IONICS INC
DEF 14A, 2000-03-29
SPECIAL INDUSTRY MACHINERY, NEC
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<PAGE>   1

                            SCHEDULE 14A INFORMATION

          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                  EXCHANGE ACT OF 1934 (AMENDMENT NO.       )

FILED BY THE REGISTRANT [X]       FILED BY A PARTY OTHER THAN THE REGISTRANT [ ]

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

Check the appropriate box:
[ ] Preliminary Proxy Statement
[X] Definitive Proxy Statement
[ ] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
[ ] Confidential, for Use of the Commission Only (as permitted by Rule
14a-6(e)(2))

                              Ionics, Incorporated
                (Name of Registrant as Specified In Its Charter)

                   (Name of Person(s) Filing Proxy Statement)

PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):
[X] No fee required.
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

   1) Title of each class of securities to which transaction applies:

   2) Aggregate number of securities to which transaction applies:

   3) Per unit price or other underlying value of transaction computed pursuant
      to Exchange Act
      Rule 0-11 (Set forth the amount on which the filing fee is calculated and
      state how it was determined):

   4) Proposed maximum aggregate value of transaction:

   5) Total fee paid:

[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

   1) Amount Previously Paid:

   2) Form, Schedule or Registration Statement No.:

   3) Filing Party:

   4) Date Filed:

- --------------------------------------------------------------------------------
<PAGE>   2

                                 [IONICS LOGO]

Ionics, Incorporated
65 Grove Street
Watertown, Massachusetts 02472-2882

Arthur L. Goldstein
Chairman and Chief Executive Officer

                                                                  March 30, 2000

Dear Stockholder:

     You are cordially invited to attend our 2000 Annual Meeting of
Stockholders. The meeting is scheduled for 2:00 P.M. on Tuesday, May 2, 2000,
and will be held in the auditorium of the FleetBoston Financial building, 100
Federal Street, Boston, MA 02110.

     The notice of meeting and proxy statement that follow describe the business
to be conducted at the meeting.

     As is our custom, we will give a presentation on the highlights for the
year 1999 as well as the current status of our business. I sincerely hope that
you will be able to attend this meeting and that you will have the opportunity
to meet members of our management team.

     Please sign and return your proxy promptly, whether or not you plan to
attend. Your vote is very important to the Company.

     On behalf of the Directors and Officers, I wish to thank you for your
interest in the Company.
                                            Sincerely,

                                            /s/ Arthur L. Goldstein
                                            ARTHUR L. GOLDSTEIN
                                            Chairman and Chief Executive Officer

                             YOUR VOTE IS IMPORTANT
             Please sign, date and return your proxy card promptly
<PAGE>   3

                                 [IONICS LOGO]

                              IONICS, INCORPORATED

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

                                  MAY 2, 2000

To the Stockholders of
  Ionics, Incorporated:

     Notice is hereby given that the Annual Meeting of Stockholders of Ionics,
Incorporated (the "Corporation" or the "Company") will be held in the auditorium
of the FleetBoston Financial building, 100 Federal Street, Boston,
Massachusetts, on Tuesday, May 2, 2000 at 2:00 P.M. for the following purposes:

        1.  To elect four Class II Directors of the Company, each to serve for a
            three-year term or until a successor is elected or qualified.

        2.  To ratify the selection of PricewaterhouseCoopers LLP as independent
            auditors for the fiscal year ending December 31, 2000.

        3.  To consider and act upon such other matters as may properly come
            before the meeting.

     The Board of Directors has fixed the close of business on March 17, 2000 as
the record date for determination of the stockholders entitled to notice of and
to vote at the meeting. Any stockholder attending the meeting may vote in person
even if such stockholder has returned a proxy.

                                            By Order of the Board of Directors

                                            STEPHEN KORN, CLERK
                                            Ionics, Incorporated
                                            65 Grove Street
                                            Watertown, Massachusetts 02472-2882
March 30, 2000

     WHETHER OR NOT YOU EXPECT TO BE AT THE MEETING, PLEASE MARK, SIGN, DATE AND
RETURN YOUR PROXY IN THE ENVELOPE ENCLOSED HEREWITH.
<PAGE>   4

                              IONICS, INCORPORATED

                                65 GROVE STREET
                      WATERTOWN, MASSACHUSETTS 02472-2882

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

                                PROXY STATEMENT
                            ------------------------

                                 MARCH 30, 2000

     The Notice of the 2000 Annual Meeting of Stockholders of Ionics,
Incorporated (the "Company") is set forth on the preceding page and there is
enclosed with this Proxy Statement a form of Proxy solicited by the Board of
Directors of the Company. This Proxy Statement is furnished in connection with
the solicitation of Proxies by the Board of Directors of the Company for use at
the Annual Meeting of Stockholders to be held on Tuesday, May 2, 2000 (the
"Annual Meeting") at 2:00 P.M., local time, in the auditorium of the FleetBoston
Financial building, 100 Federal Street, Boston, Massachusetts, and any
adjournments thereof. The cost of this solicitation will be borne by the
Company. In addition to solicitation by mail, certain of the officers and
employees of the Company also may solicit Proxies personally or by telephone or
telegram. This Proxy Statement is being first sent to stockholders on or about
March 30, 2000. A copy of the Annual Report to Stockholders for the fiscal year
ended December 31, 1999 (including audited financial statements of the Company)
also accompanies this Proxy Statement.

     Only stockholders of record as of the close of business on March 17, 2000
(the "Record Date") are entitled to notice of and to vote at the Annual Meeting
and/or any adjournments thereof. The outstanding stock of the Company on the
Record Date entitled to vote consisted of 16,228,620 shares of common stock,
$1.00 per share par value (the "Common Stock"). The holders of the outstanding
shares of Common Stock are entitled to one vote per share. Stockholders may vote
in person or by proxy. Execution of a Proxy will not affect a stockholder's
right to attend the meeting and vote in person. All shares represented by valid
Proxies received by the Clerk of the Company prior to the meeting will be voted
as specified in the Proxy; if no specification is made and if discretionary
authority is conferred by the stockholder, the shares will be voted FOR the
election of each of the Board's nominees to the Board of Directors in proposal
1; and FOR the ratification of the selection of an auditor in proposal 2. A
stockholder giving a Proxy has the power to revoke it at any time prior to its
exercise by delivering to the Clerk of the Company a written revocation or a
duly executed Proxy bearing a later date, or by attending the meeting and voting
such shares in person.

