Exhibit 3.2

BY- LAWS
of
ENERGY RECOVERY INC.
(adopted April 18, 2001)
(restated February 2, 2004)

Incorporated under the Laws of the State of Delaware

ARTICLE I

OFFICES AND RECORDS

          SECTION 1.1 Delaware Office. The principal office of the Corporation in the State of Delaware shall be located in the City of Wilmington, County of New Castle, and the name and address of its registered agent is the Agents and Corporations, Inc., Twelfth and Orange Streets, Wilmington, Delaware 19889-0511.

          SECTION 1.2 Other Offices. The Corporation may have such other offices, either within or without the State of Delaware, as the Board of Directors may designate or as the business of the Corporation may from time to time require.

          SECTION 1.3 Books and Records. The books and records of the Corporation may be kept outside the State of Delaware at such place or places as may from time to time be designated by the Board of Directors.

ARTICLE II

STOCKHOLDERS

          SECTION 2.1 Annual Meeting. The annual meeting of the stockholders of the Corporation shall be held on such date and at such place and time as may be fixed by resolution of the Board of Directors.

          SECTION 2.2 Special Meeting. Except as otherwise provided in the Certificate of Incorporation, a special meeting of the stockholders of the Corporation may be called at any time by the Board of Directors, the Chairman of the Board or the President and shall be called by the Chairman of the Board, the President or the Secretary at the request in writing of stockholders holding together at least twenty-five percent of the number of shares of stock outstanding and entitled to vote at such meeting. Any special meeting of the stockholders shall be held on such date, at such time and at such place within or without the State of Delaware as the Board of Directors or the officer calling the meeting may designate.

          SECTION 2.3 Place of Meeting. The Board of Directors or the Chairman of the Board, as the case may be, may designate the place of meeting for any annual meeting or for any special meeting of the stockholders called by the Board of Directors or the Chairman of the

Board. If no designation is so made, the place of meeting shall be the principal office of the Corporation.

          SECTION 2.4 Notice of Meeting. Written or printed notice, stating the place, day and hour of the meeting and the purpose or purposes for which the meeting is called, shall be delivered by the Corporation not less than ten (10) days nor more than sixty (60) days before the date of the meeting, either personally or by mail, to each stockholder of record entitled to vote at such meeting. If mailed, such notice shall be deemed to be delivered when deposited in the United States mail with postage thereon prepaid, addressed to the stockholder at his, her or its address as it appears on the stock transfer books of the Corporation. Such further notice shall be given as may be required by law. Meetings may be held without notice if all stockholders entitled to vote are present, or if notice is waived by those not present in accordance with Section 6.4 of these By-Laws.

          SECTION 2.5 Quorum and Adjournment. Except as otherwise provided by law or by the Certificate of Incorporation, the holders of a majority of the outstanding shares of the Corporation entitled to vote generally in the election of directors (the “Voting Stock”), represented in person or by proxy, shall constitute a quorum at a meeting of stockholders, except that when specified business is to be voted on by a class or series of stock voting as a class, the holders of a majority of the shares of such class or series shall constitute a quorum of such class or series for the transaction of such business. A majority of the shares so represented may adjourn the meeting from time to time, whether or not there is such a quorum. No notice of the time and place of adjourned meetings need be given except as required by law. The stockholders present at a duly called meeting at which a quorum is present may continue to transact business until adjournment, notwithstanding the withdrawal of enough stockholders to leave less than a quorum.

          SECTION 2.6 Proxies. At all meetings of stockholders, a stockholder may vote by proxy executed in writing (or in such manner prescribed by the General Corporation Law of the State of Delaware) by the stockholder, or by his duly authorized attorney in fact.

          SECTION 2.7 Procedure for Election of Directors; Required Vote. Election of directors at all meetings of the stockholders at which directors are to be elected shall be by ballot, and, subject to the rights of the holders of any series of Preferred Stock to elect directors under specified circumstances, a plurality of the votes cast thereat shall elect directors. Except as otherwise provided by law, the Certificate of Incorporation, or these By-Laws, in all matters other than the election of directors, the affirmative vote of a majority of the shares present in person or represented by proxy at the meeting and entitled to vote on the matter shall be the act of the stockholders.

