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                                                                    EXHIBIT 3.15

                            MEMORANDUM OF ASSICIATION

               OF WITHEY'S WATER SOFTENING & PURIFICATION LIMITED


1.    The name of the Company is Withey's Water Softening & Purification
      Limited.

2.    There are no restrictions on the objects and powers of the Company and the
      Company shall expressly have the following powers:

      (a)   To sell or dispose of its undertaking, or a substantial part
            thereof;

      (b)   To distribute any of its property in specie among its members; and

      (c)   To amalgamate with any company or other body of persons.

3.    The liability of the members is limited.

4.    The authorized capital of the Company is:

      One Thousand (1,000) Class "A" Non-Participating Common voting shares with
      a par value of One ($1.00) Dollar each;

      One Hundred Thousand (100,000) Class :B: Common Non-Voting shares with
      a part value of One ($1.00) Dollar each;

      One Hundred Thousand (100,000) Class "D: Common Non-Voting shares with
      a par value of One ($0.01) Cent each;

      One Hundred Thousand (100,000) Class "E" Preference shares with a par
      value of One ($0.01) Cent each;

      One Hundred Thousand (100,000) Class "F" Preference shares with a par
      value of One ($0.01) Cent each;
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      One Hundred Thousand (100,00) Class "G" Preference shares with a par value
      of One Hundred ($100) Dollars each;

      One Hundred thousand (100,000) Class "H" Preference shares with a par
      value of One ($0.01) Cent each;

      One Hundred Thousand (100,000) Class "I" Preference shares with a par
      value of One ($0.01) Cent each; and

      One Hundred Thousand (100,000) Class "J" preference shares with a par
      value of one ($0.01) Cent each.

      The Class A-J shares having attached thereto the special rights and
      restrictions set out ion the attached Appendix.

With power to divide the shares in the capital for the time being into several
classes and to attach thereto respectively any preferred, deferred or qualified
rights, privileges or conditions, including restrictions on voting rights and
including redemption and purchase of such shares, subject, however, to the
provisions of the Companies Act of Nova Scotia.
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                                  APPENDIX "A"

                                SHARE CONDITIONS

1.    The name of the Company is "WITHEY'S WATER SOFTENING & PURIFICATION
      LIMITED".

2.    The authorized capital of the Company consists of:

      2.1   One Thousand (1,000) Class "A" Non-Participating Common voting
            shares with a par value of One ($1.00) Dollar each;

      2.2   One Hundred Thousand  (100,000) Class "B" Common Non-Voting shares
            without par value;

      2.3   Ten Thousand (10,000) Class "C" Common Non-Voting shares with a par
            value of One ($1.00) Dollar each;

      2.4   One Hundred Thousand (100,000) Class "D" Common Non-Voting shares
            with a par value of One ($0.01) Cent each;

      2.5   One Hundred Thousand (100,000) Class "E" Preference shares with a
            par value of One ($0.01) Cent each;

      2.6   One Hundred Thousand (100,000) Class "F" Preference shares with a
            par value of One ($0.01) Cent each;

      2.7   One Hundred Thousand (100,000) Class "G" Preference shares with a
            par value of One Hundred ($100) Dollars each;

      2.8   One Hundred Thousand (100,000) Class "H" Preference shares with a
            par value of One ($0.01) Cent each;

      2.9   One Hundred Thousand (100,000) Class "I" Preference shares with a
            par value of One ($0.01) Cent each; and

      2.10  One Hundred Thousand (100,000) Class "J" Preference shares with a
            par value of one ($0.01) Cent each.
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3. The Class A-J shares having the conditions attached hereto as Appendix B.
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                                  APPENDIX "B"

                                     PART 26

                      26 - SPECIAL RIGHTS AND RESTRICTIONS

26.1  The Class "A" Non-Participating Common Voting shares shall have attached
      thereto the following special rights and restrictions:

      26.1.1   The holders of the Class "A" Non-Participating Common Voting
               shares must be sent notice of and may attend meetings of the
               shareholders of the Company, are entitled to vote at any such
               meetings, and are entitled to one vote for each Class "A"
               Non-Participating Common Voting share held.