     Votes cast by proxy or in person at the Annual Meeting will be tabulated by
the election inspectors appointed for the meeting and will determine whether or
not a quorum is present. The election inspectors will treat abstentions and
broker "non-votes" as shares that are present and entitled to vote for purposes
of determining the presence of a quorum. Abstentions, but not "non-votes," are
counted for purposes of determining the number of shares voting on a particular
matter submitted to the stockholders for a vote. Neither abstentions nor
"non-votes" are treated as having been voted for purposes of determining the
approval of any such matter. A "non-vote" occurs when a nominee holding shares
for a beneficial owner votes on one proposal, but does not vote on another
proposal because, in respect of such other proposal, the nominee does not have
discretionary voting power and has not received instructions from the beneficial
owner. Broker "non-votes" are not considered voted for the particular matter and
have the practical effect of reducing the number of affirmative votes required
to achieve a majority for such matter by reducing the total number of shares
from which the majority is calculated.

                                        1
<PAGE>   5

         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The following table lists as of December 31, 1999, the number of shares of
the Company's Common Stock beneficially owned by stockholders known by the
Company to own more than five percent of such Common Stock outstanding at such
date:

<TABLE>
<CAPTION>
                NAME AND ADDRESS OF                  AMOUNT AND NATURE OF      PERCENT OF
                 BENEFICIAL OWNER                    BENEFICIAL OWNERSHIP        CLASS
                -------------------                  --------------------      ----------
<S>                                                  <C>                       <C>
Wellington Management Company LLP                        2,046,500(1)             12.6%
     75 State Street
     Boston, MA 02109
Capital Research and Management Company                  1,461,900(2)              9.0%
     333 South Hope Street
     Los Angeles, CA 90071
Hartford Capital Appreciation HLS Fund, Inc.               934,900(3)              5.8%
     200 Hopmeadow Street
     Simsbury, CT 06089
</TABLE>

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

(1) Includes shared voting power as to 1,903,400 shares and shared dispositive
    power as to all 2,046,500 shares. Wellington Management Company LLP has no
    sole voting power or sole dispositive power as to any of these shares.

(2) Includes sole dispositive power as to all 1,461,900 shares. Capital Research
    and Management Company has no voting power and no shared dispositive power
    as to any of these shares.

(3) Includes shared voting power and shared dispositive power as to all 934,900
    shares. Hartford Capital Appreciation HLS Fund, Inc. has no sole voting
    power or sole dispositive power as to any of these shares.

     The following table sets forth as of the Record Date the number of shares
of Common Stock of the Company beneficially owned by each of the directors
(including nominees), each of the current executive officers named in the
Summary Compensation Table on page 9 of this Proxy Statement, and all directors
(including nominees) and executive officers of the Company as a group (17
persons). Unless otherwise indicated, the named person possesses sole voting and
dispositive power with respect to the shares.

<TABLE>
<CAPTION>
                                                              AMOUNT AND NATURE OF        PERCENT OF
                 NAME OF BENEFICIAL OWNER                    BENEFICIAL OWNERSHIP(#)       CLASS(#)
                 ------------------------                    -----------------------      ----------
<S>                                                          <C>                          <C>
Douglas R. Brown...........................................            18,161(1)               *
William L. Brown...........................................            18,499(2)               *
Arnaud de Vitry d'Avaucourt................................            33,500(3)               *
Kathleen F. Feldstein......................................             5,160(4)               *
Arthur L. Goldstein........................................           667,481(5)+            4.0%
William E. Katz............................................           259,204(6)+            1.6%
Carl S. Sloane.............................................            10,000(7)               *
John J. Shields............................................            11,960(8)               *
Daniel I.C. Wang...........................................             6,660(9)               *
Mark S. Wrighton...........................................            11,760(10)              *
Allen S. Wyett.............................................            17,000(11)              *
Robert J. Halliday.........................................           106,418(12)+             *
Edward J. Cichon...........................................             6,000(13)              *
</TABLE>

                                        2
<PAGE>   6

<TABLE>
<CAPTION>
                                                              AMOUNT AND NATURE OF        PERCENT OF
                 NAME OF BENEFICIAL OWNER                    BENEFICIAL OWNERSHIP(#)       CLASS(#)
                 ------------------------                    -----------------------      ----------
<S>                                                          <C>                          <C>
Theodore G. Papastavros....................................           162,447(14)+             *
All directors and executive officers as a group (17
  persons).................................................         1,444,408(15)            8.4%
</TABLE>

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

  # The number of shares of Common Stock deemed outstanding as of the Record
    Date for each individual includes shares of Common Stock outstanding on such
    date owned by such individual and all shares of Common Stock subject to
    stock options held by such individual exercisable as of the Record Date or
    within 60 days after the Record Date.

  *  Less than 1%

  +  If certain of the options owned by these executive officers are exercised,
     certain of the shares would be subject to repurchase in varying amounts if
     the individual's employment with the Company were to be terminated before
     specified dates.

 (1) Includes 8,000 shares which Mr. Douglas R. Brown has the right to acquire
     pursuant to the exercise of stock options.

 (2) Includes 15,000 shares which Mr. William L. Brown has the right to acquire
     pursuant to the exercise of stock options.

 (3) Includes 11,500 shares which Mr. de Vitry d'Avaucourt has the right to
     acquire pursuant to the exercise of stock options. Another 12,000 shares,
     as to which Mr. de Vitry d'Avaucourt shares dispositive power, are held by
     a financial institution in a fiduciary capacity for the benefit of Mr. de
     Vitry d'Avaucourt's wife. Such number excludes 341,926 shares held in a
     trust of which Mr. de Vitry d'Avaucourt's wife is the principal beneficial
     owner, and also excludes an additional 524,000 shares held in a separate
     trust, of which Mr. de Vitry d'Avaucourt is the principal indirect
     beneficiary. Mr. de Vitry d'Avaucourt disclaims beneficial ownership of
     such 865,926 shares.

 (4) Includes 4,000 shares which Ms. Feldstein has the right to acquire pursuant
     to the exercise of stock options.

 (5) Includes 430,000 shares which Mr. Goldstein has the right to acquire
     pursuant to the exercise of stock options. Includes beneficial ownership of
     4,926 shares held in the Ionics Section 401(k) Plan for the account of Mr.
     Goldstein. Does not include 6,800 shares held by members of Mr. Goldstein's
     immediate family, as to which Mr. Goldstein disclaims beneficial ownership.

 (6) Includes 155,000 shares which Mr. Katz has the right to acquire pursuant to
     the exercise of stock options. Does not include 4,740 shares held by
     members of Mr. Katz's immediate family, as to which Mr. Katz disclaims
     beneficial ownership.

 (7) Includes 9,000 shares which Mr. Sloane has the right to acquire pursuant to
     the exercise of stock options.

 (8) Includes 11,500 shares which Mr. Shields has the right to acquire pursuant
     to the exercise of stock options.

 (9) Includes 6,000 shares which Mr. Wang has the right to acquire pursuant to
     the exercise of stock options.

(10) Includes 11,000 shares which Mr. Wrighton has the right to acquire pursuant
     to the exercise of stock options.

(11) Includes 15,000 shares which Mr. Wyett has the right to acquire pursuant to
     the exercise of stock options. Does not include 1,000 shares held by a
     member of Mr. Wyett's immediate family, as to which Mr. Wyett disclaims
     beneficial ownership.

