IONICS INC
11-K, 2000-06-27
SPECIAL INDUSTRY MACHINERY, NEC
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                               FORM 10-K/A

                   AMENDMENT TO FORM 10-K ANNUAL REPORT

                    SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

                                 AMENDMENT NO. 1

           [ X ] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                           SECURITIES EXCHANGE ACT OF 1934

                    For the fiscal year ended: December 31, 1999

                                      OR

           [   ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                           SECURITIES EXCHANGE ACT OF 1934

             For the transition period ended:  _________________________

                           Commission File Number: 1-7211

                               IONICS, INCORPORATED
                (Exact name of registrant as specified in its charter)

        MASSACHUSETTS                                 04-2068530
  (State or other jurisdiction           (IRS Employer Identification Number)
 of incorporation or organization)

 65 Grove Street, Watertown, Massachusetts               02472
  (Address of principal executive offices)             (Zip Code)

      Registrant's telephone number, including area code: (617) 926-2500


 Securities registered pursuant to Section 12(b) of the Act:

                Title of each class: Common Stock, $1 par value

      Name of each exchange on which registered: New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

                                 None
                            (Title of Class)



<PAGE>




           The  undersigned   registrant  hereby  amends  the  following  items,
financial  statements,  exhibits or other  portions of its Annual Report on Form
10-K for the  fiscal  year  ended  December  31,  1999 as set forth in the pages
attached hereto:

1. Item 14(a) 3. of Part IV of said  report on Form 10-K is amended to list Form
11-K, Annual Report of the Ionics Section 401(k) Stock Savings Plan for the year
ended  December  31, 1999 as Exhibit  13(b)  thereto.  The Annual  Report of the
Ionics  Section  401(k)  Stock  Savings  Plan on Form  11-K for the  year  ended
December  31,  1999  is  hereby  filed  pursuant  to  Rule  15d-21  and  General
Instruction F to Form 10-K as an Exhibit to said Annual Report on Form 10-K.

           Pursuant to the requirements of the Securities  Exchange Act of 1934,
the  registrant has duly caused this amendment to be signed on its behalf by the
undersigned, thereunto duly authorized.

                                                      IONICS, INCORPORATED
                                                          (Registrant)



Date:  June 27, 2000                                   By  /s/Stephen Korn
                                                       -----------------------
                                                           Stephen Korn
                                                           Vice President and
                                                           General Counsel


<PAGE>




                                   PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a) 1.   Financial Statements

         See Index to Financial and Financial  Statement Schedules on page IV-8.
         The  Financial  Statement  Schedules  are filed as part of this  Annual
         Report on Form 10-K.

2.       Financial Statement Schedules

         See Index to Financial Statements and Financial Statement Schedules on
         page IV-8.

3.       Exhibits

         Exhibit No.       Description

3.0      Articles of Organization and By-Laws

         3.1      Restated Articles of Organization filed April 16, 1986      *
                  (filed as Exhibit 3.1 to the Company's Annual Report
                  on Form 10-K for the year ended December 31, 1997).


         3.1(a)   Amendment to Restated Articles of Organization              *
                  filed June 19, 1987 (filed as Exhibit 3.1(a) to the
                  Company's Annual Report of Form 10-K for the year
                  ended December 31, 1997).

         3.1(b)   Amendment to Restated Articles of Organization              *
                  filed May 13, 1988 (filed as Exhibit 3.1(b) to
                  Registration Statement No. 33-38290 on Form S-2
                  effective January 24, 1991).

         3.1(c)   Amendment to Restated Articles of Organization              *
                  filed May 8, 1992 (filed as Exhibit 3.1 to the
                  Company's Quarterly Report on Form 10-Q for the
                  quarterly period ending June 30, 1996).

         3.1(d)   Amendment to Restated Articles of Organization              *
                  filed May 8, 1998 (filed as Exhibit 3.1 to the
                  Company's Quarterly Report on Form 10-Q for the
                  quarterly period ending March 31, 1998).


<PAGE>


         3.2      By-Laws,  as amended  through  November  14, 1997           *
                  (filed  as   Exhibit   3.2  to  the
                  Company's Annual Report on Form 10-K for the
                  year ended December 31, 1997)

         4.0      Instruments defining the rights of security holders, including
                  indentures

                  4.1      Renewed Rights Agreement, dated as of August 19,   *
                           1997 between Registrant and BankBoston N.A. (filed
                           as Exhibit 1 to the Company's Current Report on
                           Form 8-K dated August 27, 1997).

                  4.2      Form of Common Stock Certificate (filed as         *
                           Exhibit 4.2 to the Company's Annual Report on Form
                           10-K for the year ended December 31, 1997)

         10.0              Material Contracts

                  10.1     1979 Stock Option Plan,  as amended  through       *
                           February 22, 1996  (filed as Exhibit  10.1
                           to the Company's  Annual Report on Form 10-K
                           for the year ended December 31, 1995).

                  10.2     1986  Stock  Option  Plan  for  Non-Employee       *
                           Directors, as amended through February 19,
                           1997 (filed as Exhibit 10.2 to the Company's
                           Annual  Report  on Form  10-K  for the  year
                           ended December 31, 1996).

                  10.3     Amended  and   Restated   Credit   Agreement       *
                           between the  Company and the First National
                           Bank of Boston dated as of December 31, 1992
                           (filed  as  Exhibit  10.3  to the  Company's
                           Annual  Report for the year  ended  December
                           31, 1997).

                  10.3(1)  Amendment  Agreement  No.  1,  dated  as  of       *
                           December  31, 1995, to Amended and Restated
                           Credit Agreement between the Company and The
                           First  National  Bank of  Boston  (filed  as
                           Exhibit  10.2(1)  to  the  Company's  Annual
                           Report  on  Form  10-K  for the  year  ended
                           December 31, 1995).

                  10.3(2)  Amendment Agreement No. 2, dated as of December    *
                           31,  1998,  to Amended and  Restated  Credit
                           Agreement between the Company and BankBoston
                           N.A.   (filed  as  Exhibit  10.3(2)  to  the
                           Company's Annual Report on Form 10-K for the
                           year ended December 31, 1998).


<PAGE>




                 10.4      Operating  Agreement  dated as of  September 27,   *
                           1989  between   the   Company  and  Aqua  Cool
                           Enterprises,  Inc.  (filed as Exhibit 10.4 to the
                           Company's Annual Report on Form 10-K for the year
                           ended December 31, 1997).