      26.1.2   In the event of any voluntary or involuntary liquidation,
               dissolution, or winding up of the Company, the holders of the
               Class "A" Non-Participating Common Shares shall be entitled to
               receive, out of the assets of the Company (whether from capital
               or surplus or both), the sum of ONE ($1.00) DOLLAR per share (or
               the amount paid up thereon), but the holders of Class "A"
               Non-Participating common shares shall not be entitled to share
               any further in the distribution of the property or assets of the
               Company.

      26.1.3   The directors shall not declare dividends on these Class "A"
               Non-Participating Common Voting shares and the holders are not
               entitled to any.

26.2  The Class "B" Common Not-Voting shares shall have attached thereto the
      following rights and restrictions:

      26.2.1   The holders of the Class "B" Common Non-Voting shares are not
               entitled to notice of or to vote at any meetings for the election
               of directors or at any meeting of the shareholders except as may
               be permitted by the laws of British Columbia.

      26.2.2   The directors may declare dividends on these Class "B" Common
               Non-Voting shares without declaring dividends on shares of any
               other class, and may declare dividends on shares of any other
               class without declaring dividends on these Class "B" Common
               Non-Voting shares.
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26.3  The Class "C" Common Non-Voting shares shall have attached thereto the
      following special rights and restrictions:

      26.3.1   The holders of Class "C" Common Non-Voting shares are not
               entitled to notice of or to vote at any meetings for the election
               of directors or at any meeting of the shareholders except as may
               be provided by the laws of the Province of British Columbia.

      26.3.2   The directors may declare dividends on these Class "C" Common
               Non-Voting shares without declaring dividends on shares of any
               other class, and may declare dividends on shares of any other
               class without declaring dividends on these Class "C" Common
               Non-Voting shares.

26.4  The Class "D" Common Non-voting shares shall have attached thereto the
      following special rights and restrictions:

      26.4.1   The holders of Class "D" Common Non-voting shares are not
               entitled to notice of or to vote at any meetings for the election
               of directors or at any meeting of the shareholders except as may
               be provided by the laws of the Province of British Columbia.

      26.4.2   The directors may declare dividends on these Class "D" Common
               Non-Voting shares without declaring dividends on shares of any
               other class, and may declare dividends on shares of any other
               class without declaring dividends on these Class "D" Common
               Non-Voting shares.

26.5  The Class "E" Preference shares shall have attached thereto the following
      special rights and restrictions:

      26.5.1   The holders of Class "E" Preference shares are not entitled to
               notice of or to vote at any meetings for the election of
               directors or at any meeting of the shareholders except as may be
               provided by the laws of the Province of British Columbia.

      26.5.2   The holders of the Class "E" Preference shares may, in each year,
               at the discretion of the directors, be paid, out of any profits
               or surplus available for dividends, on-cumulative dividends at
               such interest rate as the directors decide at the time of issue
               of the Class "E" Preference shares.

      26.5.3   The Company may, upon giving notice as provided below, redeem all
               or any of the Class "E" Preference shares on payment of the
               redemption/retraction amount set out below for each share to be
               redeemed (herein called the "Redemption Amount"). Not less than
               thirty (30) days' notice in writing of 
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               such redemption shall be given by mailing such notice to the
               registered holders of the shares to be redeemed, specifying the
               date and place of redemption; and if an amount sufficient to
               redeem the shares is deposited with any trust company or
               chartered bank of Canada, as specified in the notice, on or
               before the date fixed for redemption, dividends on the Class "E"
               Preference shares to be redeemed and the rights of the holders
               thereof shall cease after the date so fixed for redemption, who
               shall thereafter have no rights against the Company in respect
               thereof except, upon the surrender of certificates for such
               shares, to receive payment therefor out of the moneys so
               deposited.

      26.5.4   Subject to the provisions of the Company Act, the Company shall,
               upon receiving notice as hereinafter provided from a holder of
               Class "E" preference shares, redeem the number of the Class "E"
               Preference shares registered in the name of the shareholder which
               are specified in the notice by paying to such shareholder for
               each Class "E" preference share to be redeemed the Redemption
               Amount set out below. Not less than twenty-one (21) days notice
               in writing of such redemption shall be given to the Company by
               the shareholders seeking such redemption; such notice to be
               delivered by mail to the registered office of the Company and to
               specify the number of Class "E" Preference shares to be redeemed
               and to attach the necessary number of shares certificates for
               cancellation. The Company shall issue new certificates for any
               shares which are not redeemed but the certificates for which have
               been surrendered. The Company may waive any notice so required to
               be given, and such waiver, whether given before or after or after
               the redemption, shall cure any default in giving such notice.