                                        3
<PAGE>   7

(12) Includes 86,000 shares which Mr. Halliday has the right to acquire pursuant
     to the exercise of stock options. Includes beneficial ownership of 1,258
     shares in the Ionics Section 401(k) Plan for the account of Mr. Halliday.

(13) Represents shares which Mr. Cichon has the right to acquire pursuant to the
     exercise of stock options.

(14) Includes 102,000 shares which Mr. Papastavros has the right to acquire
     pursuant to the exercise of stock options. Includes beneficial ownership of
     2,487 shares in the Ionics Section 401(k) Plan for the account of Mr.
     Papastavros.

(15) Assumes exercise of options held by the group for all 975,900 shares and
     that such shares are outstanding.

     The information provided in the above footnotes concerning beneficial
ownership in the Ionics Section 401(k) Plan is derived from a Plan statement as
of January 31, 2000.

                     EXPLANATION OF AGENDA FOR THE MEETING

PROPOSAL 1.  ELECTION OF DIRECTORS.

     The Company has a Board of Directors currently consisting of four Class I
Directors, four Class II Directors and three Class III Directors. The Class I,
Class II and Class III Directors currently in office will serve until the annual
meeting of stockholders to be held in 2002, 2000 and 2001, respectively, and
until their respective successors are duly elected and qualified (or until the
director's earlier resignation or removal). At each annual meeting of
stockholders, directors are elected for a full term of three years to succeed
those whose terms are expiring.

     It is the intention of the persons authorized by the enclosed Proxy, which
is solicited by the Board of Directors, to nominate and elect the four persons
named in the table below as Class II Directors, all of whom presently serve as
Class II Directors. To be elected, each nominee must receive the affirmative
vote of a plurality of the issued and outstanding shares of the Common Stock
represented in person or by Proxy at the Annual Meeting and entitled to vote.
THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" ALL THE NOMINEES
LISTED BELOW. The following table shows, for each nominee, his or her principal
occupation since January 1, 1995 and present positions with the Company, period
of past service as a Director, age on March 1, 2000, and directorships of other
public companies (i.e., companies subject to the reporting requirements of the
Securities Exchange Act of 1934 or registered as investment companies under the
Investment Company Act of 1940):

                                        4
<PAGE>   8

<TABLE>
<CAPTION>
                                          PRINCIPAL OCCUPATION
                                        (SINCE JANUARY 1, 1995),
                                         PRESENT POSITIONS WITH                        PERIOD
                                              THE COMPANY                             OF PAST
                                           AND DIRECTORSHIPS                        SERVICE AS A
        NAME AND AGE                   OF OTHER PUBLIC COMPANIES                      DIRECTOR
        ------------                   -------------------------                    ------------
<S>                             <C>                                         <C>
                       Directors whose Terms Expire in 2000 (Class II Directors)

Arnaud de Vitry d'Avaucourt     Engineering consultant                               since 1964
(73)*

William E. Katz                 Executive Vice President of the Company              since 1961
(75)                            since prior to 1995

Daniel I.C. Wang                Institute Professor, Massachusetts                 since May 1997
(64)*                           Institute of Technology

Mark S. Wrighton                Chancellor, Washington University St.                since 1993
(50)#                           Louis, Missouri (since July 1995);
                                previously Provost and Professor of
                                Chemistry, Massachusetts Institute of
                                Technology; Director, Helix Technology
                                Corporation (cryogenic and vacuum
                                technology products), Cabot Corporation
                                (specialty chemicals manufacturing and
                                energy products), and OIS Optical
                                Imaging Systems, Inc. (currently
                                inactive)
</TABLE>

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

*  Member of Audit Committee

#  Member of Compensation Committee

                                        5
<PAGE>   9

     The following table contains similar information about the Class I and
Class III Directors of the Company, whose terms of office do not expire at the
2000 Annual Meeting and who consequently are not nominees for election in 2000:

<TABLE>
<CAPTION>
                                              PRINCIPAL OCCUPATION
                                            (SINCE JANUARY 1, 1995),
                                             PRESENT POSITIONS WITH                      PERIOD
                                                  THE COMPANY                           OF PAST
                                               AND DIRECTORSHIPS                      SERVICE AS A
           NAME AND AGE                    OF OTHER PUBLIC COMPANIES                    DIRECTOR
           ------------                    -------------------------                  ------------
<S>                                   <C>                                     <C>
                         Directors whose Terms Expire in 2002 (Class I Directors)

Douglas R. Brown                      President and Chief Executive                  since May 1996
(45)*                                 Officer, Advent International Corp.
                                      (registered investment advisor)
                                      (since January 1, 1996); Chief
                                      Investment Officer, Advent
                                      International Corp. (1995); Chief
                                      Executive Officer, Advent
                                      International plc (1990-1994);
                                      Director, Advent International Corp.
                                      and Aspen Technology Corp. (computer
                                      software)

Kathleen F. Feldstein                 President, Economic Studies, Inc.           since November 1997
(59)*                                 (economic consulting firm) since
                                      1987; Director, Bank America Corp.,
                                      BellSouth Corporation
                                      (telecommunications services,
                                      systems and products), John Hancock
                                      Financial Services Inc. and
                                      Knight-Ridder, Inc. (newspaper
                                      publishing)

Arthur L. Goldstein                   President and Chief Executive                    since 1971
(64)+                                 Officer of the Company (since prior
                                      to 1995); Chairman of the Board of
                                      the Company since May 1990;
                                      Director, Cabot Corporation
                                      (specialty chemicals manufacturing
                                      and energy products), State Street
                                      Corporation (bank holding company)
                                      and State Street Bank and Trust
                                      Company

Carl S. Sloane                        Professor of Business                       since February 1995
(63)+#                                Administration, Harvard Graduate
                                      School of Business Administration
                                      (since 1991); Director, Sapient
                                      Corporation (information technology
                                      applications and solutions); The
                                      Pittston Company (diversified
                                      products and services ); and
                                      Rayonier, Inc. (specialty pulps,
                                      timber and wood products)
</TABLE>

- ---------------
*  Member of Audit Committee

#  Member of Compensation Committee

+  Member of Executive Committee

                                        6
<PAGE>   10

<TABLE>
<CAPTION>
                                              PRINCIPAL OCCUPATION
                                            (SINCE JANUARY 1, 1995),
                                             PRESENT POSITIONS WITH                      PERIOD
                                                  THE COMPANY                           OF PAST
                                               AND DIRECTORSHIPS                      SERVICE AS A
           NAME AND AGE                    OF OTHER PUBLIC COMPANIES                    DIRECTOR
           ------------                    -------------------------                  ------------
<S>                                   <C>                                     <C>
                        Directors whose Terms Expire in 2001 (Class III Directors)

William L. Brown                      Retired Chairman of the Board, The               since 1991
(78)*                                 First National Bank of Boston;
                                      Director, G.C. Companies, Inc.
                                      (motion picture distribution);
                                      Trustee, Bradley Real Estate Trust

John J. Shields                       General Partner, Boston Capital                  since 1988
(61)#+                                Ventures (venture capital) since
                                      January 2, 1998; President and Chief
                                      Executive Officer, King's Point
                                      Holdings Incorporated (diversified
                                      business information, technology
                                      instrumentation and cranberry
                                      cultivation) April 1993 - December
                                      1997; Director, Centennial
                                      Technologies, Inc. (manufacturer and
                                      marketer of PC cards for
                                      microelectronics applications).