                 10.5      Term Lease Master Agreement dated as of September  *
                           27,  1989  between  the  Company  and Aqua Cool
                           Enterprises,  Inc.  (filed as Exhibit 10.5 to the
                           Company's Annual Report on Form 10-K for the year
                           ended December 31, 1997).

                 10.6      Option Agreement dated as of September 27, 1989    *
                           among the Company, Aqua Cool Enterprises, Inc.
                           and the other parties named therein (filed as Exhibit
                           to the Company's registration statement on Form
                           S-2, No. 33-38290, effective January 24, 1991).

                 10.7      1994 Restricted Stock Plan (filed as Exhibit       *
                           10.12 to the Company's Annual Report on Form 10-K
                           dated March 30, 1995).

                 10.8      1997 Stock Incentive Plan (filed as Exhibit 10.12  *
                           to the Company's Annual Report on Form 10-K dated
                           December 31, 1996).

                 10.9      Ionics, Incorporated Supplemental Executive        *
                           Retirement Plan effective as of January 1, 1996
                           (filed as Exhibit 10.9 to the Company's Annual
                           Report on Form 10-K dated December 31, 1997).

                 10.10     Form of Employee Retention Agreement dated         *
                           February 24, 1998 between the Company and
                           certain officers of the Company and its
                           subsidiaries (filed as Exhibit 10.10 to the
                           Company's Annual Report on Form 10-K dated
                           December 31, 1997).

                 10.11     1998 Non-Employee Directors Fee Plan (filed        *
                           as Exhibit 10.1 to the Company's Quarterly
                           Report on Form 10-Q for the quarterly period
                           ending September 30, 1998).



<PAGE>



         13.0(a)      Annual Report to  Stockholders of the Company for the year
                      ended  December  31,  1999   (constituting  the  following
                      sections:  Management's Discussion and Analysis of Results
                      of   Operations   and  Financial   Condition;   Report  of
                      Independent   Accountants;   Consolidated   Statements  of
                      Operations;   Consolidated  Balance  Sheets;  Consolidated
                      Statements  of  Cash  Flow;   Consolidated  Statements  of
                      Stockholders'  Equity;  Notes  to  Consolidated  Financial
                      Statements;  Selected  Financial Data; Board of Directors;
                      Corporate  Officers;  Location of Principal  Subsidiaries,
                      Offices and Affiliates Worldwide;  Corporate Headquarters;
                      Trading  Information;  Form  10-K  Annual  Report;  Annual
                      Meeting; Auditors; and Transfer Agent and Registrar).

             (b)      Annual Report of the Ionics  Section  401(k) Stock Savings
                      Plan on Form 11-K for the year ended December 31, 1999.

         21.0         Subsidiaries of the Registrant.

         23.0         Consents

                      23.1     Consent of PricewaterhouseCoopers LLP to
                               incorporation by reference of that firm's
                               report  dated  February 22,  2000,  which is
                               included  on page 21 of the Registrant's
                               Annual Report to Stockholders for the year
                               ended December 31, 1999.

         24.0         Power of Attorney.

         27.0         Financial Data Schedule.                               **
--------------------------------
*        incorporated herein by reference
**       for electronic purposes only


<PAGE>


                             EXHIBIT INDEX


     Exhibit
     No.          Description


     3.0          Articles of Organization and By-Laws

                  3.1    Restated Articles of Organization filed             *
                         April 16, 1986 (filed as Exhibit 3.1 to the
                         Company's Annual Report on Form 10-K for the
                         year ended December 31, 1997).

                  3.1(a) Amendment to the Restated Articles of               *
                         Organization filed June 19, 1987 (filed
                         as Exhibit 3.1(a) to the Company's Annual
                         Report on Form 10-K for the year ended
                         December 31, 1997).

                  3.1(b) Amendment to Restated Articles of                   *
                         Organization  filed  May 13,  1988  (filed
                         as Exhibit 3.1(b) to  Registration Statement
                         No. 33-38290 on Form S-2 effective January
                         24, 1991).

                  3.1(c) Amendment to Restated Articles of                   *
                         Organization filed May 8, 1992
                         (filed as Exhibit 3.1 to the Company's
                         Quarterly Report on Form 10-Q for the quarterly
                         period ending June 30, 1996).

                  3.1(d) Amendment to Restated Articles of                   *
                         Organization filed May 8, 1998
                         (filed as Exhibit 3.1 to the Company's
                         Quarterly Report on Form 10-Q for the
                         quarterly period ending March 31, 1998).

                  3.2    By-Laws, as amended through November 14, 1997       *
                         (filed as Exhibit 3.2 to the Company's Annual
                         Report on Form 10-K for the year ended
                         December 31, 1997).

     4.0          Instruments defining the rights of security holders,
                  including indentures

                  4.1    Renewed Rights Agreement, dated as of               *
                         August 19, 1997 between Registrant and
                         BankBoston N.A. (filed as Exhibit 1 to
                         dated August 27, 1997).

                  4.2    Form of Common Stock Certificate (filed as          *
                         Exhibit 4.2 to the Company's Annual Report
                         on Form 10-K for the year ended
                         December 31, 1997).


<PAGE>


    10.0                 Material Contracts

                10.1     1979 Stock Option Plan, as amended through          *
                         February 22, 1996 (filed as Exhibit 10.1 to
                         the Company's Annual Report on Form 10-K for the
                         year ended December 31, 1995).

                10.2     1986 Stock Option Plan for Non-Employee Directors,  *
                         as amended through February 19, 1997 (filed as
                         Exhibit 10.2 to the Company's Annual Report on
                         Form 10-K for the year ended December 31, 1996).

                10.3     Amended and Restated Credit Agreement between       *
                         the Company and the First National Bank of Boston
                         dated as of December 31, 1992 (filed as
                         Exhibit 10.3 to the Company's Annual Report
                         for the year ended December 31, 1997).

                10.3(1)  Amendment Agreement No. 1, dated as of              *
                         December 31, 1995, to Amended and Restated
                         Credit Agreement between the Company and The
                         First National Bank of Boston (filed as Exhibit
                         10.3(1) to the Company's Annual Report on Form 10-K
                         for the year ended December 31, 1995).

