
    of businesses acquired:
      Notes receivable                                 (1,175)    (2,699)    (2,489)
      Accounts receivable                              (7,332)    (2,209)    (5,989)
      Inventories                                      (1,509)      (748)     2,594
      Other current assets                                498     (2,016)       282
      Investments in affiliates                          (641)      (250)      (263)
      Accounts payable and accrued expenses            (7,432)    (1,819)     6,129
      Income taxes                                       (987)    (2,481)       472
      Other                                              (825)      (567)       276
      Net cash provided by operating 
        activities                                     11,846     14,125     18,172
  
  Investing activities:
    Additions to property, plant and 
      equipment                                       (14,667)   (24,698)   (34,862)
    Sale/(Purchase) of short-term 
      investments                                      19,129    (28,623)         -
    Acquisitions, net of cash acquired                 (7,959)    (2,352)         -
      Net cash used by investing 
       activities                                      (3,497)   (55,673)   (34,862)
  
  Financing activities:
    Principal payments on current debt                 (8,845)    (3,601)   (34,250)
    Proceeds from issuance of current debt              8,176        682      9,745
    Principal payments on long-term debt                 (506)    (4,717)      (778)
    Proceeds from issuance of 
      long-term debt                                      256        235      1,655
     Proceeds from stock option plans                   1,078      1,227        419
    Sale of common stock                                    -     53,991     43,827
      Net cash provided by 
      financing activities                                159     47,817     20,618
  
  Effect of exchange rate changes on cash                (509)      (574)       (33) 
  
  Net change in cash and cash equivalents               7,999      5,695      3,895 
  Cash and cash equivalents at 
    beginning of year                                  13,535      7,840      3,945 
  
  Cash and cash equivalents at end of year           $ 21,534   $ 13,535  $  7,840
  
  
  The accompanying notes are an integral part of these financial statements. 

/56

  

   Consolidated Statements of Stockholders' Equity                             Ionics, Incorporated
  


                                             Common Stock        Additional                Cumulative  Total
                                                       Par       Paid-in       Retained    Translation Stockholders' 
  Dollars in thousands                     Shares      Value     Capital       Earnings    Adjustments Equity
                                                                                     
  Balance December 31, 1990                4,172,020   $4,172    $ 26,421      $40,669     $ 4,352     $  75,614 
  Sale of common stock                     1,495,000    1,495      42,332            -           -        43,827 
  Stock options exercised                     41,349       41         189            -           -           230 
  Tax benefit of stock option activity             -        -         189            -           -           189 
  Translation adjustments, net of
       income taxes of $55                         -        -           -            -        (207)         (207) 
  Net income                                       -        -           -        8,278           -         8,278
  
  Balance December 31, 1991                5,708,369    5,708      69,131       48,947       4,145       127,931 
  Sale of common stock                     1,150,000    1,151      52,840            -           -        53,991 
  Stock options exercised                     50,144       50         497            -           -           547 
  Tax benefit of stock option activity             -        -         680            -           -           680 
  Translation adjustments, net of    
    income taxes of $746                           -        -           -            -      (5,629)       (5,629) 
  Net income                                       -        -           -        12,820          -        12,820
  
  Balance December 31, 1992                6,908,513    6,909     123,148       61,767      (1,484)      190,340 
  Stock options exercised                     37,292       37         465            -           -           502 
  Tax benefit of stock option activity             -        -         576            -           -           576 
  Translation adjustments, net of    
  income taxes of $1,165                           -        -           -            -      (5,144)       (5,144) 
  Net income                                       -        -           -       13,807           -        13,807
  Balance December 31, 1993                6,945,805   $6,946    $124,189      $75,574     $(6,628)     $200,081
  
  
  
  
  
  The accompanying notes are an integral part of these financial statements. 

/57

  NOTE 1. SIGNIFICANT ACCOUNTING POLICIES 
  
  Principles of Consolidation 
  
      The consolidated financial statements include the accounts of the
  Company, its wholly and majority-owned subsidiaries and Aqua Cool
  Enterprises, Inc., a controlled affiliate. All significant intercompany
  accounts and transactions have been eliminated.
  
      Investments in affiliated companies, representing non-majority
  ownership interests, are accounted for under the equity method. 
  
  Revenue Recognition 
  
      Product revenues are recorded upon shipment, and service revenues are
  recorded as the services are performed. Interest revenues on consumer
  water equipment loans are recognized over the life of the loans.
  
      Most equipment leases to customers are accounted for as operating
  leases wherein rental revenues are recognized over the life of the lease
  and the cost of the equipment is depreciated over its useful life. Some
  leases are accounted for as sales-type leases wherein the present value of
  the lease revenues and costs are recognized at the time of shipment of the
  product.
  
      Revenues from large contracts are recognized using the percentage
  completion method of accounting in the proportion that costs incurred bear
  to total estimated costs at completion. Losses, if any, are provided for
  in the period in which the loss is determined.
  
      Interest earned on notes receivable, totaling $1,277,000, $1,643,000
  and $1,309,000 in 1993, 1992 and 1991, respectively, is included in
  revenues. 
  
  Cash Equivalents 
  
      Short-term investments with a maturity of 90 days or less from date of
  acquisition a reclassified as cash equivalents. 
  
  Inventories 
  
      Inventories are carried at the lower of cost or market, principally on
  the first-in, first-out basis. The Company had no deferred production
  costs which exceeded the aggregate estimated cost of long-term sales
  contracts. 
/58

  
  Property, Plant and Equipment 
  
      Property, plant and equipment is recorded at cost. When an asset is
  retired or sold, any resulting gain or loss is included in the results of
  operations. Interest capitalized as property, plant and equipment a
  mounted to $177,000, $709,000 and $703,000 in 1993, 1992 and 1991,
  respectively. Depreciation is computed on a straight-line basis over the
  expected lives of the assets, as follows:
  
  Classification                                   Depreciation Lives 
  Buildings and improvements                             10-40 years
  Machinery and equipment, including    
    water supply equipment                                3-25 years 
  Other                                                   3-12 years
  
      The Company's policy is to depreciate desalination plants, other than
  leased equipment, over the shorter of their useful lives or the term of
  the corresponding water supply contracts. 
  