Allen S. Wyett                        President, Wyett Consulting Group,               since 1992
(66)#                                 Inc.
</TABLE>

- ---------------
*  Member of Audit Committee

#  Member of Compensation Committee

+  Member of Executive Committee

     In addition to the Executive Committee of the Board of Directors, which
held one telephonic meeting during the year, the Company has an Audit Committee,
of which Mr. Douglas Brown is Chairman, and a Compensation Committee, of which
Mr. Wyett is Chairman. There is no nominating committee of the Board. The Audit
Committee meets with management and with the Company's independent auditors
twice a year to review financial results and procedures, internal financial
controls, audit plans and recommendations. The Compensation Committee reviews
and establishes the remuneration to be paid to certain of the executive officers
of the Company, reviews the remuneration to be paid other officers, and acts as
the administrator of the Company's stock option and restricted stock plans.

     During 1999, the Board of Directors held four meetings. The Audit Committee
met twice and the Compensation Committee met twice. Except for Mr. Douglas
Brown, each director attended 75% or more of the aggregate of (i) the total
number of meetings of the Board and (ii) the total number of meetings held by
all committees of the Board on which such director served.

     If, at the time of the Annual Meeting, any of the above-named nominees is
unable to serve, a circumstance which is not anticipated, and if the enclosed
Proxy confers discretionary authority, the persons named in the Proxy will
either vote for such substitute nominee(s) as may be designated by the Board of
Directors or will vote for a reduction in the number of directors, as determined
by the Board.

                                        7
<PAGE>   11

PROPOSAL 2.  SELECTION OF AN AUDITOR

     The Board of Directors proposes that the firm of PricewaterhouseCoopers
LLP, independent certified public accountants, be appointed to serve as auditors
for the fiscal year ending December 31, 2000. The ratification of this selection
is not required under the laws of Massachusetts, where the Company is
incorporated, but the Board of Directors of the Company believes it is sound
policy and in the best interests of the stockholders to do so. In the event a
majority of the votes cast are against the selection of PricewaterhouseCoopers
LLP, the Board will consider the vote and the reasons therefor in future
recommendations on the selection of an auditor for the Company.

     A representative of PricewaterhouseCoopers LLP is expected to be present at
the Annual Meeting with the opportunity to make a statement if desired, and is
expected to be available to respond to appropriate questions from stockholders
who are present at the meeting.

     THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT YOU VOTE FOR THE
RATIFICATION OF THIS SELECTION.

                                        8
<PAGE>   12

                  EXECUTIVE COMPENSATION AND OTHER INFORMATION

SUMMARY OF CASH AND CERTAIN OTHER COMPENSATION

     The following table provides summary information concerning the annual and
long-term compensation paid to or earned by the Company's Chief Executive
Officer and each of the four other most highly compensated executive officers of
the Company during the fiscal years ended December 31, 1999, 1998 and 1997 (the
"Named Executive Officers"):

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                             LONG-TERM COMPENSATION
                                                                     AWARDS
                                                            -------------------------
                                                            RESTRICTED    SECURITIES       ALL OTHER
                                     ANNUAL COMPENSATION      STOCK       UNDERLYING    COMPENSATION(2)
          NAME AND                   --------------------     AWARDS     OPTIONS/SARS   ---------------
     PRINCIPAL POSITION       YEAR   SALARY($)   BONUS($)      ($)          (#)(1)            ($)
     ------------------       ----   ---------   --------   ----------   ------------         ---
<S>                           <C>    <C>         <C>        <C>          <C>            <C>
Arthur L. Goldstein.........  1999    550,000     40,000        0                0          53,283
  Chairman of the Board,      1998    529,600     50,000        0          150,000          53,104
  President and Chief         1997    509,600    120,000        0                0          43,881
  Executive Officer

William E. Katz.............  1999    253,500     25,000        0                0           8,426
  Executive Vice President    1998    244,100     30,000        0           50,000           8,814
                              1997    234,100     60,000        0                0           7,624

Robert J. Halliday..........  1999    197,000     35,000        0                0           3,915
  Vice President, Finance     1998    186,600     40,000        0           50,000           3,774
  and Chief Financial         1997    176,600     60,000        0                0           2,951
  Officer

Theodore G. Papastavros.....  1999    197,000     30,000        0                0           9,374
  Vice President,             1998    186,600     30,000        0           50,000           8,585
  Strategic Planning          1997    176,600     60,000        0                0           6,705

Edward J. Cichon............  1999    197,000     30,000        0                0               0
  Vice President,             1998     81,338(3)  15,000        0           30,000               0
  Equipment Business Group    1997      -           -         -              -              -
</TABLE>

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

(1) Options granted in 1998 were granted under the Company's 1997 Stock
    Incentive Plan ("1997 Plan"). Each option is exercisable for one share of
    Common Stock, which may be purchased upon exercise with either cash or
    Common Stock. The options granted under the 1997 Plan have a duration of ten
    years, and are exercisable in 20% installments commencing on the first
    anniversary of the date of grant. Options may not be transferred by an
    option holder (other than by will or by the laws of descent and distribution
    or pursuant to a valid domestic relations order), and may be exercised only
    while the holder is an employee or within 90 days after termination of
    employment.

(2) Comprised of (a) Company matching contributions to officer's account in
    Ionics Section 401(k) Plan, available to all employees after an eligibility
    period, and (b) amounts accrued under the Company's Supplemental Executive
    Retirement Plan, described below following the Pension Plan Table. Matching
    401(k) Plan contributions in 1999 for the Named Executive Officers in their
    order of presentation were $4,800, $0, $2,500, $4,800 and $0, respectively.
    Amounts accrued under the Supplemental Executive Retirement Plan for the
    Named Executive Officers in 1999 were $48,483, $8,426, $1,415, $4,574 and
    $0, respectively. Employees may elect to contribute to the Ionics Section
    401(k) Plan from 1% to 12% of the amount that they would otherwise receive
    as cash compensation, and the contributed amounts, subject to

                                        9
<PAGE>   13

    certain limitations, are not subject to current federal income taxes.
    Amounts contributed to the Plan are invested at the direction of the
    employee in shares of the Company's Common Stock or in shares of one or more
    of seven mutual funds. The Company contributes to the Plan, for the
    individual accounts of the participants in the Plan, an amount equal to 50%
    of the amount each participant has elected to invest, up to 6% of
    compensation, in Common Stock of the Company. Matching amounts are invested
    entirely in the Company's Common Stock. The contributions by the Company for
    any one calendar year cannot exceed an aggregate maximum amount fixed from
    time to time by the Board of Directors.