                10.3(2)  Amendment Agreement No. 2, dated as of              *
                         December 31, 1998, to Amended and Restated
                         Credit Agreement between the Company and
                         BankBoston N.A. (filed as Exhibit 10.3(2) to the
                         Company's Annual Report on Form 10-K for the
                         year ended December 31, 1998).

                  10.4   Operating Agreement dated as of September 27,       *
                         1989 between the Company and Aqua Cool
                         Enterprises, Inc. (filed as Exhibit 10.4 to
                         the Company's Annual Report on Form 10-K for
                         the year ended December 31, 1997).

                  10.5   Term Lease Master Agreement dated as of             *
                         September 27, 1989 between the Company and
                         Aqua Cool Enterprises, Inc. (filed as
                         Exhibit 10.5 to the Company's Annual Report on
                         Form 10-K for the year ended December 31, 1997).

                  10.6   Option Agreement dated as of September 27, 1989     *
                         among the Company, Aqua Cool Enterprises, Inc.
                         and the other parties named therein (filed as
                         Exhibit 10.6 to the Company's registration
                         statement on Form S-2, No. 33-38290,
                         effective January 24, 1991).

                  10.7   1994 Restricted Stock Plan (filed as Exhibit 10.12  *
                         to the Company's Annual Report on Form 10-K dated
                         March 30, 1995).
<PAGE>


                  10.8   1997 Stock Incentive Plan (filed as Exhibit 10.12   *
                         to the Company's Annual Report on Form 10-K dated
                         December 31, 1996).

                  10.9   Ionics, Incorporated Supplemental Executive         *
                         Retirement Plan effective as of January 1, 1996
                         (filed as Exhibit 10.9 to the Company's Annual
                         Report on Form 10-K dated December 31, 1997).

                  10.10  Form of Employee Retention Agreement dated          *
                         February 24, 1998 between the Company and
                         certain officers of the Company and its
                         subsidiaries (filed as Exhibit 10.10 to the
                         Company's Annual Report on Form 10-K dated
                         December 31, 1997).

                  10.11  1998 Non-Employee Directors Fee Plan (filed         *
                         as Exhibit 10.1 to the Company's Quarterly
                         Report on Form 10-Q for the quarterly period
                         ending September 30, 1998).

13.0(a)     Annual Report to Stockholders of the Company for the year
            ended December 31, 1999 (constituting the following sections:
            Management's Discussion and Analysis of Results of Operations
            and Financial Condition; Report of Independent Accountants;
            Consolidated Statements of Operations; Consolidated Balance
            Sheets; Consolidated Statements of Cash Flow; Consolidated
            Statements of Stockholders' Equity; Notes to Consolidated
            Financial Statements; Selected Financial Data; Board of Directors;
            Corporate Officers; Location of Principal Subsidiaries, Offices
            and Affiliates Worldwide; Corporate Headquarters; Trading Informa-
            tion; Form 10-K Annual Report; Annual Meeting; Auditors; and
            Transfer Agent and Registrar).

    (b)     Annual Report of the Ionics Section 401(k) Stock Savings Plan
            on Form 11-K for the year ended December 31, 1999.

21.0        Subsidiaries of the Registrant

23.0        Consents

            23.1   Consent of PricewaterhouseCoopers  LLP to incorporation
                   by reference of that firm's  report dated  February 22,
                   2000,  which is included on page 21 of the Registrant's
                   Annual  Report  to  Stockholders  for  the  year  ended
                   December 31, 1999.

24.0        Power of Attorney.

27.0        Financial Data Schedule.                                       **
--------------------------------
*        incorporated herein by reference
**       for electronic purposes only


<PAGE>



             Exhibit No. 13(b) to Annual Report on Form 10-K
        of Ionics, Incorporated for the year ended December 31, 1999




                   SECURITIES AND EXCHANGE COMMISSION

                         WASHINGTON, D.C. 20549


                                FORM 11-K




(Mark One)

[X] Annual report pursuant to Section 15(d) of the Securities Exchange Act of
    1934

                  For the fiscal year ended December 31, 1999

                                   OR

[ ] Transition report pursuant to Section 15(d) of the Securities Exchange Act
    of 1934

             For the transition period from _________ to _________

                         Commission File Number: 1-7211
                                                 ------



A.  Full title of the plan and the address of the plan, if different from that
    of the issuer named below:

                   Ionics Section 401(k) Stock Savings Plan

B.  Name of issuer of the securities held pursuant to the plan and the address
    of its principal executive office:

                             IONICS, INCORPORATED

                                 65 Grove Street

                       Watertown, Massachusetts 02472-2882


<PAGE>


                  IONICS SECTION 401(k) STOCK SAVINGS PLAN

             INDEX OF FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULES
                 For the years ended December 31, 1999 and 1998

                                  --------




                                                                Page(s)

Independent Auditors Report                                        2

Financial Statements:

        Statements of Net Assets Available for Plan Benefits
        at December 31, 1999 and 1998                            3-4

        Statements of Changes in Net Assets Available for
        Plan Benefits for the years ended December 31,
        1999 and 1998                                            5-6

Notes to Financial Statements                                    7-11

Supplemental Schedules:

        Schedule of Assets Held for Investment Purposes, at
        December 31, 1999                                        12

        Schedule of Reportable Transactions
        for the year ended December 31, 1999                     13







<PAGE>


                        INDEPENDENT AUDITOR'S REPORT


Administrators
Ionics Section 401(k) Stock Savings Plan
Watertown, Massachusetts

We  have  audited  the  accompanying  statements  of  net  assets
available for plan benefits of the Ionics Section 401(k) Stock Savings Plan (the
Plan) as of December 31, 1999 and 1998, and the related  statement of changes in
net assets available for plan benefits for the years then ended. These financial
statements  and the schedules  referred to below are the  responsibility  of the
plan  administrator.  Our  responsibility  is to  express  an  opinion  on these
financial statements and schedules based on our audits.

We conducted our audits in  accordance  with  generally  accepted
auditing standards.  Those standards require that we plan and perform the audits
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 net assets  available for plan
benefits of the Plan as of December 31, 1999 and 1998 and the changes in its net
assets  available for plan benefits for the years then ended, in conformity with
generally accepted accounting principles.