  Goodwill 
  
      Goodwill is included in other assets and represents the unamortized
  difference between acquisition cost and the fair value of net assets
  acquired in the purchase of various entities. Goodwill is amortized on a
  straight-line basis for up to 40 years. 
  
  Foreign Exchange 
  
      Assets and liabilities of foreign affiliates and subsidiaries are
  translated at year-end exchange rates, and the related statements of
  operations are translated at average exchange rates for the year.
  Translation gains and losses are accumulated net of income tax as a
  separate component of stockholdersU equity.
  
      Some transactions of the Company and its subsidiaries are made in
  currencies different from their own. Gains and losses from these
  transactions are included in income as they occur. Net foreign currency
  transaction gains included in income before taxes totaled $157,000,
  $587,000 and $180,000 for 1993, 1992 and 1991, respectively. 
  
  Income Taxes 
  
      Income tax expense is based on pretax financial accounting income.
  Deferred tax assets and liabilities are recognized for the expected tax
  consequences of temporary differences between the tax basis of assets and
  liabilities and their reported amounts. Earnings per Share Earnings per
  share is computed based on the weighted average number of common and
  common equivalent shares outstanding. Common equivalent shares result from
  the assumed exercise of dilutive stock options. Fully diluted earnings per
  share is substantially the same as earnings per share. 
/59

  
  NOTE 2. CONSOLIDATED BALANCE SHEET DETAILS 
  
  Dollars in thousands                         1993         1992
      Raw materials                           $  9,541    $  7,949
      Work in process                            3,016       2,928
      Finished goods                             1,369       1,437
  
      Inventories                             $ 13,926    $ 12,314
  
      Land                                    $  1,261    $  1,279
      Buildings                                 13,829      13,752
      Machinery and equipment                  121,792     110,382
   Other, including furniture, fixtures 
      and vehicles                              18,918      13,348
                                               155,800     138,761
  
   Accumulated depreciation                    (55,355)    (40,960)
  
  Property, plant and equipment, net          $100,445    $ 97,801
  
  Goodwill                                    $ 25,660    $  4,849
  Accumulated amortization                      (1,608)     (1,252) 
  Other                                          5,200           -
  Other assets                                $ 29,252    $  3,597
  
  Obligation for purchase of RCC              $ 10,974    $      -
  
  Customer deposits                              5,668       4,288 
  Accrued commissions                            1,733       1,778 
  Accrued expenses                              13,957       9,994 
  Other current liabilities                   $ 32,332    $ 16,060 
  
  NOTE 3. SUPPLEMENTAL CASH FLOW INFORMATION 
  Dollars in thousands                        1993       1992       1991 
  
  Cash payments for interest and income taxes:
  
      Interest                                $   150   $  783    $3,320
      Taxes                                   $ 4,403   $7,374    $3,119
  
   Liabilities assumed in conjunction with 
   acquisitions and ACE preferred stock purchase:
      Fair value of assets consolidated       $47,825   $2,609
      Net cash paid                            (7,959)    (375)
      Liability associated with purchase of
       Resources Conservation Co. (net
       of cash acquired)                      (10,488)       -
  
  Liabilities assumed                         $29,378   $2,234
/60

  
  NOTE 4. ACCOUNTS RECEIVABLE 
  
  Dollars in thousands                        1993      1992 
  
  Billed receivables                          $36,819   $29,068 
  Unbilled receivables                         21,715    16,208 
  Allowance for doubtful accounts              (1,320)   (1,636) 
  Accounts receivable                         $57,214   $43,640 
  
  Unbilled receivables represent the excess of revenues recognized on
  percentage of completion contracts over amounts billed. These amounts will
  become billable as the Company achieves contractual milestones.
  Substantially all of the unbilled amounts at December 31, 1993 are
  expected to be billed during 1994.
  
      Billed receivables include retainage amounts of $3,054,000 and
  $1,626,000 at December 31, 1993 and 1992, respectively. Substantially all
  retainage amounts are collectible within one year. 
  
  NOTE 5. INVESTMENTS IN AFFILIATED COMPANIES 
  
  The Company's investments in the following foreign affiliates are
  accounted for under the equity method. The principal business activities
  of these foreign affiliates involve the production, sale and distribution
  of bottled and treated water and the sale of equipment and replacement
  parts.
                                              Ownership
  Affiliate                                   Percentage 
  
  Aqua Cool Kuwait - Kuwait                   49% 
  Aqua Cool Saudi Arabia - Saudi Arabia       40%
  Jalal-Ionics, Ltd. - Bahrain                40%
  Watlington Waterworks Limited - Bermuda     23% 
  Yuasa-Ionics Co., Ltd. - Japan              50%
  
      The Company's percentage ownership interest in a foreign affiliate may
  vary from its interest in the earnings of such affiliate.
  
  Activity in investments in affiliated companies: 
  Dollars in thousands                        1993      1992      1991 
  
  Investments at beginning of year            $4,279    $ 4,008   $ 3,720
  Equity in earnings                             775      1,281     1,412
  Distributions received                        (134)    (1,058)   (1,211)
  Additional investment
      made during the year                         -         27        62
  
  Cumulative translation adjustments              69         21        25 
  
  Investments at end of year                  $4,989    $ 4,279   $ 4,008
  
      At December 31, 1993, the Company's equity in the total assets and in
  the total liabilities of its foreign affiliates was $10,480,000 and
  $5,491,000, respectively. The Company's equity in the 1993 total revenues
  of these affiliates was $9,094,000.
/61


  
  Summarized data for foreign affiliates follows: 
  Dollars in thousands                        1993      1992      1991 
  
  Current assets                              $ 9,056   $ 8,622   $ 7,773
  Property and equipment, net                   8,169     7,848     5,262
  Current liabilities                           7,069     7,505     4,479
  Long-term debt                                  424       584       652
  Revenues                                     15,288    14,724    13,387
  Gross profit                                  6,701     6,929     6,312 
  Net income                                    1,364     2,076     1,981
  
  
  
   NOTE 6. CONTINGENT LIABILITIES 
  
      The Company is from time to time involved in litigation in the normal
  course of its business. None of these litigation matters is believed to be
  material to the financial position or business of the Company.
  