      26.5.5   When issuing any Class "E" Preference Share the directors shall
               determine the amount payable by the Company to the holder for the
               redemption of such share (the "Redemption Amount"). If any Class
               "E" Preference Shares are issued as payment, in whole or in part,
               for assets transferred to the Company, including shares of the
               Company, the Redemption Amount of such Shares shall be the fair
               market value of the assets or the balance of the fair market
               value thereof, as the case may be, and the Redemption Amount of
               each such share shall be the quotient of such fair market value,
               or balance thereof, divided by the number of Class "E" Preference
               Shares issued as consideration for such assets or shares. If the
               Department of National Revenue, or other authority having
               jurisdiction, shall determine that the Redemption Amount is not
               the fair market value of the assets or shares or of the balance
               of the price for such assets or shares, as the case may be, the
               Redemption Amount for such shares as recorded in the proceedings
               of the directors shall be increased or decreased so that it shall
               be the same as the fair market value of the said assets or shares
               or of the balance of the price for such assets or shares, as the
               case may be, subject always to a final determination of the fair
               market value by a court of competent jurisdiction upon any appeal
               of such determination. If any or all of those shares had been
               redeemed already, then the shareholder who redeemed them 
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               shall pay to or receive from the Company an amount per share
               equaling the decrease or increase in the share price as
               determined above.

      25.5.6   The directors may declare dividends on these Class "E" Preference
               shares without declaring dividends on shares of any other class,
               and may declare dividends on shares of any other class without
               declaring dividends on these Class "E" Preference shares.

26.6  The Class "F" Preference shares shall have attached thereto the following
      special rights and restrictions:

      26.6.1   The holders of Class "F" preference shares are not entitled to
               notice of or to vote at any meetings for the election of
               directors or at any meeting of the shareholders except as may be
               provided by the laws of the Province of British Columbia.

      26.6.2   The holders of the Class "F" Preference shares may, in each year,
               at the discretion of the directors, be paid, out of any profits
               or surplus available for dividends, non-cumulative dividends at
               such interest rate as the directors decide at the time of issue
               of the Class "F" Preference shares.

      26.6.3   The Company may, upon giving notice as provided below, redeem all
               or any of the Class "F" preference shares on payment of the
               redemption/retraction amount set out below for each share to be
               redeemed (herein called the "Redemption Amount"). Not less than
               thirty (30) days' notice in writing of such redemption all be
               given by mailing such notice to the registered holders of the
               shares to be redeemed, specifying the date and place of
               redemption; and if an amount sufficient to redeem the shares is
               deposited with any trust company or chartered bank of Canada, as
               specified in the notice, on or before the date fixed for
               redemption, dividends on the Class "F" Preference shares to be
               redeemed and the rights of the holders thereof shall cease after
               the date so fixed for redemption, who shall thereafter have no
               rights against the Company in respect thereof except, upon the
               surrender of certificates for such shares, to receive payment
               therefor out of the moneys so deposited.

      26.6.4   Subject to the provisions of the Company Act, the Company shall,
               upon receiving notice as hereinafter provided from a holder of
               Class "F" Preference shares, redeem the number of the Class "F"
               Preference shares registered in the name of the shareholder which
               are specified in the notice by paying to such shareholder for
               each Class "F" Preference share to be redeemed the Redemption
               Amount set out below. Not less than twenty-one (21) days notice
               in writing of such redemption shall be given to the Company by
               the shareholder seeking such redemption; such notice to be
               delivered by mail to the registered office of the Company and to
               specify the number of Class "F" Preference 
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               shares to be redeemed and to attach the necessary number of Class
               "F" preference shares to be redeemed and to attach the necessary
               number of share certificates for cancellation. The Company shall
               issue new certificates for any shares which are not redeemed but
               the certificates for which have been surrendered. The Company may
               waive any notice so required to be given, and such waiver,
               whether given before or after the redemption, shall cure any
               default in giving such notice.