Our audits were made for the purpose of forming an opinion on the
basic  financial  statements  taken as a whole.  The  supplemental  schedules of
assets held for  investment  purposes,  reportable  transactions  and  nonexempt
transactions  are  presented  for purposes of complying  with the  Department of
Labor Rules and  Regulations  for  Reporting and  Disclosure  under the Employee
Retirement  Income Security Act of 1974 and are not a required part of the basic
financial  statements.  Such  schedules  have  been  subjected  to the  auditing
procedures  applied in the audit of the basic  financial  statements and, in our
opinion,  are fairly stated, in all material respects,  in relation to the basic
financial statements taken as a whole.

                                                    /s/BELANGER & COMPANY, P.C.
                                                    CERTIFIED PUBLIC CCOUNTANTS

Chelmsford, Massachusetts
June 13, 2000

                                    -2-


<PAGE>

<TABLE>
<CAPTION>

                   IONICS SECTION 401(K) STOCK SAVINGS PLAN
               STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS
               ---------------------------------------------------
                       FOR THE YEAR ENDED DECEMBER 31, 1999


                                                            Participant-Directed Funds
                                              -------------------------------------------------------
                            Ionics, Inc.                                     Indexed        Asset        Indexed
                                  Common        Puritan      Contrafund         Bond      Manager         Equity
                              Stock Fund           Fund            Fund         Fund         Fund           Fund       Sub-Total
                              ----------          -----           -----        -----        -----          -----       ---------

<S>                         <C>                 <C>          <C>             <C>          <C>            <C>           <C>
Assets:
Investments @ Market
(See Notes 2, 3 & 7)
Ionics, Incorporated
Common Stock:
393,964 shares @
$28.125 per share             11,079,956                                                                              11,079,956
Puritan Fund:
116,781.69 shares @
$19.03 per share                              2,222,346                                                                2,222,346
Contrafund Fund:
89,089.624 shares @
$60.02 per share                                              5,347,159                                                5,347,159

Indexed Bond Fund:
38,956.132 shares @
$9.94 per share                                                              387,224                                     387,224

Asset Manager Fund:
80,994.071 shares @
$14.49 per share                                                                        1,172,879                      1,172,879

Indexed Equity Fund:
80,994.071 shares @
$14.49 per share                                                                                         480,978         480,978

Janus Worldwide Fund:
13,831.108 shares @
$76.43 per share

BT Pyramid GIC Fund

Cash & Cash

Equivalents                      158,592                                                                                 158,592
Accounts Receivable:
From Sponsor
From Plan Participants

Loans Receivable from

Plan Participants
                                       -              -               -            -            -              -               -
Total Assets                  11,238,548      2 222,346       5,347,159      387,224    1,172,879        480,978      20,849,134
                             -----------     ----------      ----------     --------   ----------       --------      ----------

Liabilities                            0              0               0            0            0              0               0
Net Assets Available
for Plan Benefits            $11,238,548     $2,222,346      $5,347,159     $387,224   $1,172,879       $480,978     $20,849,134
                             ===========     ==========      ==========     ========   ==========       ========     ===========

</TABLE>

-3-                                                               Page 1 of 2


<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                                STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1999


                                                                 Participant-Directed Funds
                                                           ------------------------------------------
                                                       Janus             BT
                                                   Worldwide        Pyramid         Participant          Cash/
                               Sub-Total                Fund       GIC Fund               Loans          Other        Total
                               ---------               -----      ---------               -----          -----        -----

<S>                            <C>                 <C>            <C>               <C>                  <C>          <C>
Assets:
Investments @ Market
(See Notes 2, 3 & 7)
Ionics, Incorporated
Common Stock:
393,964 shares @
$28.125 per share             11,079,956                                                                         11,079,956

Puritan Fund:
116,781.69 shares @
$19.03 per share               2,222,346                                                                          2,222,346

Contrafund Fund:
89,089.624 shares @
$60.02 per share               5,347,159                                                                          5,347,159

Indexed Bond Fund:
38,956.132 shares @
$9.94 per share                  387,224                                                                            387,224

Asset Manager Fund:
80,994.071 shares @
$14.49 per share               1,172,879                                                                          1,172,879

Indexed Equity Fund:
80,994.071 shares @
$14.49 per share                 480,978                                                                            480,978

Janus Worldwide Fund:
13,831.108 shares @
$76.43 per share                                   1,057,112                                                      1,057,112

BT Pyramid GIC Fund                                               1,129,641                                       1,129,641

Cash & Cash                      158,592                                                                            158,592
Equivalents

Amounts Receivable:
From Sponsor                                                                                            58,744       58,744
From Plan Participants                                                                                 245,022      245,022

Loans Receivable from

Plan Participants                                                                       802,614                     802,614
                                       -                   -              -            --------              -     --------
Total Assets                  20,849,134           1,057,112      1,129,641             802,614        303,766   24,142,267
                              ----------           ---------      ---------            --------        -------   ----------

Liabilities                                                0              0                   0              0            0

Net Assets Available

for Plan Benefits            $20,849,134          $1,057,112     $1,129,641            $802,614       $303,766  $24,142,267
                             ===========          ==========     ==========            ========       ========  ===========
</TABLE>

The accompanying notes are an integral part of these financial statements.

-3-                                                               Page 2 of 2


<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                                STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1998


                                                                   Participant-Directed Funds
                                                    -------------------------------------------------------
                            Ionics, Inc.                                     Indexed        Multi        Indexed
                                  Common        Puritan      Contrafund         Bond        Asset         Equity
                              Stock Fund           Fund            Fund         Fund         Fund           Fund       Sub-Total
                              ----------          -----           -----        -----        -----          -----       ---------
<S>                         <C>                 <C>          <C>             <C>            <C>          <C>           <C>
Assets:
Investments @ Market
(See Notes 2, 3 & 7)
Ionics, Incorporated
Common Stock:
362,638 shares @
$29.9375 per share            10,856,475                                                                              10,856,475
Puritan Fund:
112,008.059 shares @
$20.07 per share                              2,248,001                                                                2,248,001
Contrafund Fund:
79,138.441 shares @
$56.79 per share                                              4,494,272                                                4,494,272

Indexed Bond Fund:
31,702.851 shares @
$10.93 per share                                                             346,512                                     346,512

Multi Asset Fund:
69,193.101 shares @
$15.36 per share                                                                        1,047,446                      1,047,446