(3) Mr. Cichon commenced employment with the Company on July 27, 1998.

STOCK OPTION GRANTS

     No stock option grants were made to the Named Executive Officers in 1999.
No stock appreciation rights ("SARs") were granted during fiscal 1999.

STOCK OPTION EXERCISES

     The following table provides information, with respect to the Named
Executive Officers listed in the Summary Compensation Table, concerning the
exercise of options during, and holdings of unexercised options at the end of,
fiscal year 1999.

                   AGGREGATED OPTION EXERCISES IN FISCAL 1999
                      AND FISCAL YEAR-END OPTION VALUES(1)

<TABLE>
<CAPTION>
                                            (I)           (II)           (III)               (IV)
                                                                       NUMBER OF
                                                                      SECURITIES
                                                                      UNDERLYING     VALUE OF UNEXERCISED
                                          SHARES                      UNEXERCISED        IN-THE-MONEY
                                        ACQUIRED ON       VALUE         OPTIONS           OPTIONS AT
                                         EXERCISE      REALIZED(2)     AT FISCAL      FISCAL YEAR-END(2)
                 NAME                       (#)            ($)         YEAR-END              ($)
                 ----                   -----------    -----------    -----------    --------------------
<S>                                     <C>            <C>            <C>            <C>
Arthur L. Goldstein...................    24,000         382,500        550,000           1,550,000
William E. Katz.......................     -               -            195,000             690,000
Theodore G. Papastavros...............     9,500         140,125        142,000             323,250
Robert J. Halliday....................    11,000          79,161        126,000             199,750
Edward J. Cichon......................     -               -             30,000                   0
</TABLE>

- ---------------
(1) Outstanding options were granted under the Company's 1997 Stock Incentive
    Plan ("1997 Plan"), described in Note 1 to the Summary Compensation Table on
    page 9, or under the Company's 1979 Stock Option Plan ("1979 Plan"). All
    options exercised by Named Executive Officers in 1999 were issued under the
    1979 Plan. Each option granted under the 1979 Plan is exercisable for one
    share of Common Stock, which may be purchased upon exercise with either cash
    or Common Stock. Options granted under the 1979 Plan have a duration of ten
    years and one day, and are immediately exercisable, subject to the Company's
    right to repurchase, during the first five years from the date of grant, a
    decreasing proportion of any shares purchased upon exercise in the event the
    employee leaves the Company or desires to sell the shares. Such repurchase
    rights terminate in the event another entity, person or group acquires 30%
    or more of the outstanding voting shares of the Company. Options granted
    under the 1979 Plan may not be transferred by an option holder (other than
    by the laws of descent or distribution), and may be exercised only while the
    holder is an employee of the Company or of a subsidiary, or within 30 days
    after termination of employment, or by the holder's estate for a period of
    90 days after his death.

                                       10
<PAGE>   14

(2) Calculated as the difference between the closing price of the Company's
    Common Stock, as reported on the date of option exercise (or the sales price
    on such date if the individual sold on the exercise date) and the exercise
    price of the option(s) (Column II), and as the difference between the
    closing price of the Company's Common Stock, as reported on December 31,
    1999 ($28 1/8 per share), and the exercise price of the option(s)(Column
    IV).

PENSION PLAN

     Employees of the Company and its domestic divisions and subsidiaries
(except for employees of the Fabricated Products Group, based in Bridgeville,
Pennsylvania, who participate in a defined contribution pension plan) may at
their election participate in the Company's defined benefit retirement plan (the
"Retirement Plan") after attaining age 21 and completing one year of service. No
benefits vest under the Retirement Plan until an employee has five years of
participation, at which time the employee becomes 100% vested. An employee must
contribute at least 1% of base salary in order to accrue benefits under the
Retirement Plan. The benefits payable upon retirement vary with the years of
service and level of compensation while participating in the Retirement Plan.
Upon retirement, participants also receive the total of their own contributions
to the Retirement Plan plus the earnings thereon. The following table shows the
estimated annual Company-provided pension benefits payable to an executive
officer or other participant at normal retirement age (age 65) in the Retirement
Plan:

                               PENSION PLAN TABLE
                           (ESTIMATED ANNUAL BENEFITS
                             FOR YEARS OF CREDITED
                               SERVICE INDICATED)

<TABLE>
<CAPTION>
  BASE SALARY AT
RETIREMENT DATE(1)                     5        10        15        20        25        30        35        40
- ------------------                     -        --        --        --        --        --        --        --
<C>                  <S>             <C>      <C>       <C>       <C>       <C>       <C>       <C>       <C>
     $ 50,000        ..............  $2,841   $ 5,067   $ 6,933   $ 8,700   $10,467   $12,234   $14,001   $15,768
       75,000        ..............   4,262     7,601    10,474    13,248    16,022    18,797    21,571    24,345
      100,000        ..............   5,682    10,135    14,015    17,796    21,578    25,359    29,140    32,922
      125,000        ..............   7,103    12,668    17,556    22,344    27,133    31,922    36,710    41,499
      150,000        ..............   8,524    15,202    21,097    26,893    32,688    38,484    44,280    50,075
      175,000        ..............   9,659    17,450    24,352    31,155    37,958    44,761    51,564    58,367
      200,000        ..............   9,750    18,571    26,480    34,290    42,100    49,910    57,720    65,531
      225,000        ..............   9,750    19,439    28,355    37,173    45,990    54,807    63,625    72,442
      250,000        ..............   9,750    20,307    30,231    40,055    49,880    59,704    69,529    79,353
      275,000        ..............   9,750    21,176    32,106    42,938    53,770    64,601    75,433    86,265
      300,000        ..............   9,750    22,044    33,982    45,821    57,660    69,498    81,337    93,176
      325,000        ..............   9,750    22,798    35,150    47,402    59,655    71,907    84,160    96,412
      350,000        ..............   9,750    22,827    35,178    47,431    59,683    71,936    84,188    96,441
      375,000        ..............   9,750    22,827    35,178    47,431    59,683    71,936    84,188    96,441
      400,000        ..............   9,750    22,827    35,178    47,431    59,683    71,936    84,188    96,441
</TABLE>

- ---------------
(1) Effective January 1, 2000, under Internal Revenue Code Section 401(a)(17),
    no more than $170,000 of cash compensation may be taken into account in
    calculating benefits under the Retirement Plan (adjusted from $160,000).