          SECTION 2.8 Inspectors of Elections; Opening and Closing the Polls. The Board of Directors by resolution shall appoint one or more inspectors, which inspector or inspectors may include individuals who serve the Corporation in other capacities, including, without limitation, as officers, employees, agents or representatives, to act at the meetings of stockholders and make a written report thereof. One or more persons may be designated as alternate inspectors to replace any inspector who fails to act. If no inspector or alternate has been

appointed to act or is able to act at a meeting of stockholders, the Chairman of the meeting shall appoint one or more inspectors to act at the meeting. Each inspector, before discharging his or her duties, shall take and sign an oath faithfully to execute the duties of inspector with strict impartiality and according to the best of his or her ability. The inspectors shall have the duties prescribed by law.

          The Chairman of the meeting shall fix and announce at the meeting the date and time of the opening and the closing of the polls for each matter upon which the stockholders will vote at a meeting.

          SECTION 2.9 Record Date for Action by Written Consent. In order that the Corporation may determine the stockholders entitled to consent to corporate action in writing without a meeting, the Board of Directors may fix a record date, which record date shall not precede the date upon which the resolution fixing the record date is adopted by the Board of Directors, and which date shall not be more than 10 days after the date upon which the resolution fixing the record date is adopted by the Board of Directors. Any stockholder of record seeking to have the stockholders authorize or take corporate action by written consent shall, by written notice to the Secretary, request the Board of Directors to fix a record date. The Board of Directors shall promptly, but in all events within 10 days after the date on which such a request is received, adopt a resolution fixing the record date. If no record date has been fixed by the Board of Directors within 10 days of the date on which such a request is received, the record date for determining stockholders entitled to consent to corporate action in writing without a meeting, when no prior action by the Board of Directors is required by applicable law, shall be the first date on which a signed written consent setting forth the action taken or proposed to be taken is delivered to the Corporation by delivery to its registered office in Delaware, its principal place of business or to any officer or agent of the Corporation having custody of the book in which proceedings of meetings of stockholders are recorded. Delivery made to the Corporation’s registered office shall be by hand or by certified or registered mail, return receipt requested. If no record date has been fixed by the Board of Directors and prior action by the Board of Directors is required by applicable law, the record date for determining stockholders entitled to consent to corporate action in writing without a meeting shall be at the close of business on the date on which the Board of Directors adopts the resolution taking such prior action.

          SECTION 2.10 Inspectors of Written Consent. In the event of the delivery, in the manner provided by Section 2.9, to the Corporation of the requisite written consent or consents to take corporate action and/or any related revocation or revocations, the Corporation shall engage nationally recognized independent inspectors of elections for the purpose of promptly performing a ministerial review of the validity of the consents and revocations. For the purpose of permitting the inspectors to perform such review, no action by written consent without a meeting shall be effective until such date as the independent inspectors certify to the Corporation that the consents delivered to the Corporation in accordance with Section 2.9 represent at least the minimum number of votes that would be necessary to take the corporate action. Nothing contained in this paragraph shall in any way be construed to suggest or imply that the Board of Directors or any stockholder shall not be entitled to contest the validity of any consent or revocation thereof, whether before or after such certification by the independent inspectors, or to take any other action (including, without limitation, the commencement,

prosecution or defense of any litigation with respect thereto, and the seeking of injunctive relief in such litigation).

          SECTION 2.11 Effectiveness of Written Consent. Every written consent shall bear the date of signature of each stockholder who signs the consent and no written consent shall be effective to take the corporate action referred to therein unless, within 60 days of the date the earliest dated written consent was received in accordance with Section 2.9, a written consent or consents signed by a sufficient number of holders to take such action are delivered to the Corporation in the manner prescribed in Section 2.9.

ARTICLE III

BOARD OF DIRECTORS

          SECTION 3.1 General Powers. The business and affairs of the Corporation shall be managed under the direction of the Board of Directors. In addition to the powers and authorities by these By-Laws expressly conferred upon them, the Board of Directors may exercise all such powers of the Corporation and do all such lawful acts and things as are not by statute or by the Certificate of Incorporation or by these By-Laws required to be exercised or done by the stockholders.

          SECTION 3.2 Number, Tenure and Qualifications. The number of directors constituting the Board of Directors shall be fixed from time to time by resolution passed by a majority of the Board of Directors. The directors shall, except as hereinafter otherwise provided for filling vacancies, be elected at the annual meeting of stockholders, and shall hold office until their respective successors are elected and qualified or until their earlier resignation or removal. Directors need not be stockholders of the Corporation.

          SECTION 3.3 Regular Meetings. A regular meeting of the Board of Directors shall be held without other notice than this By-Law immediately after, and at the same place as, the Annual Meeting of Stockholders. The Board of Directors may, by resolution, provide the time and place for the holding of additional regular meetings without other notice than such resolution.