Indexed Equity Fund:
10,428.7631 shares @
$33.39 per share                                                                                         348,217         348,217

Janus Worldwide Fund:
11,714.329 shares @
$47.36 per share

BT Pyramid GIC Fund

Cash & Cash

Equivalents                      202,839                                                                                 202,839
Accounts Receivable:
From Sponsor
From Plan Participants

Loans Receivable from

Plan Participants
                                       -              -               -            -            -              -               -
Total Assets                  11,059,314      2,248,001       4,494,272      346,512    1,047,446        348,217      19,543,762
                             -----------     ----------      ----------     --------   ----------       --------      ----------

Liabilities                            0              0               0            0            0              0               0
Net Assets Available
for Plan Benefits            $11,059,314     $2,248,001      $4,494,272     $346,512   $1,047,446       $348,217     $19,543,762
                             ===========     ==========      ==========     ========   ==========       ========     ===========
</TABLE>


-4-                                                        Page 1 of 2


<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                                STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1998

                                                                        Participant-Directed Funds
                                                               ------------------------------------------
                                                       Janus             BT
                                                   Worldwide        Pyramid         Participant          Cash/
                               Sub-Total                Fund       GIC Fund               Loans          Other        Total
                               ---------               -----      ---------               -----          -----        -----
<S>                            <C>                 <C>            <C>               <C>                  <C>          <C>
Assets:
Investments @ Market
(See Notes 2, 3 & 7)
Ionics, Incorporated
Common Stock:
362,638 shares @
$29.9375 per share            10,856,475                                                                         10,856,475

Puritan Fund:
112,008.059 shares @
$20.07 per share               2,248,001                                                                          2,248,001

Contrafund Fund:
79,138.441 shares @
$56.79 per share               4,494,272                                                                          4,494,272

Indexed Bond Fund:
31,702.851 shares @
$10.93 per share                 346,512                                                                            346,512

Multi Asset Fund:
68,193.101 shares @
$15.36 per share               1,047,446                                                                          1,047,446

Indexed Equity Fund:
10,428.7631 shares @
$33.39 per share                 348,217                                                                            348,217

Janus Worldwide Fund:
11,714.329 shares @
$47.36 per share                                     554,791                                                        554,791

BT Pyramid GIC Fund                                               1,165,028                                       1,165,028

Cash & Cash

Equivalents                      202,839                                                                            202,839

Amounts Receivable:
From Sponsor                                                                                            60,046       60,046
From Plan Participants                                                                                 232,343      232,343

Loans Receivable from

Plan Participants                                                                       792,691                     792,691
                                       -                   -              -            --------              -     --------
Total Assets                  19,543,762             554,791      1,165,028             792,691        292,389   22,348,661
                              ----------             -------      ---------            --------        -------   ----------

Liabilities                            0                   0              0                   0              0            0

Net Assets Available

for Plan Benefits            $19,543,762            $554,791     $1,165,028            $792,691       $292,389  $22,348,661
                             ===========            ========     ==========            ========       ========  ===========
</TABLE>

The accompanying notes are an integral part of these financial statements.

-4-                                                      Page 2 of 2


<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                          STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1999




                                                                                       Participant-Directed Funds
                                                                  ----------------------------------------------------------
                            Ionics, Inc.                                     Indexed        Asset        Indexed
                                  Common        Puritan      Contrafund         Bond      Manager         Equity
                              Stock Fund           Fund            Fund         Fund         Fund           Fund       Sub-Total
                              ----------          -----           -----        -----        -----          -----       ---------
<S>                           <C>             <C>             <C>            <C>        <C>              <C>          <C>
Net Assets Available
for Plan Benefits -

Beginning of Year             11,059,314      2,248,001       4,494,272      346,512    1,047,446        348,217      19,543,762
                              ----------      ---------       ---------      -------    ---------        -------      ----------

Net Investment Income
Principally Interest

and Dividends                      4,585        180,533         801,367       27,234      178,911         25,477       1,218,107

Net Appreciation
(Depreciation) in the
Fair Value of

Investments                    (740,455)      (119,424)         296,252     (35,202)     (55,610)         51,334       (603,105)

Contributions:
Participants
Employer

Acquisitions

Loan Advances
Loan Payments

Transfers                      1,665,970       (86,764)       (244,732)       48,680        2,132         55,950       1,441,236

Withdrawals by and
Distributions to

Participants                   (750,866)                                                                               (750,866)


Net Increase (Decrease)          179,234       (25,655)         852,887       40,712      125,433        132,761       1,305,372
                                 -------      --------         --------      -------     --------       --------       ---------

Net Assets Available
for Plan Benefits -

End of Year                  $11,238,548     $2,222,346      $5,347,159     $387,224   $1,172,879       $480,978     $20,849,134
                             ===========     ==========      ==========     ========   ==========       ========     ===========

</TABLE>

-5-                                                           Page 1 of 2


<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                          STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1999




                                                                  Participant-Directed Funds
                                                            ------------------------------------
                                                  Janus              BT
                                              Worldwide         Pyramid    Participant           Cash/
                               Sub-Total           Fund            Fund          Loans          Other             Total
                               ---------          -----           -----         ------          -----             -----
<S>                           <C>               <C>           <C>              <C>            <C>            <C>
Net Assets Available
for Plan Benefits -

Beginning of year             19,543,762        554,791       1,165,028        792,691        292,389        22,348,661
                              ----------        -------       ---------        -------        -------        ----------

Net Investment Income
Principally Interest

and Dividends                  1,218,107         16,995          64,240         71,932                        1,371,274

Net Appreciation
(Depreciation) in the
Fair Value of

Investments                    (603,105)        371,360                                                       (231,745)

Contributions:
Participants                                                                                2,597,904         2,597,904
Employer                                                                                      677,770           677,770

Acquisitions

Loan Advances                                                                  458,430      (458,430)                 0
Loan Payments                                                                (448,008)        448,008                 0

Transfers                      1,441,236        113,966        (99,627)                   (1,455,575)                 0

Withdrawals by and
Distributions to

Participants                   (750,866)                                      (72,431)    (1,798,300)       (2,621,597)


Net Increase (Decrease)        1,305,372        502,321        (35,387)          9,923         11,377         1,793,606
                               ---------       --------       --------          ------        -------        ----------

Net Assets Available
for Plan Benefits -

End of Year                  $20,849,134     $1,057,112      $1,129,641       $802,614       $303,766       $24,142,267
                             ===========     ==========      ==========       ========       ========       ===========
</TABLE>

The accompanying notes are an integral part of these financial statements.