      Under the terms of a 1992 Settlement Agreement among the potentially
  responsible parties (PRPs), the Environmental Protection Agency (EPA) and
  the Commonwealth of Massachusetts, the Company paid $381,000 as a
  settlement amount to the Silresim Superfund Site settlement trust fund,
  representing the Company's approximately 1% volumetric contribution of
  wastes to the site. This fund, which contains in excess of $40 million,
  will be used by the EPA to clean up the Silresim Site in Lowell,
  Massachusetts. The amount paid by the Company had been fully reserved at
  December 31, 1991, and the payment had no material adverse impact on the
  Company. Because the pollution problems at the site have been extensively
  studied and because the funds collected from the settling PRPs by the site
  settlement trust fund substantially exceed the EPA's own estimate of
  remediation costs, the Company believes that it is unlikely that it will
  incur any further monetary obligations with respect to this site, other
  than site access costs that will be incurred by the EPA in connection with
  its remediation activities. The Company's share of these site access costs
  is expected to be $30,000 to $40,000 over the next several years. 
  
      The Company was notified in June, 1992 that it is a PRP at another
  Superfund site, Solvent Recovery Service of New England in Southington,
  Connecticut (the "SRS Site"). The EPA has not yet completed its remedial
  investigation or issued a record of decision specifying estimated clean-up
  costs, and therefore it is too early to determine what the Company's
  liability might be with respect to the SRS Site. However, based upon the
  very large number of PRPs identified (over 1,000), the Company's small
  volumetric ranking in comparison to the total volume of wastes (less than
  0.5%) and the identities of the larger PRPs, which include many
  substantial companies, the Company believes that its liability in this
  matter will not have a material effect on the Company or its financial
  position.
/62

  
  NOTE 7. LONG-TERM DEBT AND NOTES PAYABLE 
  
  Dollars in thousands                        1993      1992 
  
  6 3/4% Industrial Revenue Bond 
      due 1994, in equal quarterly 
      installments                            $120      $360 
  9% mortgage note payable to bank due in 
      equal monthly installments                 -       198 
  Other credits                                162       422
                                               282       980 
  Less installments due within one year        173       541 
  
  Long-term debt and notes payable            $109      $439 
  
  The Industrial Revenue Bond is a limited obligation of the Industrial
  Development Financing Authority Board of the Town of Watertown,
  Massachusetts, guaranteed by the Company and collateralized by property,
  plant and equipment with a net book value of approximately $1,965,000 at
  December 31, 1993.
  
      Maturities of long-term debt and notes payable for the five years
  ending December 31, 1994 to 1998 are approximately $173,000, $22,000,
  $19,000, $8,000 and $7,000, respectively.
  
      The Company has domestic credit arrangements with various banks under
  which it can borrow up to an aggregate of approximately $35 million, at
  the prime rate or the London Interbank Offered Rate plus 1/2%, at the
  Company's option. There were no borrowings outstanding under these lines
  of credit at December 31, 1993 or 1992.
  
      The Company utilizes short-term bank loans to finance working capital
  requirements for certain business units. During 1993 and 1992, the
  weighted average amount of such borrowings was approximately $1,429,000
  and $1,290,000, respectively, and the maximum short-term borrowings under
  these arrangements in 1993 and 1992 were approximately $7,395,000 and
  $3,174,000, respectively. The Company's various loan and note agreements
  contain certain financial covenants typical to such agreements relating to
  working capital and to consolidated tangible net worth.
  
  NOTE 8. INCOME TAXES 
  
  Effective January 1, 1993, the Company changed its method of accounting
  for income taxes from the deferred method to the liability method required
  by Financial Accounting Standard No. 109 (FAS 109). As permitted under the
  new rule, prior years' financial statements have not been restated. The
  cumulative effect of adopting this Statement as of January 1, 1993 was
  immaterial to net income.
  
      The Company has elected not to provide tax on certain undistributed
  earnings of its foreign subsidiaries which it considers to be permanently
  reinvested. The cumulative amount of such unprovided taxes was
  approximately $369,000, $30,000 and $1,418,000 as of December 31, 1993,
  1992 and 1991, respectively. Reduced tax payments resulting from
  allocating tax benefits associated with the exercise of stock options
  directly to additional paid-in capital totaled $576,000, $680,000 and
  $189,000 in 1993, 1992 and 1991, respectively.
/63

  
      The following is a summary of U.S. and non-U.S. income before income
  taxes and minority interest, the components of the provisions for income
  taxes and deferred income taxes and a reconciliation of the U.S. statutory
  income tax rate to the effective income tax rate.
  