          SECTION 3.4 Special Meetings. Special meetings of the Board of Directors shall be called at the request of the Chairman of the Board, the President or a majority of the Board of Directors then in office. The person or persons authorized to call special meetings of the Board of Directors may fix the place and time of the meetings.

          SECTION 3.5 Notice. Notice of any special meeting of directors shall be given to each director at his business or residence in writing by hand delivery, first-class or overnight mail or courier service, telegram or facsimile transmission, or orally by telephone. If mailed by first-class mail, such notice shall be deemed adequately delivered when deposited in the United States mails so addressed, with postage thereon prepaid, at least five (5) days before such meeting. If by telegram, overnight mail or courier service, such notice shall be deemed adequately delivered when the telegram is delivered to the telegraph company or the notice is

delivered to the overnight mail or courier service company at least twenty-four (24) hours before such meeting. If by facsimile transmission, such notice shall be deemed adequately delivered when the notice is transmitted at least twelve (12) hours before such meeting. If by telephone or by hand delivery, the notice shall be given at least twelve (12) hours prior to the time set for the meeting. Neither the business to be transacted at, nor the purpose of, any regular or special meeting of the Board of Directors need be specified in the notice of such meeting, except for amendments to these By-Laws, as provided under Section 8.1. A meeting may be held at any time without notice if all the directors are present or if those not present waive notice of the meeting in accordance with Section 6.4 of these By-Laws.

          SECTION 3.6 Action by Consent of Board of Directors. Any action required or permitted to be taken at any meeting of the Board of Directors or of any committee thereof may be taken without a meeting if all members of the Board or committee, as the case may be, consent thereto in writing, and the writing or writings are filed with the minutes of proceedings of the Board or committee.

          SECTION 3.7 Conference Telephone Meetings. Members of the Board of Directors, or any committee thereof, may participate in a meeting of the Board of Directors or such committee by means of conference telephone or similar communications equipment by means of which all persons participating in the meeting can hear each other, and such participation in a meeting shall constitute presence in person at such meeting.

          SECTION 3.8 Quorum. Subject to Section 3.9, a whole number of directors equal to at least a majority of the total number of directors which the Corporation would have if there were no vacancies (“Whole Board”) shall constitute a quorum for the transaction of business, but if at any meeting of the Board of Directors there shall be less than a quorum present, a majority of the directors present may adjourn the meeting from time to time without further notice. The act of the majority of the directors present at a meeting at which a quorum is present shall be the act of the Board of Directors. The directors present at a duly organized meeting may continue to transact business until adjournment, notwithstanding the withdrawal of enough directors to leave less than a quorum.

          SECTION 3.9 Vacancies. Subject to applicable law and the rights of the holders of any series of Preferred Stock with respect to such series of Preferred Stock, and unless the Board of Directors otherwise determines, vacancies resulting from death, resignation, retirement, disqualification, removal from office or other cause, and newly created directorships resulting from any increase in the authorized number of directors, may be filled only by the affirmative vote of a majority of the remaining directors, though less than a quorum of the Board of Directors, and directors so chosen shall hold office for a term expiring at the next annual meeting of stockholders and until such director’s successor shall have been duly elected and qualified. No decrease in the number of authorized directors constituting the Whole Board shall shorten the term of any incumbent director.

          SECTION 3.10 Committees. The Board of Directors may, by resolution adopted by a majority of the Whole Board, designate one or more committees. Each such committee shall consist of two or more directors of the Corporation. The Board may designate

one or more directors as alternate members of any committee, who may replace any absent or disqualified member at any meeting of the committee. Any such committee may to the extent permitted by law exercise such powers and shall have such responsibilities as shall be specified in the designating resolution. In the absence or disqualification of any member of such committee or committees, the member or members thereof present at any meeting and not disqualified from voting, whether or not constituting a quorum, may unanimously appoint another member of the Board to act at the meeting in the place of any such absent or disqualified member. Each committee shall keep written minutes of its proceedings and shall report such proceedings to the Board when required.

          A majority of any committee may determine its action and fix the time and place of its meetings, unless the Board shall otherwise provide. Notice of such meetings shall be given to each member of the committee in the manner provided for in Section 3.5 of these By-Laws. The Board shall have power at any time to fill vacancies in, to change the membership of, or to dissolve any such committee. Nothing herein shall be deemed to prevent the Board from appointing one or more committees consisting in whole or in part of persons who are not directors of the Corporation; provided, however, that no such committee shall have or may exercise any authority of the Board.