-5-                                                           Page 2 of 2



<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                          STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1998




                                                                             Participant-Directed Funds
                                                                 -----------------------------------------------------
                            Ionics, Inc.                                     Indexed       Multi-        Indexed
                                  Common        Puritan      Contrafund         Bond        Asset         Equity
                              Stock Fund           Fund            Fund         Fund         Fund           Fund       Sub-Total
                              ----------          -----           -----        -----        -----          -----       ---------
<S>                         <C>                 <C>          <C>             <C>           <C>           <C>           <C>
Net Assets Available
for Plan Benefits -

Beginning of Year             12,987,729      1,903,802       3,441,509      151,279      490,991         65,041      19,040,351
                              ----------      ---------       ---------      -------      -------         ------      ----------

Net Investment Income
Principally Interest

and Dividends                      5,609        231,338         331,178       20,502      154,945         14,538         758,110

Net Appreciation
(Depreciation) in the
Fair Value of

Investments                  (3,135,925)         87,485         734,112      (2,727)     (34,794)         50,472     (2,301,377)

Contributions:
Participants
Employer

Acquisitions

Loan Advances
Loan Payments

Transfers                      1,649,130         25,376        (12,527)      177,458      436,304        218,166       2,493,907

Withdrawals by and
Distributions to

Participants                   (447,229)                                                                               (447,229)


Net Increase (Decrease)      (1,928,415)        344,199       1,052,763      195,233      556,455        283,176         503,411
                             -----------       --------       ---------      -------      -------        -------         -------

Net Assets Available
for Plan Benefits -

End of Year                  $11,059,314     $2,248,001      $4,494,272     $346,512   $1,047,446       $348,217     $19,543,762
                             ===========     ==========      ==========     ========   ==========       ========     ===========

</TABLE>

-6-                                                     Page 1 of 2



<PAGE>
<TABLE>
<CAPTION>


                                     IONICS SECTION 401(K) STOCK SAVINGS PLAN
                          STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS

                                       FOR THE YEAR ENDED DECEMBER 31, 1998




                                                                  Participant-Directed Funds
                                                              ---------------------------------
                                                  Janus              BT
                                              Worldwide         Pyramid    Participant           Cash/
                               Sub-Total           Fund            Fund          Loans          Other             Total
                               ---------          -----           -----         ------          -----             -----
<S>                            <C>            <C>               <C>         <C>               <C>            <C>
Net Assets Available
for Plan Benefits -

Beginning of year             19,040,351        237,322         965,208        682,144        263,783        21,188,808
                              ----------        -------         -------        -------        -------        ----------

Net Investment Income
Principally Interest

and Dividends                    758,110          2,132          55,803         74,167            408           890,620

Net Appreciation
(Depreciation) in the
Fair Value of

Investments                  (2,301,377)         86,030                                                     (2,215,347)

Contributions:
Participants                                                                                3,743,207         3,743,207
Employer                                                                                      778,688           778,688

Acquisitions                                                                     6,463        126,857           133,320

Loan Advances                                                                  425,845      (425,845)                 0
Loan Payments                                                                (366,140)        366,140                 0

Transfers                      2,493,907        229,307         144,017                   (2,867,231)                 0

Withdrawals by and
Distributions to

Participants                   (447,229)                                      (29,788)    (1,693,618)       (2,170,635)


Net Increase (Decrease)          503,411        317,469         199,820        110,547         28,606         1,159,853
                                 -------       --------        --------       --------        -------        ----------

Net Assets Available
for Plan Benefits -

End of Year                  $19,543,762       $554,791      $1,165,028       $792,691       $292,389       $22,348,661
                             ===========       ========      ==========       ========       ========       ===========

</TABLE>

The accompanying notes are an integral part of these financial statements.

-6-                                                             Page 2 of 2



<PAGE>


                 IONICS SECTION 401(K) STOCK STOCK SAVINGS PLAN

                           NOTES TO FINANCIAL STATEMENTS

                                DECEMBER 31, 1999

Note 1:  THE PLAN AND ITS PROVISIONS

The Ionics  Section  401(k) Stock  Savings Plan (the  "Plan")  became  effective
January  1,  1986.  Effective  May 1,  1994,  the Plan was  amended to provide a
broader range of investment selections for Plan participants and the opportunity
to change  investment  elections on a quarterly  basis.  Other amendments to the
Plan were also adopted,  including  provisions to permit  participants to borrow
from their  accounts.  On August 25, 1997,  the Plan was amended to increase the
number of investment options,  reduce the period for changing contribution rates
from quarterly to monthly,  and institute daily account valuation.  In addition,
the  trustee  was  changed  from  PNC  Bank  to New  York  Life  Trust  Company.
Participants  should refer to the Summary Plan  Description  for a more complete
description of the Plan's provisions.

General

           The Plan is a  defined  contribution  plan  qualified  under  Section
401(k) of the U.S.  Internal  Revenue Code covering all  permanent  employees of
Ionics,  Incorporated and domestic subsidiaries (the "Company") working at least
20 hours per week who have  completed  one year of service  (effective  March 1,
2000,  the Plan was  amended  to permit  new  employees  to become  eligible  to
participate  in the Plan  effective as of the first day of the month  coincident
with or next following the employee's date of hire). The Plan was established to
provide  benefits to participants  upon  retirement,  termination of employment,
death,  permanent and total disability,  or demonstration of financial hardship.
The Plan is subject to the provisions of the Employee Retirement Income Security
Act of 1974.

Investment Options

           The following investment options are available to participants:

           Ionics,  Incorporated  Common Stock Fund - This fund invests directed
contributions solely in common stock of the Company.

           Fidelity  Puritan Fund - This mutual fund  maintains a broadly  based
conservatively  managed  diversified  investment  portfolio  which is  primarily
income  oriented with a secondary  emphasis on growth.  Its  portfolio  consists
principally of high yielding common and preferred stocks and corporate bonds.

           Fidelity  Contrafund - This mutual fund  invests  primarily in common
stocks  and  securities   convertible  into  common  stocks,   and  has  capital
appreciation as its investment objective.