  Income before income taxes and minority interest: 
  
  Dollars in thousands                        1993      1992      1991 
  
  U.S.                                        $10,902   $ 9,753   $ 5,867
  Non-U.S.                                      8,822     8,431     5,782
  Income before income taxes and 
      minority interest                       $19,724   $18,184   $11,649
  
  
  Income tax provisions (benefits) consist of the following: 
  
  Dollars in thousands                        1993      1992      1991
  
      Federal                                 $2,124    $2,121    $ 2,603
      Foreign                                  1,729     2,290        755
      State                                      475       300        475 
  
  Current provision                            4,328     4,711      3,833
  
      Federal                                    528      (441)    (1,061)
      Foreign                                  1,013       976        625
      State                                       48        27       (135)
  
  Deferred provision (benefit)                 1,589       562       (571) 
  Provision for income taxes                  $5,917    $5,273    $ 3,262
  
  Deferred tax provisions (benefits) consist of the following: 
  
  Dollars in thousands                        1993      1992      1991
  
  U.S. tax on unremitted earnings               
      (net of foreign tax credit )            $  335    $   -     $    -
  Use of installment method                        -        -       (744) 
  Use of different book/tax contract 
      accounting methods                         257      (94)    (1,090)
  Net reversal of deferred profit on   
      sales to foreign subsidiaries               71       44         33 
  Use of accelerated depreciation                651      672        970 
  DISC dividend                                 (197)    (197)      (197) 
  Bad debt reserve activity                       87      (76)       126 
  Other, net                                     385      213        331 
  Deferred tax provision (benefit)            $1,589    $ 562     $ (571) 
/64

  
  The United States statutory corporate tax rate is reconciled to the
  Company's effective tax rate as follows:
  
                                              1993      1992      1991 
  
  U.S. Federal statutory rate                 34.0%     34.0%     34.0% 
  Foreign Sales Corporation                   (1.9)     (2.2)     (4.4) 
  Tax exempt interest income                  (3.5)     (3.7)        -
  Provision on undistributed 
      foreign earnings                           -       7.8         -
  Timing items completely reversed               -      (7.5)        -
  State income taxes,
      net of federal tax benefit               1.8       1.2       1.9 
  Foreign income taxed at different rates     (1.3)       .3      (3.8) 
  Other, net                                    .9       (.9 )      .3 
  Effective tax rate                          30.0%     29.0%     28.0% 
  
  Deferred income taxes reflect the net tax effects of temporary differences
  between the carrying amounts of assets and liabilities for financial
  reporting purposes and the amounts used for income tax purposes. At
  December 31, 1993 the temporary differences are:
  
                                              Deferred     Deferred tax 
  Dollars in thousands                        tax assets   liabilities 
  
  Depreciation                                $     -      $ 2,992 
  Inventory valuation                             257           -
  Unremitted earnings                               -          512 
  Bad debt reserves                               224            - 
  Sales to foreign subsidiaries                 1,150            -
  Insurance reserves                              234            -
  Pensions                                        298            -
  Sale versus lease                             1,186            -
  Foreign withholding taxes on
      undistributed earnings                        -        1,333
  Foreign deferred liabilities                      -        1,524
  Net operating loss carryforwards              6,340            -
  Miscellaneous                                 1,103        1,162
                                               10,792        7,523
  
  Valuation allowance for deferred
      tax assets                               (1,800)           -
  
  Deferred income taxes                       $ 8,992      $ 7,523
  
      At December 31, 1993, the Company had unused tax loss carryforward
  benefits of $6,340,000 (expiring in fiscal years 2004 to 2008). Because
  certain provisions of the tax law may limit the utilization of these
  benefits, the Company has established a $1,800,000 valuation allowance at
  December 31, 1993. The net unused tax loss carryforward benefit of
  $4,540,000 has been included in other assets. 
/65

  
  NOTE 9. STOCKHOLDERS' EQUITY 
  
      The Company maintains two stock option plans. Under its 1979 Stock
  Option Plan (the "1979 Plan"), options may be granted to officers and
  other employees of the Company (either as non-qualified options or until
  February 15, 1989, as incentive stock options) and are exercisable at a
  price of not less than $1.00 per share. Any difference between the option
  price and the fair market value at the date of grant is charged to
  operations over the expected period of benefit to the Company. No
  additional shares of common stock were authorized for issuance as options
  during 1993. At December 31, 1993, 12,754 shares were reserved for
  issuance of additional options under the 1979 Plan.
  
      During 1992, an additional 70,000 shares of common stock were
  authorized for issuance as options under the 1986 Stock Option Plan for
  Non-Employee Directors (the "1986 Plan"). These options may be granted at
  a price not less than fair market value at the date of grant. No
  additional shares of common stock were authorized for issuance as options
  under the 1986 Plan during 1993. As of December 31, 1993, 67,000 shares
  were reserved for issuance of additional options under the 1986 Plan.
  
      The Company has also reserved 45,600 shares for options granted in
  1990 to certain non-employees in exchange for a previously granted option
  to purchase 50% of the shares of Osmomar S.A., a Spanish subsidiary of the
  Company which was merged with Ionics Iberica, S.A. in 1992.

  
      A summary of changes in the total amount of outstanding options for
  the three years ended December 31, 1993 follows:

  
                                               1993           1992           1991 
                                                                    
  Shares under option,
      beginning of year                       530,375        555,780        361,769
  Options granted                             350,250         31,750        245,500
  Options exercised                           (39,839)       (55,480)       (51,489)
  Options cancelled                            (8,000)        (1,675)             -
  Shares under option,
      end of year                             832,786        530,375        555,780
  Shares exercisable                          800,866        493,895        514,740
  
  Price range of 
      options granted                         $39.50-48.75   $ 1.00-60.75   $40.13-46.25
  Price range of 
      options exercised                       $ 1.00-54.00   $11.00-43.00   $ 1.00-24.50
   Price range of 
      options exercisable                     $ 1.00-60.75   $ 1.00-60.75   $ 1.00-46.25
  

      The Company also has a Section 401(k) stock savings plan under which 75,000 shares
  have been registered with the Securities and Exchange Commission for purchase on behalf
  of employees. Shares will normally be acquired for the plan in the open market. However,
  the Board of Directors has reserved an additional 60,000 shares for issuance by the
  Company from authorized but unissued shares if required. Through December 31, 1993, no
  shares had been issued under the plan.