      26.6.5   When issuing any Class "F" Preference Share the directors shall
               determine the amount payable by the Company to the holder for the
               redemption of such share (the "Redemption Amount"). If any Class
               "F" Preference Shares are issued as payment, in whole or in part,
               for assets transferred to the Company, including shares of the
               Company, the Redemption Amount of such Shares shall be the fair
               market value of the assets or the balance of the fair market
               value thereof, as the case may be, and the Redemption Amount of
               each such share shall be the quotient of such fair market value,
               or balance thereof, divided by the number of Class "F" Preference
               Shares issued as consideration for such assets or shares. If the
               Department of National Revenue, or other authority having
               jurisdiction, shall determine that the Redemption Amount is not
               the fair market value of the assets or shares or of the balance
               of the price for such assets or shares, as the case may be, the
               Redemption Amount for such shares as recorded in the proceedings
               of the directors shall be increased or decreased so that it shall
               be the same as the fair market value of the said assets or shares
               or of the balance of the price for such assets or shares, as the
               case may be, subject always to a final determination of the fair
               market value by a court of competent jurisdiction upon any appeal
               of such determination. If any or all of those shares had been
               redeemed already, then the shareholder who redeemed them shall
               pay to or receive from the Company an amount per share equaling
               the decrease or increase in the share price as determined above.

      26.6.6   The directors may declare dividends on these Class "F" Preference
               shares without declaring dividends on shares of any other class,
               and may declare dividends on shares of any other class without
               declaring dividends on these Class "F" Preference Shares.

26.7  The Class "G" Preference shares shall have attached thereto the following
      special rights and restrictions:

      26.7.1   The holders of Class "G" Preference shares are not entitled to
               notice of or to vote at any meetings for the election of
               directors or at any meeting of the shareholders except as may be
               provided by the laws of the Province of British Columbia.
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      26.7.2   The holders of the Class "G" Preference shares may, in each year,
               at the discretion of the directors, be paid, out of any profits
               or surplus available for dividends, non-cumulative dividends at
               such interest rate as the directors decide at the time of issue
               of the Class "G" Preference shares.

      26.7.3   The Company may, upon giving notice as provided below, redeem all
               or any of the Class "G" Preference shares on payment of ONE
               HUNDRED ($100.00) DOLLARS for each share to be redeemed
               (hereinafter called the "Redemption Amount"). Not less than
               thirty (30) days' notice in writing of such redemption shall be
               given by mailing such notice to the registered holders of the
               shares to be redeemed, specifying the date and place of
               redemption; and if an amount sufficient to redeem the shares is
               deposited with any trust company or chartered bank of Canada, as
               specified in the notice, on or before the date fixed for
               redemption, dividends on the Class "G" Preference shares to be
               redeemed and the rights of the holders thereof shall cease after
               the date so fixed for redemption, and the holders thereof shall
               then have no rights against the Company in respect thereof
               except, upon the surrender of certificates for such shares, to
               receive payment therefor out of the moneys so deposited.

      26.7.4   Subject to the provisions of the Company Act, the Company shall,
               upon receiving notice as hereinafter provided from a holder of
               Class "G" Preference shares, redeem the number of the Class "G"
               Preference shares registered in the name of the shareholder which
               are specified in the notice by paying to such shareholder for
               each Class "G" Preference share to be redeemed the Redemption
               Amount. Not less than twenty-one (21) days notice in writing of
               such redemption shall be given to the Company by the shareholder
               seeking such redemption; such notice to be delivered by mail to
               the registered office of the Company and to specify the number of
               Class "G" Preference shares to be redeemed and to attach the
               necessary number of share certificates for cancellation. The
               Company shall issue new certificates for any shares which are not
               redeemed but the certificates for which have been surrendered.
               The Company may waive any notice so required to be given and such
               waiver, whether given before or after the redemption shall cure
               any default in giving such notice.

26.8  The Class "H" Preference shares shall have attached thereto the following
      special rights and restrictions:

      26.8.1   The holders of Class "H" Preference shares are not entitled to
               notice of or to vote at any meetings for the election of
               directors or at any meeting of the shareholders except as may be
               provided by the laws of the Province of British Columbia.
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      26.8.2   The holders of the Class "H" Preference shares may, in each year,
               at the discretion of the directors, be paid, out of any profits
               or surplus available for dividends, non-cumulative dividends at
               such interest rate as the directors decide at the time of issue
               of the Class "H" Preference shares.