          No committee shall have the power or authority in reference to amending the Certificate of Incorporation, adopting an agreement of merger or consolidation, recommending to the stockholders the sale, lease or exchange of all or substantially all of the Corporation’s property and assets, recommending to the stockholders a dissolution of the Corporation or a revocation of a dissolution, or amending these By-Laws. Unless a resolution adopted by the Board of Directors, these By-laws, or the Certificate of Incorporation expressly so provide, no such committee shall have the power or authority to declare a dividend or to authorize the issuance of stock.

          SECTION 3.11 Records, The Board of Directors shall cause to be kept a record containing the minutes of the proceedings of the meetings of the Board and of the stockholders, appropriate stock books and registers and such books of records and accounts as may be necessary for the proper conduct of the business of the Corporation.

ARTICLE IV

OFFICERS

          SECTION 4.1 Elected Officers. The elected officers of the Corporation shall be a Chairman of the Board of Directors, a President, a Secretary, a Treasurer, and such other officers (including, without limitation, a Chief Operating Officer and Chief Financial Officer) as the Board of Directors from time to time may deem proper. The Chairman of the Board shall be chosen from among the directors. All officers elected by the Board of Directors shall each have such powers and duties as generally pertain to their respective offices, subject to the specific provisions of this ARTICLE IV. Such officers shall also have such powers and duties as from time to time may be conferred by the Board of Directors or by any committee thereof. The Board or any committee thereof may from time to time elect, or the Chairman of the Board or

President may appoint, such other officers (including one or more Assistant Vice Presidents, Assistant Secretaries, Assistant Treasurers, and Assistant Controllers) and such agents, as may be necessary or desirable for the conduct of the business of the Corporation. Such other officers and agents shall have such duties and shall hold their offices for such terms as shall be provided in these By-Laws or as may be prescribed by the Board or such committee or by the Chairman of the Board or President, as the case may be.

          SECTION 4.2 Election and Term of Office. The elected officers of the Corporation shall be elected annually by the Board of Directors at the regular meeting of the Board of Directors held after the annual meeting of the stockholders. If the election of officers shall not be held at such meeting, such election shall be held as soon thereafter as convenient. Each officer shall hold office until his successor shall have been duly elected and shall have qualified or until his death or until he shall resign, but any officer may be removed from office at any time by the affirmative vote of a majority of the Whole Board or, except in the case of an officer or agent elected by the Board, by the Chairman of the Board or President. Such removal shall be without prejudice to the contractual rights, if any, of the person so removed.

          SECTION 4.3 Chairman of the Board. The Chairman of the Board shall preside at all meetings of the stockholders and of the Board of Directors. The Chairman of the Board shall perform all duties incidental to his office which may be required by law and all such other duties as are properly required of him by the Board of Directors. He shall make reports to the Board of Directors and the stockholders, and shall see that all orders and resolutions of the Board of Directors and of any committee thereof are carried into effect. The Chairman of the Board may also serve as President, if so elected by the Board.

          SECTION 4.4 President. The President shall act in a general executive capacity and shall be the Chief Executive Officer of the Company. The President shall be responsible for the administration and operation of the Corporation’s business and general supervision of its policies and affairs. The President shall, in the absence of or because of the inability to act of the Chairman of the Board, perform all duties of the Chairman of the Board and preside at all meetings of stockholders and of the Board of Directors.

          SECTION 4.5 Chief Operating Officer. The Chief Operating Officer (if any) shall be a Vice President and act in an executive capacity with respect to the Corporation’s operations. He shall assist the President in the general supervision of the Corporation’s operations and affairs.

          SECTION 4.6 Chief Financial Officer. The Chief Financial Officer (if any) shall be a Vice President and act in an executive financial capacity. He shall assist the President in the general supervision of the Corporation’s financial policies and affairs.

          SECTION 4.7 Treasurer. The Treasurer shall exercise general supervision over the receipt, custody and disbursement of corporate funds. The Treasurer shall cause the funds of the Corporation to be deposited in such banks as may be authorized by the Board of Directors, or in such banks as may be designated as depositaries in the manner provided by resolution of the Board of Directors. He shall have such further powers and duties and shall be

subject to such directions as may be granted or imposed upon him from time to time by the Board of Directors, the Chairman of the Board or the President.