     Under the terms of the Retirement Plan, only the amount shown as "Salary"
in the Summary Compensation Table is covered under "Base Salary" above. The
fixed monthly retirement benefit of an officer retiring at normal retirement age
(assuming payment is made on a life annuity basis) is determined by the

                                       11
<PAGE>   15

following formula: (i) for years prior to January 1, 1989 -- one half of one
percent (0.5%) of the first $550 of base monthly salary as of January 1, 1990,
plus one and one-quarter percent (1.25%) of the balance of base monthly salary
as of that date, that sum being multiplied by the number of prior years of
service; plus (ii) for calendar year 1989, one and one-quarter percent (1.25%)
of base monthly salary as of January 1, 1990; plus (iii) for each year after
December 31, 1989 -- one and one-quarter percent (1.25%) of base monthly salary
as of January 1st of that year. Fixed retirement benefits are not subject to
deduction for Social Security benefits or other benefits received by officers.

     The Named Executive Officers have been credited with the following years of
service, and would receive the following estimated annual benefits at normal
retirement age (65): Mr. Goldstein, 39.6 years, $85,895; Mr. Katz, 50.4 years,
$53,600; Mr. Halliday, 9.1 years, $53,658; and Mr. Papastavros, 43.2 years,
$61,638. Mr. Cichon has not yet been credited with any years of service under
the Retirement Plan.

     In 1996, the Company's Board of Directors adopted a Supplemental Executive
Retirement Plan for officers and key employees of the Company ("SERP"). The
purpose of the SERP is to permit officers and other key employees whose Base
Salary exceeds the maximum pay upon which retirement benefits may be accrued in
any year to accrue retirement benefits on Base Salary in excess of that amount,
equivalent to the benefits that would have been accrued under the Retirement
Plan if Base Salary levels over that amount could be taken into account in
calculating benefits under that Plan. The SERP is administered by the
Compensation Committee of the Board of Directors.

STOCK PLANS

     The Company currently has four stock ownership plans: the 1979 Stock Option
Plan; the 1997 Stock Incentive Plan; the 1994 Restricted Stock Plan; and the
1986 Stock Option Plan for Non-Employee Directors. No new stock options will be
granted under the 1979 plan, under which options to purchase 1,546,400 shares
were outstanding as of December 31, 1999.

CHANGE IN CONTROL SEVERANCE AGREEMENTS

     The Company has entered into Employee Retention Agreements (the
"Agreements") with each of the Named Executive Officers and with eight other
officers of the Company or its subsidiaries. The Agreements have an initial term
expiring on December 31, 1999, and are automatically extended on an annual basis
unless the Company provides at least three months' notice that the Agreements
will not be extended. Each Agreement provides for severance benefits if the
employment of the employee is terminated by the Company (other than for Cause,
as defined in the Agreement, or by reason of his death or disability) or by the
employee for Good Reason (as defined in the Agreement) within 24 months after a
Change in Control (as defined in the Agreement). Each Agreement provides that,
in the event of a Potential Change in Control (as defined in the Agreement), the
employee may not voluntarily resign as an employee, subject to certain
conditions, for at least six months after the occurrence of such Potential
Change in Control.

     The Agreements provide for the following severance benefits: (i) a lump-sum
payment equal to 200% (299% in the case of Mr. Goldstein) of the sum of (x) the
employee's average annual base salary in the year of his termination and the
prior two years plus (y) the average of the cash bonuses paid or awarded to him
in respect of the three fiscal years preceding his termination; and (ii) the
continuation of life, disability, dental and group health insurance benefits for
a period of 24 months without charge to the employee. To the extent that
payments to the employee pursuant to the Agreement (together with any other
payments or benefits, such as the accelerated vesting of stock options or
restricted stock awards, received by the employee in connection with a Change in
Control) would result in the triggering of the provisions of Sections 280G and
4999 of the Internal Revenue Code of 1986, as amended (the "Code"), the
Agreement provides that the payments to be

                                       12
<PAGE>   16

made pursuant to the Agreement will be reduced to the largest amount that would
result in no portion of such payments being subject to the excise tax imposed by
Section 4999 of the Code.

     In addition to the foregoing agreements, the Company's stock option and
restricted stock plans provide for immediate lapse of the Company's repurchase
rights or vesting of all outstanding options and awards upon any Change in
Control (as defined in such plans) of the Company.

REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS ON EXECUTIVE
COMPENSATION

     The Board of Directors appoints each year from among its members a
Compensation Committee (the "Committee"). The Committee, which currently
consists of four non-employee directors under Rule 16b-3 of the Securities
Exchange Act of 1934 (the "Exchange Act"), is responsible for reviewing and
establishing the compensation of the executive officers of the Company, and for
authorizing grants under the Company's 1997 Stock Incentive Plan (previously
under the 1979 Stock Option Plan) and 1994 Restricted Stock Plan. The Committee
has furnished this report concerning compensation of executive officers for the
fiscal year ended December 31, 1999.

     The compensation program for executive officers involves consideration of
cash compensation, the granting of options to acquire the Company's Common
Stock, and the granting of restricted stock under the 1994 Restricted Stock
Plan.

     Cash Compensation

     Cash compensation of executive officers is structured to include base
salary and, based on the achievement of performance objectives, a cash bonus.
The Company determines base salary levels of executive officers by comparison to
other companies engaged in its industry, represented by those in the "peer
group" Index set forth in this Proxy Statement, or in similar industries,
subject to an evaluation of comparative overall performance of the companies.

     The policy of the Company is to pay cash bonuses based on the achievement
of specified corporate, business unit and individual performance objectives. The
cash bonuses listed in the Summary Compensation Table earned by executive
officers, as well as by other senior officers, were earned under the Company's
Managerial Bonus Program. The Managerial Bonus Program considers both
quantitative and qualitative performance. Quantitative performance focuses on
two measurements: earnings before interest and taxes (EBIT) achieved by the
business unit(s) for which the executive officer has major responsibility or
involvement, and EBIT return on the average capital employed by such business
unit(s) during the year. Qualitative performance focuses primarily on the degree
to which the officer has participated in and contributed to the achievement of
specified individual, divisional, departmental or corporate non-financial
objectives.

     The Committee, after consideration of management's recommendations, may
elect to utilize restricted stock in lieu of a portion of any cash award that
might be payable under the Managerial Bonus Program. The Committee may also make
discretionary restricted stock awards.

     Budgeted amounts for EBIT and EBIT return on average capital employed are
established for each business unit, and for the Company as a whole, early in
each fiscal year. At the same time, a corresponding cash bonus target is
established for each executive officer based on the budgets of the business
unit(s) for which the officer has major managerial responsibility or
involvement. The cash bonus actually awarded, determined early in the next
fiscal year by the Committee, depends on the extent to which the actual
performance of the business unit(s) for which the officer has responsibility or
involvement meets or exceeds the budgeted amounts, and on the degree of success
in achieving the qualitative objectives.