/66

 
     The Company has adopted a Stockholder Rights Plan designed to protect 
stockholders against abusive takeover tactics. Rights were distributed as a 
dividend at the rate of one right for each share of the Company's stock. Each 
right entitles the holder to purchase from the Company one unit, consisting 
initially of one-fifth share of common stock and one note in principal amount 
equal to four-fifths of the current market price of the common stock on the 
date of exercise, at a purchase price of $50 subject to adjustment. In certain 
circumstances, rights cease to be exercisable for a unit and become 
exercisable for $100 worth of common stock (or a combination of cash, property 
or other securities of the Company) for $50.
  
     The rights are not exercisable until: (i) 10 days following a public 
announcement that a person or group has acquired 20 percent or more of the 
Company's common stock; or (ii) 10 business days following the commencement 
of a tender offer that could result in the person or group owning at least 
30 percent of the Company's stock; or (iii) immediately after a declaration 
by the Company's independent directors that a person is an "Adverse Person," 
as defined in the Rights Plan.
  
     Subject to possible extension, the rights may be redeemed by the Company 
at $.01 per right at any time until 10 days after a public announcement that 
20 percent or more of the Company's outstanding common stock has been acquired 
by a person or group. Unless redeemed earlier, the rights, which have no 
voting power, expire on December 31, 1997. 

  NOTE 10. OPERATING LEASES 
  
      The Company leases equipment, primarily triple-membrane trailers and 
bottled water coolers, to customers through operating leases. The original 
cost of this equipment was $37,555,000 and $27,657,000 at December 31, 1993 
and 1992, respectively. The accumulated depreciation for such equipment was 
$9,914,000 and $6,173,000 at December 31, 1993 and 1992, respectively.
  
     At December 31, 1993, future minimum rentals receivable under 
noncancelable operating leases in the years 1994 through 1998 and later were 
approximately $5,582,000, $5,019,000, $4,019,000, $3,329,000, $2,705,000 and 
$7,745,000, respectively. 
  
  NOTE 11. PROFIT SHARING AND PENSION PLANS 
  
     The Company has a contributory profit-sharing plan covering substantially 
all of the employees of its Bridgeville, Pennsylvania operations and certain 
related operations.  Company contributions are made from pre-tax profits and 
may vary from 8% to 15% of participants' compensation and are allocated to 
participantsU accounts in proportion to each participants' respective 
compensation. Company contributions were $381,000, $372,000 and $387,000 in 
1993, 1992 and 1991, respectively.
  
     The Company also has a contributory defined benefit pension plan for its 
Watertown-based employees as well as personnel at Ionics Pure Solutions in 
Arizona, Ionics Ultrapure Water Corporation in California and Resources 
Conservation Company in Washington. The benefits are based on years of service 
and the employee's average compensation.  The Company's funding policy is to 
contribute annually an amount that can be deducted for federal income tax 
purposes.
/67


      The following table sets forth the pension plan's funded status and amounts
  recognized in the Company's balance sheets at December 31, 1993 and 1992:
  
  Dollars in thousands                             1993       1992 
                                                        
  Actuarial present value of benefit obligations:
      Accumulated benefit obligation, 
      including vested benefits of 
      $6,447 and $5,734, respectively              $6,778     $5,957
      Projected benefit obligation for service 
      rendered to date                             $7,736     $6,678 
  
  Plan assets at fair value                         6,615      5,829 
  Projected benefit obligation in excess 
      of plan assets                                1,121        849 
  Unrecognized net loss                              (508)      (287) 
  Unrecognized prior service cost                    (120)      (130) 
  Unrecognized net assets being amortized 
      over approximately 17 years                     520        573 
  Accrued pension cost at December 31              $1,013     $1,005


  Net pension cost included the following components: 

  Dollars in thousands                             1993       1992          1991 
                                                                   
  Service cost                                     $568       $482          $386 
  Interest cost                                     556        512           478 
  Return on plan assets                            (632)      (380)         (886) 
  Net amortization (deferral)                        50       (137)          416 
  Net periodic pension cost                        $542       $477          $394
  

    The discount rates used in determining the projected benefit obligation
 are 7.5% in 1993 and 8% in 1992. The rate of increase in compensation
 levels used is 6%. The expected long-term rate of return on assets was 9%.
 Plan assets consist primarily of money market, equity and fixed income
 securities and are administered by an independent trustee.
  
      The Company does not provide post-retirement health care to its employees or any
  other significant post-retirement benefits  other than those described above. 
  
  NOTE 12. FINANCIAL INSTRUMENTS 
  
  Off-Balance-Sheet Risk 
  
      The Company issues letters of credit as guarantees for various performance and bid
  obligations. Approximately $19.2 million and $5.2 million of these letters were
  outstanding at December 31, 1993 and 1992, respectively. Approximately 11% of the
  letters of credit outstanding at December 31, 1993 are scheduled to expire in 1994. The
  Company periodically enters into foreign exchange contracts to hedge certain operational
  and balance sheet exposures against changes in foreign currency exchange rates. Because
  the impact of movements in currency exchange rates on foreign exchange contracts offsets
  the related impact on the underlying items being hedged, these instruments do not
  subject the Company to risk that would otherwise result from changes in
  currency  exchange rates. The Company had no foreign exchange contracts
  outstanding at December 31, 1993 and 1992.

/68

  Concentrations of Credit Risk 
  
     Financial instruments that potentially subject the Company to significant
concentrations of credit risk consist principally of cash equivalents, 
investments, trade accounts receivable and notes receivable. The credit risk 
of cash equivalents and investments is low as the funds are primarily invested 
in U.S. government securities and with major financial institutions. The 
Company's concentrations of credit risk with respect to trade accounts 
receivable and notes receivable is considered low. The Company's customer base 
is spread across many different industries and geographies and the Company 
obtains guaranteed letters of credit for many of its foreign orders. 
  
  FAIR VALUE OF FINANCIAL INSTRUMENTS 
  
     The carrying amounts of cash equivalents and investments closely 
approximates their fair values as these items have relatively short maturities 
and are highly liquid. Based on market information, the carrying amounts of 
notes receivable and debt approximates their fair values. 