      26.8.3   The Company may, upon giving notice as provided below, redeem all
               or any of the Class "H" Preference shares on payment of ONE
               HUNDRED ($100.00) DOLLARS for each share to be redeemed
               (hereinafter called the "Redemption Amount"). Not less than
               thirty (30) days' notice in writing of such redemption shall be
               given by mailing such notice to the registered holders of the
               shares to be redeemed, specifying the date and place of
               redemption; and if an amount sufficient to redeem the shares is
               deposited with any trust company or chartered bank of Canada, as
               specified in the notice, on or before the date fixed for
               redemption, dividends on the Class "H" Preference shares to be
               redeemed and the rights of the holders thereof shall cease after
               the date so fixed for redemption, and the holders thereof shall
               then have no rights against the Company in respect thereof
               except, upon the surrender of certificates for such shares, to
               receive payment therefor out of the moneys so deposited.

      26.8.4   Subject to the provisions of the Company Act, the Company shall,
               upon receiving notice as hereinafter provided form a holder of
               Class "H" Preference shares, redeem the number of the Class "H"
               Preference shares registered in the name of the shareholder which
               are specified in the notice by paying to such shareholder for
               each Class "H" Preference share to be redeemed the Redemption
               Amount. Not less than twenty-one (21) days notice in writing of
               such redemption shall be given to the Company by the shareholder
               seeking such redemption; such notice to be delivered by mail to
               the registered office of the Company and to specify the number of
               class "H" Preference shares to be redeemed and to attach the
               necessary number of share certificates for cancellation. The
               Company shall issue new certificates for any shares which are not
               redeemed but the certificates for which have been surrendered.
               The Company may waive any notice so required to be given and such
               waiver, whether given before or after the redemption shall cure
               any default in giving such notice.

      26.8.5   The directors may declare dividends on these Class "H" Preference
               shares without declaring dividends on shares of any other class,
               and may declare dividends on shares of any other class without
               declaring dividends on these Class "H" Preference Shares.

26.9  The Class "F" Preference shares shall have attached thereto the following
      special rights and restrictions:
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      26.9.1   The holders of Class "I" Preference shares are not entitled to
               notice of or to vote at any meetings for the election of
               directors or at any meeting of the shareholders except as may be
               provided by the laws of the Province of British Columbia.

      26.9.2   The holders of the Class "I" Preference shares may, in each year,
               at the discretion of the directors, be paid, out of any profits
               or surplus available for dividends, non-cumulative dividends at
               such interest rate as the directors decide at the time of issue
               of the Class "I" Preference shares.

      26.9.3   The Company may, upon giving notice as provided below, redeem all
               or any of the Class "I" Preference shares on payment of ONE
               THOUSAND ($1,000.00) DOLLARS for each share to be redeemed
               (hereinafter called the "Redemption Amount"). Not less than
               thirty (30) days' notice in writing of such redemption shall be
               given by mailing such notice to the registered holders of the
               shares to be redeemed, specifying the date and place of
               redemption; and if an amount sufficient to redeem the shares is
               deposited with any trust company or chartered bank of Canada, as
               specified in the notice, on or before the date fixed for
               redemption, dividends on the Class "I" Preference shares to be
               redeemed and the rights of the holders thereof shall cease after
               the date so fixed for redemption, and the holders thereof shall
               then have no rights against the Company in respect thereof
               except, upon the surrender of certificates for such shares, to
               receive payment therefor out of the moneys so deposited.

      26.9.5   The directors may declare dividends on these Class "I" Preference
               shares without declaring dividends on shares of any other class,
               and may declare dividends on shares of any other class without
               declaring dividends on these Class "I" Preference Shares.

26.10 The Class "J" Preference shares shall have attached thereto the following
      special rights and restrictions:

      26.10.1  The holders of Class "J" Preference shares are not entitled to
               notice of or to vote at any meetings for the election of
               directors or at any meeting of the shareholders except as may be
               provided by the laws of the Province of British Columbia.