           MainStay  Institutional  Indexed Bond Fund - This income  mutual fund
invests in investment grade corporate and U.S. Government bonds, mortgage-backed
securities and asset-backed securities.  The fund measures itself by the Salomon
Brothers Broad Investment Grade Bond Index.

           MainStay  Institutional  Asset  Manager  Fund - This fund is an asset
allocation mutual fund which varies the amount invested in each class of assets,
based on  anticipated  risks and returns  associated  with each class.  The fund
invests in domestic and foreign common stocks, fixed income securities and money
market instruments. Its objective is to maximize total return.

                                    - 7 -


<PAGE>



           MainStay  Institutional  Indexed  Equity Fund - This fund is a growth
and income mutual fund. The fund seeks to correspond  with the Standard & Poor's
Composite Index of 500 Stocks.

           Janus  Worldwide  Fund  -  This  fund  seeks  long-term  growth  with
preservation  of capital.  It invests  mainly in common  stocks of domestic  and
foreign issuers. It will normally invest in issuers from at least five different
countries,  including  the United  States.  Foreign  investing may be subject to
greater risks than domestic investing.

           BT Pyramid GIC Fund - This fund,  administered  by The Bankers  Trust
Company,   invests  primarily  in  Guaranteed   Investment  Contracts  and  Bank
Investment Contracts and Bankers Trust Commingled  short-term  investment funds,
and has as its objectives safety of principal,  stability, superior yields and a
predictable  annual  return.  The fund sets an  estimated  range of return on an
annual  basis,  but  because  results  can be  affected  by  economic  or market
conditions, it does not guarantee the rate.

           All cash transactions,  including contributions, fund purchases, fund
liquidations,  loans,  distributions,  etc. were made through a conduit account,
which is an interest  bearing cash account  with the PNC Bank,  New England.  On
August 25, 1997 this  account was changed to the  MainStay  Institutional  Money
Market Fund.

           Participant Contributions

           Employees who meet certain length of service  requirements  may elect
to become  participants in the Plan and contribute,  on a pre-tax basis, from 1%
to 12% of their  compensation  as  defined by the Plan.  The  annual  amounts so
contributed by employees are subject to certain federal income tax  limitations.
Contributions  made by  employees  to the  Plan may be used to  purchase  either
common  stock of the  Company or may be  directed  to be  invested in any of the
available investment funds.

           Participant Accounts

           Each  participant's   account  is  credited  with  the  participant's
contribution and an allocation of Plan earnings.  Allocations are based on total
investment earnings and average participant investment balances, as defined.

           Company Contribution

           The terms and  conditions  of the Plan  provide  for the  Company  to
contribute  50% of the first 6% an employee  elects to invest in common stock of
the Company (subject to certain limitations). The maximum annual amount that the
Company may  contribute on behalf of employees is currently  $900,000,  and that
limit  is set by the  Board  of  Directors  of  the  Company.  Matching  Company
contributions under the Plan are invested solely in common stock of the Company.
Non-vested  Company  contributions  may,  subject  to certain  restrictions,  be
forfeited upon  withdrawal of the employee from the Plan and be used as a credit
to reduce future Company contributions.

           Vesting

           All  participant  contributions  are 100% vested  when made.  Company
matching  contributions are vested in increasing  percentages based on the years
of  service  of the  individual  employee,  from 33 1/3% after two years to 100%
after four years.

           Plan Expenses

           The  Plan   provides   that  all   expenses   of  the  Plan  and  its
administration shall be paid by the Company.

                                    - 8 -

<PAGE>



           Withdrawals

           A  participant  can  make a  hardship  withdrawal  of his or her  own
contributions,  subject to Internal Revenue Service restrictions.  A participant
may withdraw the entire vested amount due to his or her own contributions  after
attaining age 59 1/2.

           Loans

           A participant can borrow money from his or her vested account subject
to certain rules  including a minimum  amount of $1,000 and a maximum amount not
to exceed the lesser of 50% of the participant's total vested account balance or
$50,000.

Note 2:    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

           Basis of Presentation

           The  accompanying  financial  statements are presented on the accrual
basis of accounting.

           Valuation of Investments

           Investment of the Plan in Ionics, Incorporated common stock is stated
at market,  market  being the last sale price on  December  31,  1999 of Ionics,
Incorporated   common  stock  as  reported  on  the  New  York  Stock  Exchange.
Investments in the Plan of the Fidelity Funds, the Mainstay  Institutional Funds
and the BT  Pyramid  GIC Fund are  stated  at the Net  Asset  Value of the funds
reported as of December 31, 1999.

           The Plan presents in the statement of changes in net assets available
for plan benefits the net appreciation  (depreciation)  in the fair value of its
investments  which  consist  of  realized  gains or  losses  and the  unrealized
appreciation (depreciation) of these investments.

           Payment of Benefits

           Benefits are recorded when paid.

                                   - 9 -

<PAGE>



Note 3:    INVESTMENTS

           The  following is a summary of  investments  at December 31, 1999 and
1998, respectively:
<TABLE>
<CAPTION>

                                         Market Value                        Cost
                                     1999           1998             1999            1998
                                   ----------     -----------     -----------      ---------
<S>                                <C>            <C>             <C>            <C>
Investments At Fair Value
As Determined By Quoted
Market Price

Ionics, Incorporated
 Common Stock                      $11,079,956    $10,856,475     $11,012,229    $ 9,964,585

Fidelity Investments:
 Puritan                             2,222,346      2,248,001       2,075,535      1,952,133
 Contrafund                          5,347,159      4,494,272       4,160,599      3,365,420

Mainstay Institutional:

 Indexed Bond                          387,224        346,512         428,591        353,422
 Asset Manager                       1,172,879      1,047,446       1,289,827      1,113,981
 Indexed Equity                        480,978        348,217         401,723        301,639
 Money Market                          158,592        202,839         158,592        202,839

Janus Worldwide Fund:                1,057,112        554,791         642,677        484,674

BT Pyramid GIC Fund:                 1,129,641      1,165,028       1,129,641      1,165,028

Other Investments:

Participant Loans                      802,614        792,691         802,614        792,691
                                      --------       --------        --------       --------
                                   $22,838,501    $22,056,272     $22,102,028    $19,696,412
                                   ===========    ===========     ===========    ===========

</TABLE>


Note 4:         INCOME TAX STATUS
                -----------------

                         The  Internal   Revenue   Service  has  determined  and
                informed the Company by a letter dated  September  12, 1995 that
                the Plan is qualified and the trust  established  under the Plan
                is tax-exempt, under the appropriate sections of the Code.