  INVESTMENTS IN SECURITIES 
  
     In May 1993, the Financial Accounting Standards Board issued Financial 
Accounting Standard No. 115, "Accounting for Certain Investments in Debt and 
Equity Securities," which requires the expanded use of fair value accounting 
for certain investments in debt and equity securities. The Statement is 
effective for fiscal years beginning after December 15, 1993. The impact of 
adoption on the Company's financial position is not expected to be material. 
  
  NOTE 13.  CONSOLIDATION AND ACQUISITION 
  
  AQUA COOL ENTERPRISES, INC. 
  
     Prior to May 26, 1993, Aqua Cool Enterprises, Inc. ("ACE") was an 
independently owned distributor of the Company's Aqua Cool bottled water 
products. The Company sold bottled water and related supplies to ACE; leased 
coolers and vehicles to ACE; and provided management services and operational 
support to ACE. In addition to equipment lease financing it received from the 
Company, ACE had received $12.5 million in debt and preferred equity financing 
from Westinghouse Credit Corporation ("Westinghouse") over a three- year 
period beginning in 1989.
  
     Effective May 26, 1993, the Company loaned $8.25 million to ACE with 
which ACE subsequently redeemed the outstanding senior note and preferred 
stock of ACE held by Westinghouse. On June 10, 1993, the Company exchanged 
its $8.25 million loan to ACE for ACE preferred stock. The Company holds an 
option to acquire the outstanding common stock of ACE for a nominal amount.
  
     As a result of these transactions, the Company has consolidated the 
operating results of ACE as if ACE were a wholly owned subsidiary. ACE's 
results of operations are included in the Company's consolidated financial 
statements from May 26, 1993. The combination has been accounted for under 
the purchase method with goodwill of $12.2 million, net of federal income 
tax benefits of $4.5 million, being amortized on a straight-line basis over 
40 years.
/69


    For purposes of presenting the following unaudited pro forma
 consolidated results all transactions between the Company and ACE have
 been eliminated as if the consolidation had occurred on January 1, 1992.
    The pro forma results also reflect adjustments that are attributable to
 the consolidation such as interest expense, goodwill amortization,
 operational efficiencies, asset revaluations and related tax effects.
    
  
  Twelve Months Ended December 31 (unaudited)
                                                   1993       1992 
                                                       
  Net revenues                                     $174,400   $155,569 
  Income before extraordinary items                $ 12,702   $ 10,401
  Net income                                       $ 12,702   $ 10,401
  Earnings per share                               $ 1.80     $ 1.50
  
    RESOURCES CONSERVATION COMPANY 
 
  Effective December 1, 1993, the Company acquired a substantial portion of the assets and
  liabilities of Resources Conservation Company (RCC) for approximately $10.9 million. RCC
  designs, engineers and installs wastewater treatment systems.
  
      The acquisition was accounted for under the purchase method with the results of RCC
  included from December 1, 1993. Goodwill of $8.3 million is being amortized on a
  straight-line basis over 40 years. Pro forma results of operations have not been
  presented as the effect of this acquisition on the financial statements was immaterial.
  Fiscal 1993 RCC revenues for the period prior to December 1, 1993 were approximately
  $25.3 million.
  
      Payment of the RCC purchase price of $10.9 million plus related interest expense of
  approximately $100,000 occurred on January 27, 1994. The obligation for payment plus
  related accrued interest was included in other current liabilities at December 31, 1993. 
  
  NOTE 14. SEGMENT INFORMATION 
  
  Business Segments The Company conducts its business in three business segments:
  
      Membranes and Related Equipment - electrodialysis reversal systems; reverse osmosis
  systems; microfiltration systems; conventional water and wastewater treatment equipment;
  other separations technology products; zero liquid discharge systems; instruments for
  monitoring and on-line detection of pollution levels; and fabricated products.
  
      Water and Chemical Supply - water and chemicals produced by the Company's membrane-
  based equipment, including desalted water for municipal and industrial use; ultrapure
  water for electronics and other industries; and bleach and related chemicals.
  
      Consumer Water Products - bottled water; over and under-the-sink point of use
  devices; carbon filtering media; and point-of-entry systems for treating the entire home
  water supply.

/70


      A summary of the Company's operations by business segment follows on the next page:
  


                                          Membranes    Water and    Consumer   Corporate
                                         and Related    Chemical      Water        and  
  Dollars in thousands                    Equipment      Supply     Products      Other         Total
                                                                              
  1993 
  Revenue - unaffiliated customers           $92,352     $51,513     $31,408       $  -      $175,273
  Intersegment transfers                       1,165         574           9     (1,748)           - 
  Income from operations                       4,850       8,629       4,679       (998)       17,160
  Equity income                                (195)         155         815          -           775
  Earnings before interest and taxes (EBIT)    4,655       8,784       5,494       (998)       17,935
  EBIT % of total EBIT                           26%         49%         31%        (6%)         100%
  Identifiable assets                         78,341      88,094      54,533      23,605      244,573
  Investments in affiliated companies            338       1,108       3,543          -         4,989
  Depreciation and amortization                2,159      10,431       2,662         211       15,463
  Capital expenditures                         2,605       9,470       2,092         500       14,667
  
  1992 
  Revenue - unaffiliated customers           $81,019     $46,698     $27,523       $  -      $155,240
  Intersegment transfers                       1,939         597           3     (2,539)          -  
  Income from operations                       7,540       7,585       1,013     (1,322)       14,816
  Equity income                                (185)         158       1,308          -         1,281
  Earnings before interest and taxes (EBIT)    7,355       7,743       2,321     (1,322)       16,097
  EBIT % of total EBIT                           46%         48%         14%        (8%)         100%
  Identifiable assets                         55,833      92,906      35,377      36,195      220,311
  Investments in affiliated companies            463         981       2,835          -         4,279
  Depreciation and amortization                1,957       8,212       2,113         306       12,588
  Capital expenditures                         1,548      19,467       3,069         614       24,698
  