      26.10.2  The holders of the Class "J" Preference shares may, in each year,
               at the discretion of the directors, be paid, out of any profits
               or surplus available for dividends, non-cumulative dividends at
               such interest rate as the directors decide at the time of issue
               of the Class "J" Preference shares.
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      26.10.3  The Company may, upon giving notice as provided below, redeem all
               or any of the Class "J" Preference share son payment of the
               redemption/ retraction amount set out below for each share to be
               redeemed (herein called the "Redemption Amount"). Not less than
               thirty (30) days' notice in writing of such redemption shall be
               given by mailing such notice to the registered holders of the
               shares to be redeemed, specifying the date and place of
               redemption; and if an amount sufficient to redeem the shares is
               deposited with any trust company or chartered bank of Canada, as
               specified in the notice, on or before the date fixed for
               redemption, dividends on the Class "J" Preference shares to be
               redeemed and the rights of the holders thereof shall cease after
               the date so fixed for redemption, who shall thereafter have no
               rights against the Company in respect thereof except, upon the
               surrender of certificates for such shares, to receive payment
               therefor out of the moneys so deposited.

      26.10.4  Subject to the provisions of the Company Act, the Company shall,
               upon receiving notice as hereinafter provided form a holder of
               Class "J" Preference shares, redeem the number of the Class "J"
               Preference shares registered in the name of the shareholder which
               are specified in the notice by paying to such shareholder for
               each Class "J" Preference share to be redeemed the Redemption
               Amount set out below. Not less than twenty-one (21) days notice
               in writing of such redemption shall be given to the Company by
               the shareholder seeking such redemption; such notice to be
               delivered by mail to the registered office of the Company and to
               specify the number of Class "J" Preference shares to be redeemed
               and t attach the necessary number of share certificates for
               cancellation. The Company shall issue new certificates for any
               shares which are not redeemed but the certificates for which have
               been surrendered. The Company may waive any notice so required to
               be given, and such waiver, whether given before or after the
               redemption, shall cure any default in giving such notice.

      26.10.5  When issuing any Class "J" Preference Share the directors shall
               determine the amount payable by the Company to the holder for the
               redemption of such share (the "Redemption Amount"). If any Class
               "J" Preference Shares are issued as payment, in whole or in part,
               for assets transferred to the Company, including shares of the
               Company, the Redemption Amount of such Shares shall be the fair
               market value of the assets or the balance of the fair market
               value thereof, as the case may be, and the Redemption Amount of
               each such share shall be the quotient of such fair market value,
               or balance thereof, divided by the number of Class "J" Preference
               Shares issued as consideration for such assets or shares. If the
               Department of National Revenue, or other authority having
               jurisdiction, shall determine that the Redemption Amount is not
               the fair market value of the assets or shares or of the balance
               of the price for such assets or shares, as the case may be, the
               Redemption Amount for such shares as recorded in the proceedings
               of the directors shall be increased or decreased so that it shall
               be the same as the fair market value of the said assets or shares
               or 
   14

               of the balance of the price for such assets or shares, as the
               case may be, subject always to a final determination of the fair
               market value by a court of competent jurisdiction upon any appeal
               of such determination. If any or all of those shares had been
               redeemed already, then the shareholder who redeemed them shall
               pay to or receive from the Company an amount per share equaling
               the decrease or increase in the share price as determined above.

      26.10.6  The directors may declare dividends on these Class "J" Preference
               shares without declaring dividends on shares of any other class,
               and may declare dividends on shares of any other class without
               declaring dividends on these Class "J" Preference shares.

26.11 if any voluntary or involuntary liquidation, dissolution or winding up of
      the Company happens, the following shall be the priorities of the various
      classes of shares to receive what they are entitled to out of the assets
      of the Company.

      26.11.1  First priority: Shares of Preference Classes "E", "F", "G", "H",
               "I" and "J" shall all rank pari passu amongst each other, but
               shall rank in priority above all other shares.

      26.11.2  Second priority: The Class "A" Common Non-Participating Voting
               shares shall rank next in priority behind Preference Classes "E",
               "F", "G", "H", "I" and "J", but shall rank in priority above all
               other shares.

      26.11.3  Third priority: Shares of Common Stock Non-Voting Classes "B",
               "C", and "D" shall all rank pari passu amongst each other, but
               shall rank in priority behind all other shares.