                                       13
<PAGE>   17

     The Committee may make discretionary bonus awards in appropriate
circumstances in which an executive officer might merit a bonus based on other
considerations.

     The 1999 base salary of Mr. Goldstein, the Company's Chief Executive
Officer, was established by the Committee in May 1999. In considering Mr.
Goldstein's base salary, which was established at $550,000, the Committee
compared it to that paid by peer companies and companies in similar industries.
In doing so, the Committee reviewed on a comparative basis the Company's
financial performance in its industry; improvements in organizational structure;
progress in developing strategic "partnering" relationships; and generally Mr.
Goldstein's leadership in the development of the Company's business.

     Based on the Company's performance in 1999, and in consideration of such
performance in the context of the Company's Managerial Bonus Program discussed
above, the Committee approved bonuses as provided for under the program to Mr.
Goldstein and other executive officers and key employees on February 25, 2000.
Under the terms of the program, Mr. Goldstein was awarded a bonus of $40,000.

     Stock Options

     The Committee believes that stock options are an appropriate mechanism to
provide senior management with a long-term incentive to strive for the continued
growth and success of the Company. The Company's stock option policy,
established by the Committee, is to recognize employee leadership and
significant contribution to the Corporation, regardless of the employee's level.
The Committee also believes that ownership of the Company's stock by management
promotes the enhancement of stockholder value by creating a greater community of
interest between stockholders and management. Grants of stock options are now
made under the 1997 Stock Incentive Plan, approved by the stockholders at the
1997 Annual Meeting. The size of stock option grants made by the Committee is
based on evaluation of a recipient's performance, salary level and number of
options held as a result of prior grants. During the fiscal year ended December
31, 1999, no options were granted to Mr. Goldstein or the other executive
officers of the Corporation, except for a stock option granted to the Company's
Vice President and Corporate Controller upon his commencement of employment.

     Compliance with Internal Revenue Code Section 162(m)

     Section 162(m) of the Internal Revenue Code, enacted in 1993, generally
disallows a tax deduction to a public company for compensation in excess of $1
million paid to the company's chief executive officer and four other most highly
compensated executive officers. Certain types of performance-based compensation,
such as that available under the Company's 1979 Stock Option Plan and the 1997
Stock Incentive Plan, will not be subject to the deduction limit if certain
requirements set forth in Section 162(m) are met.

                                            Respectfully submitted by the
                                            Compensation Committee
                                                 Allen S. Wyett, Chairman
                                                 John J. Shields
                                                 Carl S. Sloane
                                                 Mark S. Wrighton

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     No member of the Compensation Committee is a former or current officer or
employee of the Company or any of its subsidiaries. To the Company's knowledge,
there were no relationships involving members of the Committee or other
directors of the Company requiring disclosure in this Proxy Statement.

                                       14
<PAGE>   18

STOCK PERFORMANCE GRAPH

     The Securities and Exchange Commission (the "Commission") requires that the
Company include in this Proxy Statement a line-graph presentation comparing the
cumulative, five-year return to the Company's stockholders (based on
appreciation of the market price of the Company's Common Stock) on an indexed
basis with (i) a broad equity market index and (ii) an appropriate published
industry or line-of-business index, or peer group index constructed by the
Company. The following presentation compares the Company's Common Stock price in
the five year period from December 31, 1994 to December 31, 1999 to the S&P 500
Stock Index and to a "peer group" index over the same period. The peer group
index consists of the common stock of Calgon Carbon Corporation, Osmonics, Inc.,
and Pall Corporation. The peer group previously included United States Filter
Corporation, which was acquired by Vivendi S.A. in 1999 and is no longer
publicly traded. These corporations are involved in various aspects of the water
treatment or liquids separations businesses. The presentation assumes that the
value of an investment in each of the Company's Common Stock, the S&P 500 Index,
and the peer group index was $100 on December 31, 1994, and that any cash
dividends paid by any constituent company (none have been paid by the Company)
were reinvested in the same security.

             COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN AMONG
    IONICS, INCORPORATED, S&P 500 INDEX AND "PEER GROUP" INDEX OF COMPARABLE
                                   COMPANIES
[IONICS GRAPH]

<TABLE>
<CAPTION>
                                                  IONICS, INCORPORATED               S&P 500                   PEER GROUP
                                                  --------------------               -------                   ----------
<S>                                             <C>                         <C>                         <C>
1994                                                     100.00                      100.00                      100.00
1995                                                     138.65                      137.57                      143.06
1996                                                     152.99                      169.16                      141.58
1997                                                     124.70                      225.62                      117.17
1998                                                      95.42                      290.10                      133.79
1999                                                      89.64                      351.15                      122.92
</TABLE>

DIRECTOR COMPENSATION

     Each director who is not an employee of the Company receives an annual
retainer of $15,000, plus a fee of $2,000 for each regular meeting of the Board
of Directors attended (these fees were increased effective May 5, 1999 from
$10,000 and $1,000, respectively). In addition, each non-employee Director who
is a

                                       15
<PAGE>   19

member of a Committee also receives a fee of $1,000 for each meeting of the
Committee attended (increased from $500, effective May 5, 1999).

     On August 19, 1998, the Board of Directors adopted the 1998 Non-Employee
Directors' Fee Plan ("Fee Plan"). The Fee Plan permits non-employee directors to
elect to receive payment of the annual retainer fee in cash or in Common Stock.
The valuation of the Common Stock is based on the last reported sales price of
the Common Stock on the New York Stock Exchange on the trading date next
preceding the date of the Board meeting at which payment will be made. Annual
retainer fees are paid in two equal annual installments.

     Under the Company's 1986 Stock Option Plan for Non-Employee Directors (the
"1986 Plan"), each person who is not an employee of the Company or any of its
subsidiaries and who is elected a Director of the Company is automatically
entitled to receive an option for 2,000 shares of Common Stock upon his or her
initial election (or, if elected by the Board of Directors, at the time of the
next annual meeting of stockholders), and an option to acquire 2,000 additional
shares upon completion of each next successive year in office. Options granted
under the 1986 Plan have an exercise price equal to the fair market value on the
date of grant, do not become exercisable until the expiration of six months from
the date of grant, and thereafter may be exercised only during certain "window"
periods. Options granted under the 1986 Plan expire ten years after the date of
grant, and terminate 30 days after the holder ceases to be a director, or 90
days following a director's death. Options for 91,000 shares of Common Stock are
currently outstanding under the 1986 Plan.

                             STOCKHOLDER PROPOSALS

     The Company's 2001 Annual Meeting is presently expected to be held on May
3, 2001. Proposals of stockholders intended to be presented at the 2001 Annual
Meeting must be received no later than November 30, 2000, for inclusion in the
Company's Proxy Statement and proxy for that meeting, except that if the date of
the 2000 Annual Meeting is changed by more than 30 calendar days from the
presently expected date, the Company must receive such proposal within a
reasonable time before the Board of Directors makes its proxy solicitation.