  1991 
  Revenue - unaffiliated customers           $76,267     $31,491     $30,362       $  -      $138,120
  Intersegment transfers                       1,231         780          -      (2,011)           - 
  Income from operations                       4,653       5,022       1,699     (1,192)       10,182
  Equity income                                 (19)         116       1,315          -         1,412
  Earnings before interest and taxes (EBIT)    4,634       5,138       3,014     (1,192)       11,594
  EBIT % of total EBIT                           40%         44%         26%       (10%)         100%
  Identifiable assets                         53,628      86,891      32,572         880      173,971
  Investments in affiliated companies            628         829       2,551          -         4,008
  Depreciation and amortization                1,968       3,758       2,483         321        8,530
  Capital expenditures                         1,802      30,797       2,006         257       34,862
  



/71



  Geographic Segments 
  
  Sales are reflected in the segment from which the sales are made. Transfers between
  areas are generally made at cost plus a markup which approximates prices charged to
  unaffiliated customers. Certain corporate expenses are included with the  elimination of
  intersegment profit in the "Corporate and Eliminations" segment. Identifiable corporate
  assets, which are net of eliminations, consist primarily of cash and short-term
  investments. Information about the Company's operations by geographic  segment follows:
  

                                                                                        Corporate
                                                       United                      Other         and 
  Dollars in thousands                                 States        Europe        International Eliminations  Total 
                                                                                                 
  1993 
  Revenue - unaffiliated customers                     $123,599      $42,571       $ 9,103       $      -      $175,273
  Intersegment transfers                                  9,375          420         2,824        (12,619)            - 
  Income from operations                                 10,968        5,417           985           (210)       17,160
  Identifiable assets                                   171,483       42,041        11,771         19,278       244,573 
  1992 Revenue - unaffiliated customers                $102,498      $41,992       $10,750       $      -      $155,240
  Intersegment transfers                                  7,033          223         1,731         (8,987)            - 
  Income from operations                                  8,852        6,546           907         (1,489)       14,816
  Identifiable assets                                   137,562       41,580        10,387         30,782       220,311 
  1991 
  Revenue Q unaffiliated customers                     $ 85,427      $40,754       $11,939       $      -      $138,120 
  Intersegment transfers                                  8,581        1,342         2,049        (11,972)            - 
  Income from operations                                  5,234        4,910           947           (909)       10,182
  Identifiable assets                                   113,237       55,383        10,066         (4,715)      173,971 
  
  Included in the United States segment are export  sales of approximately 22%, 27% and 26% for 1993, 1992 and 1991,
  respectively. Including these U.S. export sales, the percent ages of total revenues attributable to activities outside
  the U.S. were 45%, 52% and 54% in 1993, 1992 and 1991, respectively.
  


/72


  Report of Independent Accountants
  
  To the Board of Directors and Stockholders of Ionics, Incorporated: 
  
  We have audited the consolidated balance sheets of Ionics, Incorporated at 
December 31, 1993 and 1992 and the related consolidated statements of 
operations, cash flows and stockholders' equity for each of the three years 
in the period ended December 31, 1993. 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 generally accepted auditing 
standards. 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 consolidated financial position of Ionics, 
Incorporated as of December 31, 1993 and 1992, and the consolidated results 
of its operations and its cash flows for each of the three years in the 
period ended December 31, 1993, in conformity with generally accepted 
accounting principles.
  
  
  Boston, Massachusetts February 22, 1994
  
/73


  
  Selected Financial Data                              Ionics, Incorporated
  
  
  
  Statement of Operations Data 
  Dollars in thousands, except 
  per share amounts                1993      %         1992      %         1991      %         1990      %         1989         % 
                                                                                               
  Revenues                         $175,273  100.0     $155,240  100.0     $138,120  100.0     $128,408  100.0     $108,915  100.0
  Income before income taxes         19,724   11.3       18,184   11.7       11,649    8.4        6,442    5.0        5,310    4.9
  Net income                         13,807    7.9       12,820    8.3        8,278    6.0        4,727    3.7        3,590    3.3
  EarnEarnings per share               1.96                1.85                1.45                1.10                 .85       
  
  

 
  Balance Sheet Data 
  Dollars in thousands             1993      1992      1991      1990      1989 
                                                                  
  Current assets                   $109,957  $108,757  $ 72,334  $ 66,572  $ 67,018 
  Current liabilities                46,082    30,499    36,528    51,716    44,833 
  Working capital                    63,875    78,258    35,806    14,856    22,185 
  Total assets                      249,562   224,590   177,979   143,759   134,874 
  Long-term debt and notes payable      109       439     5,579     8,027    14,419 
  Stockholders' equity              200,081   190,340   127,931    75,614    68,102
  



  
  Selected Quarterly Financial Data (unaudited) 
  Dollars in thousands,                                          Earnings                                                   Earnings
  except per                                 Gross     Net       per                                     Gross     Net      per
  share amounts                    Revenues  Profit    Income    Share                         Revenues  Profit    Income   Share 
  1993                                                                     1992 
                                                                                                 
  First Quarter                    $ 41,158  $13,911   $ 3,364     .48     First Quarter       $ 36,248  $13,182   $ 2,607  $  .40
  Second Quarter                     45,618   15,080     3,520     .50     Second Quarter        40,063   14,183     3,183     .45 
  Third Quarter                      42,791   14,314     3,516     .50     Third Quarter         37,111   13,620     3,372     .48
  Fourth Quarter                     45,706   14,965     3,407     .48     Fourth Quarter        41,818   14,324     3,658     .52
                                   $175,273  $58,270   $13,807   $1.96                         $155,240  $55,309   $12,820   $1.85
  