                                   -10-


<PAGE>



Note 5: PLAN TERMINATION

Although it has not  expressed any intent to do so, the
Company  has  the  right  under  the  Plan  to  discontinue  its
contributions  at any time and to terminate  the Plan subject to
the  provisions  of  ERISA.  In the  event of Plan  termination,
participants will become 100 percent vested in their accounts.

Note 6: RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500
        ---------------------------------------------------

The  following  is  a  reconciliation   of  net  assets
available for benefits per the financial  statements at December
31, 1999 and 1998 to Form 5500:

                                                   1999                 1998
                                                ----------           ----------

Net assets available for benefits
per the financial statements                   $24,142,267          $22,348,661

Amounts allocated to withdrawing
participants                                       (88,211)            (171,046)
                                                  --------            ---------

Net assets available for benefits
per the form 5500                              $24,054,056          $22,177,615
                                               ===========          ===========


The following is a  reconciliation  of benefits paid to
participants  per the  financial  statements  for the year ended
December 31, 1999 to Form 5500:

Distributions to participants per the
financial statements:                                               $ 2,621,597

Add: Amounts allocated to withdrawing
participants at December 31, 1999                                        88,211

Less: Amounts allocated to withdrawing
participants at December 31, 1998                                     ( 171,046)
                                                                    ------------

Benefits paid to participants per Form 5500                          $2,538,762

Amounts  allocated  to  withdrawing   participants  are
recorded  on the Form  5500 for  benefit  claims  that have been
processed  and approved for payment prior to December 31 but not
 yet paid as of that date.

                                                       -11-


<PAGE>



ATTACHMENT TO FORM 5500
EIN: 04-2068530
PN:  003

SCHEDULE I
<TABLE>
<CAPTION>

                        IONICS SECTION 401(K) STOCK SAVINGS PLAN

                ITEM 27a - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES

                                   DECEMBER 31, 1999

                                                     Face Amount,
                                                     Shares or                            Current
Description of Investment                               Rate              Cost              Value
-------------------------                            ----------------- ----------       ---------------
<S>                                                     <C>            <C>                <C>
Ionics, Incorporated
  Common Stock                                          393,954        $11,012,229        $11,079,956

Fidelity Investments:
  Puritan Fund                                          116,781          2,075,535          2,222,346
  Contrafund                                             89,090          4,160,599          5,347,159

MainStay Institutional:
   Indexed Bond                                          38,956            428,591            387,224
   Asset Manager Fund                                    80,990          1,289,827          1,172,879
   Indexed Equity Fund                                   12,617            401,723            480,978
   Money Market                                                            158,592            158,592

Janus Worldwide Fund                                     13,831            642,677          1,057,112

BT Pyramid GIC Fund                                                      1,129,641          1,129,641

Participant Loans

(Rate of Interest 7.43% to 10.50%)                                               0            802,614
                                                                                --           --------

    Total Funds Invested                                               $21,299,414        $23,838,501
                                                                       ===========        ===========
</TABLE>

The  accompanying   notes  are  an  integral  part  of  these
supplemental schedules.

                                                       -12-


<PAGE>





ATTACHMENT TO FORM 5500          SCHEDULE II
EIN: 04-2068530
PN:  003
<TABLE>
<CAPTION>

                      IONICS SECTION 401(K) STOCK SAVINGS PLAN
                   ITEM 27D - SCHEDULE OF REPORTABLE TRANSACTIONS
                         FOR THE YEAR ENDED DECEMBER 31, 1999

                                                                                      Current Value
                                                                                      Of Asset On
                                    Purchase         Selling          Cost of         Transaction        Net Gain
Description of Asset                  Price           Price            Asset             Date              (Loss)
--------------------                  -----           -----            -----             ----              ------
<S>                                 <C>              <C>              <C>             <C>                <C>
INDIVIDUAL TRANSACTIONS

None

SERIES OF TRANSACTIONS

Purchase:

      Company Stock

      64,945 shares of
      Ionics, Incorporated
      Common Stock                  $1,984,897

      Fidelity Investments
      23,721 shares of

      Contrafund                    $   400,515

Sale:

      Company Stock
       8,540 shares of

      Ionics, Incorporated

      Common Stock                                  $265,968         $236,746              $265,968     $ 29,222

      Fidelity Investments
      13,770 shares of

      Contrafund                                    $843,880         $605,335              $843,880     $238,545



</TABLE>


The  accompanying   notes  are  an  integral  part  of  these
supplemental schedules.

                                                       -13-


<PAGE>







                             SIGNATURES

      Ionics Section 401(k) Stock Savings Plan.  Pursuant to the requirements of
the  Securities  Exchange  Act of 1934,  the  trustees  (or  other  persons  who
administer the employee  benefit plan) have duly caused this annual report to be
signed on its behalf by the undersigned hereunto duly authorized.

                                        IONICS SECTION 401(K) STOCK
                                        STOCK SAVINGS PLAN



Date: June 27, 2000                     By /s/John P. Bergeron
                                          --------------------
                                            John P. Bergeron
                                            Administrator and Vice President




                                  -14-


<PAGE>

                               EXHIBIT 1




                    CONSENT OF INDEPENDENT ACCOUNTANTS

         We  consent  to the  incorporation  by  reference  in the  registration
statement  of  the  Ionics  Section  401(k)  Stock  Savings  Plan  on  Form  S-8
(Registration  No.  33-2092) of our report  dated June 13, 2000 on our audits of
the financial  statements of the Ionics  Section 401(k) Stock Savings Plan as of
December 31, 1999 and 1998,  which  report is included in this Annual  Report on
Form 11-K of the Plan which is being filed as Exhibit 13(b) to the Annual Report
on Form 10-K of Ionics, Incorporated for the year ended December 31, 1999.

                                           /s/BELANGER & COMPANY P.C.
                                           CERTIFIED PUBLIC ACCOUNTANTS

Chelmsford, Massachusetts
June 23, 2000


                                   -15-



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