     Under the Company's By-Laws, stockholder proposals submitted for action at
the annual meeting but not proposed for inclusion in the Company's Proxy
Statement must be given to the Clerk of the Company not less than 80 nor more
than 120 days prior to the anniversary date of the immediately preceding annual
meeting. Therefore, stockholders who wish to make a proposal at the 2001 Annual
Meeting (other than one that will be included in the Company's proxy materials)
must notify the Company no later than February 12, 2001 and no earlier than
January 3, 2001. In the case of a special meeting of stockholders, or in the
event the annual meeting is called for a date more than 60 days prior to the
anniversary date, a stockholder must give such notice no later than 20 days
following the date on which notice of the meeting date was mailed or publicly
disclosed. Stockholder proposals for nomination of candidates to the Board of
Directors are subject to similar time constraints. Articles V and VII of the
Company's By-Laws contain certain requirements for the content of such
proposals.

            SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Section 16(a) of the Exchange Act requires the Company's directors,
executive officers and holders of more than 10% of the Company's Common Stock
(collectively, "Reporting Persons") to file with the Commission initial reports
of ownership and reports of changes in ownership of Common Stock of the Company.
Such persons are required by regulations of the Commission to furnish the
Company with copies of all such filings. Based on its review of the copies of
such filings received by it with respect to the fiscal year ended December 31,
1999 and written representations from certain Reporting Persons, the Company
believes

                                       16
<PAGE>   20

that all Reporting Persons complied with all Section 16(a) filing requirements
in the fiscal year ended December 31, 1999, except for Allen S. Wyett, a
director of the Company. Mr. Wyett submitted a late report on Form 5 reporting
the sale of 150 shares of Common Stock by the investment manager of an
individual retirement account established by Mr. Wyett who sold such shares
without Mr. Wyett's knowledge.

                                 OTHER MATTERS

     As of this time, the Board of Directors knows of no other matters to be
brought before the meeting. However, if other matters properly come before the
meeting or any adjournment thereof, and if discretionary authority to vote with
respect thereto has been conferred by the enclosed Proxy, the persons named in
the Proxy will vote the Proxy in accordance with their best judgment as to such
matters. Discretionary authority, if conferred by the enclosed Proxy, will
include authority to vote on matters concerning which the Company did not
receive timely notice pursuant to the provisions of the Company's By-Laws (see
"Stockholder Proposals").

                           EXPENSES AND SOLICITATION

     The cost of solicitation of proxies will be borne by the Company. In
addition to soliciting stockholders by mail, certain of the Company's directors,
officers and employees, without additional remuneration, may solicit proxies in
person or by telephone or other means of electronic communication. Brokers and
other custodians, nominees and fiduciaries will be requested to forward
proxy-soliciting material to the owners of stock held in their names, and the
Company will reimburse such brokers and other custodians, nominees and
fiduciaries for their reasonable out-of-pocket costs. Solicitation by directors,
officers and employees of the Company may also be made of some stockholders in
person or by mail, telephone or other means of electronic communication
following the original solicitation. The Company may, if appropriate, retain an
independent proxy solicitation firm to assist in soliciting proxies. If the
Company does so, it will pay such firm's customary fees and expenses.

                                            By Order of the Board of Directors

                                            STEPHEN KORN, Clerk
Watertown, Massachusetts
March 30, 2000

                                       17
<PAGE>   21

                                                                     IONCM-PS-00
<PAGE>   22
                              IONICS, INCORPORATED

                  65 GROVE STREET, WATERTOWN, MASSACHUSETTS 02472

                PROXY FOR ANNUAL MEETING TO BE HELD MAY 2, 2000

          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoints ARTHUR L. GOLDSTEIN and STEPHEN KORN, and each
of them, as Proxies of the undersigned, each with full power to appoint his
substitute, and hereby authorizes both of them, or any one if only one be
present, to represent and to vote, as designated below, all the shares of Common
Stock of Ionics, Incorporated held of record by the undersigned or with respect
to which the undersigned is entitled to vote or act at the Annual Meeting of
Stockholders to be held on May 2, 2000, or at any adjournment thereof.

THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED HEREIN
BY THE UNDERSIGNED STOCKHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE
VOTED FOR PROPOSALS 1 AND 2, WITH DISCRETIONARY AUTHORITY TO VOTE UPON SUCH
OTHER MATTERS AS MAY PROPERLY COME BEFORE THE MEETING.

IF YOU WISH TO VOTE IN ACCORDANCE WITH THE BOARD OF DIRECTORS' RECOMMENDATION,
JUST SIGN AND DATE ON THE REVERSE SIDE. YOU NEED NOT MARK ANY BOXES.

- --------------------------------------------------------------------------------
PLEASE VOTE, DATE AND SIGN ON REVERSE AND RETURN PROMPTLY IN THE ENCLOSED
ENVELOPE.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Please sign exactly as your name(s) appear(s) on the books of the Corporation.
Joint owners should each sign personally. Trustees and other fiduciaries should
indicate the capacity in which they sign, and where more than one name appears,
a majority must sign. If a corporation, this signature should be that of an
authorized officer who should state his or her title.
- --------------------------------------------------------------------------------

HAS YOUR ADDRESS CHANGED?                DO YOU HAVE ANY COMMENTS?

_____________________________________    _______________________________________

_____________________________________    _______________________________________

_____________________________________    _______________________________________



<PAGE>   23


[X] PLEASE MARK VOTES
    AS IN THIS EXAMPLE

                            ------------------------
                              IONICS, INCORPORATED
                            ------------------------

RECORD DATE SHARES:
  401(K) PLAN SHARES:

1. Election of all four Class II Directors listed below.

                                                For All   With-   For All
                                               Nominees   hold    Except
 (01) Arnaud deVitry d'Avaucourt
 (02) William E. Katz                             [ ]      [ ]      [ ]
 (03) Daniel I.C. Wang
 (04) Mark S. Wrighton

NOTE: IF YOU DO NOT WISH YOUR SHARES VOTED "FOR" A PARTICULAR NOMINEE, MARK THE
"FOR ALL EXCEPT" BOX AND STRIKE A LINE THROUGH THE NAME(S) OF THE NOMINEE(S).
YOUR SHARES WILL BE VOTED FOR THE REMAINING NOMINEE(S).


                                                  For    Against  Abstain
2. Proposal to ratify the selection of
   PricewaterhouseCoopers LLP as auditors         [ ]      [ ]      [ ]
   for fiscal year ended December 31, 2000.

3. To consider and act upon such other matters as may properly come before the
   meeting.

   Mark box at right if an address change or comment has been noted on    [ ]
   the reverse side of this card.

                                                                     DETACH CARD



Please be sure to sign and date this Proxy.   Date
                                                   -----------------------------


- ----Stockholder sign here--------------------------Co-owner sign here----------


DETACH CARD


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