 
  Common Stock Price Range         High      Low                 High      Low 
  1993                                                                               1992 
                                                                      
  First Quarter                    $67 7/8   $53 1/2   First Quarter       $67 1/2   $42 1/4 
  Second Quarter                   $56 3/8   $39       Second Quarter      $59 7/8   $51 
  Third Quarter                    $50       $38 1/2   Third Quarter       $57 1/2   $50 
  Fourth Quarter                   $52 3/8   $46 3/4   Fourth Quarter      $68 1/2   $51 3/4


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         Board of Directors
         
         ARTHUR L. GOLDSTEIN u
         Chairman of the Board,
         President and Chief 
         Executive Officer
         Ionics, Incorporated
         
         WILLIAM L. BROWN s n 
         Retired Chairman of the 
         Board, The First National 
         Bank of Boston
         
         ARNAUD DE VITRY D'AVAUCOURT s n 
         Engineering Consultant 
         and Director of Various 
         Organizations
         
         LAWRENCE E. FOURAKER u s n 
         Trustee and Director of 
         Various Organizations
         
         SAMUEL A. GOLDBLITH u s n  
         Professor Emeritus
         Massachusetts Institute
         of Technology, and
         Consultant
         
         K. KACHADURIAN
         Senior Vice President
         Ionics, Incorporated
         
         WILLIAM E. KATZ    
         Executive Vice President 
         Ionics, Incorporated
         
         ROBERT B. LUICK   
         Of Counsel, Sullivan and 
         Worcester, Attorneys
         
         JOHN J. SHIELDS s n 
         President and Chief
         Executive Officer
         King's Point
         Holdings Incorporated
         
         MARK S. WRIGHTON 
         Provost and Professor of Chemistry, 
         Massachusetts Institute of Technology
         
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         ALLEN S. WYETT s n
         President, Wyett 
         Consulting Group, Inc.
         
         
         
         u    Member of Executive 
              Committee
         s    Member of Audit
              Committee
         n    Member of Compensation
              Committee
         
         
         
         
         











































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         Corporate Officers
         
         ARTHUR L. GOLDSTEIN
         Chairman of the Board,
         President and Chief
         Executive Officer
         
         WILLIAM E. KATZ
         Executive Vice President
         
         K. KACHADURIAN      
         Senior Vice President
         
         ROBERT J. HALLIDAY    
         Vice President     
         Finance and Accounting 
         and Chief Financial 
         Officer
         
         STEPHEN KORN          
         Vice President, General 
         Counsel and Clerk
         
         THEODORE G. PAPASTAVROS 
         Vice President    
         Strategic Planning      
         and Treasurer
         
         
         
         
         
         
         
         
         
























/77
         
         
         
         Principal Offices, 
         Affiliates &
         Subsidiaries
         
         Ionics, Incorporated 
         Bridgeville, Pennsylvania
         
         General Ionics      
         Cuyahoga Falls, Ohio
         
         Ionics Pure Solutions 
         Phoenix, Arizona
         
         Elite Chemicals N.E.,
         Springfield, Massachusetts
         
         Ionics Ultrapure Water Corp. 
         Campbell, California
         
         Resources Conservation Co.
         Bellevue, Washington
         
         Resources Conservation Co. International
         Bellevue, Washington
         
         Ionics Italba, S.p.A. 
         Milan, Italy
         
         Ionics Iberica, S.A. 
         Grand Canary, Spain
         
         Ionics Nederland, B.V.
         Maastricht, the Netherlands
         
         Ionics 
         (UK) Ltd.    
         London, England
         
         Global Water Services,  S.A.
         Panama City, Panama
         
         Ionics, Incorporated    
         Hong Kong
         
         Ionics (Bermuda) Ltd. 
         Hamilton, Bermuda
         
         Elite Chemicals Pty. Ltd. 
         Brisbane, Qld. Australia
         
         












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         Eau et Industrie       
         Paris, France
         
         Watlington Waterworks Ltd. 
         Devonshire, Bermuda
         
         Jalal-Ionics, Ltd.   
         Manama, Bahrain
         
         Aqua Cool Saudi Arabia 
         Dammam, Saudi Arabia
         
         Aqua Cool Kuwait    
         Kuwait City, Kuwait
         
         Aqua Cool Enterprises, Inc.
         Watertown, Massachusetts
         
         Yuasa-Ionics Co., Ltd. 
         Tokyo, 
         Japan
         Corporate Headquarters
         
         Ionics, Incorporated 
         Watertown, Massachusetts
         
         
         Investor Information
         
         The Annual Meeting of Ionics'
         shareholders will be held 
         Thursday, May 5, 1994 at 
         2:00 P.M. at Bank of Boston 
         100 Federal Street, 
         Boston, Massachusetts
         
         
         Ionics' common stock is traded 
         on the New York Stock Exchange under 
         the symbol ION.  As of March 18, 1994 
         there were approximately 
         1,800 shareholders of record.  No cash 
         dividends were paid in either 1993 or 
         1992 pursuant to Ionics' current policy to
         retain earnings for use in its business.
         
         For information or assistance 
         regarding individual stock 
         records, transactions or 
         certificates, please call the 
         Transfer Agent's Telephone 
         Response Center: (617)575-2900 between 8 A.M. and 7 P.M.
         

















/79

         
         
         A copy of Ionics' Annual 
         Report on Form 10-K, which
         is filed with the Securities and 
         Exchange Commission, will be 
         sent to any shareholder upon 
         request directed to Investor 
         Relations, Ionics, Incorporated, 
         P.O. Box 9131,  Watertown, Massachusetts  
         02272-9131, 
         or by calling (617)926-2510 
         ext. 874.
         
         
         TRANSFER AGENT 
         & REGISTRAR
         The First National Bank of 
         Boston, Boston, Massachusetts
         
         
         AUDITORS
         Coopers & Lybrand        
         Boston, Massachusetts
         





































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