          SECTION 4.8 Secretary. The Secretary shall keep or cause to be kept in one or more books provided for that purpose, the minutes of all meetings of the Board, the committees of the Board and the stockholders; he shall see that all notices are duly given in accordance with the provisions of these By-Laws and as required by law; he shall be custodian of the records and the seal of the Corporation and affix and attest the seal to all stock certificates of the Corporation (unless the seal of the Corporation on such certificates shall be a facsimile, as hereinafter provided) and affix and attest the seal to all other documents to be executed on behalf of the Corporation under its seal; and he shall see that the books, reports, statements, certificates and other documents and records required by law to be kept and filed are properly kept and filed; and in general, he shall perform all the duties incident to the office of Secretary and such other duties as from time to time may be assigned to him by the Board, the Chairman of the Board or the President.

          SECTION 4.9 Removal. Any officer elected, or agent appointed, by the Board of Directors may be removed by the affirmative vote of a majority of the Whole Board whenever, in their judgment, the best interests of the Corporation would be served thereby. Any officer or agent appointed by the Chairman of the Board or the President may be removed by him whenever, in his judgment, the best interests of the Corporation would be served thereby. No elected officer shall have any contractual rights against the Corporation for compensation by virtue of such election beyond the date of the election of his successor, his death, his resignation or his removal, whichever event shall first occur, except as otherwise provided in an employment contract or under an employee deferred compensation plan.

          SECTION 4.10 Vacancies. A newly created elected office and a vacancy in any elected office because of death, resignation, or removal may be filled by the Board of Directors for the unexpired portion of the term at any meeting of the Board of Directors. Any vacancy in an office appointed by the Chairman of the Board or the President because of death, resignation, or removal may be filled by the Chairman of the Board or the President.

ARTICLE V

STOCK CERTIFICATES AND TRANSFERS

          SECTION 5.1 Stock Certificates and Transfers. The interest of each stockholder of the Corporation shall be evidenced by certificates for shares of stock in such form as the appropriate officers of the Corporation may from time to time prescribe. The shares of the stock of the Corporation shall be transferred on the books of the Corporation by the holder thereof in person or by his attorney, upon surrender for cancellation of certificates for at least the same number of shares, with an assignment and power of transfer endorsed thereon or attached thereto, duly executed, with such proof of the authenticity of the signature as the Corporation or its agents may reasonably require.

          The certificates of stock shall be signed, countersigned and registered in such manner as the Board of Directors may by resolution prescribe, which resolution may permit all or any of the signatures on such certificates to be in facsimile. In case any officer, transfer agent or registrar who has signed or whose facsimile signature has been placed upon a certificate has ceased to be such officer, transfer agent or registrar before such certificate is issued, it may be issued by the Corporation with the same effect as if he were such officer, transfer agent or registrar at the date of issue.

          SECTION 5.2 Lost, Stolen or Destroyed Certificates. No certificate for shares of stock in the Corporation shall be issued in place of any certificate alleged to have been lost, destroyed or stolen, except on production of such evidence of such loss, destruction or theft and on delivery to the Corporation of a bond of indemnity in such amount, upon such terms and secured by such surety, as the Board of Directors or any financial officer may in its or his discretion require.

ARTICLE VI

MISCELLANEOUS PROVISIONS

          SECTION 6.1 Fiscal Year. The fiscal year of the Corporation shall end on December 31st of each year.

          SECTION 6.2 Dividends. The Board of Directors may from time to time declare, and the Corporation may pay, dividends on its outstanding shares in the manner and upon the terms and conditions provided by law and the Certificate of Incorporation.

          SECTION 6.3 Seal. The corporate seal shall have inscribed thereon the words “Corporate Seal”, the year of incorporation and around the margin thereof the words “Energy Recovery, Inc. * Delaware *.”

          SECTION 6.4 Waiver of Notice. Whenever any notice is required to be given to any stockholder or director of the Corporation under the provisions of the General Corporation Law of the State of Delaware or these By-Laws, a waiver thereof in writing, signed by the person or persons entitled to such notice, whether before or after the time stated therein, shall be deemed equivalent to the giving of such notice. Neither the business to be transacted at, nor the purpose of, any annual or special meeting of the stockholders or the Board of Directors or committee thereof need be specified in any waiver of notice of such meeting.

          SECTION 6.5 Audits. The accounts, books and records of the Corporation shall be audited upon the conclusion of each fiscal year by an independent certified public accountant selected by the Board of Directors, and it shall be the duty of the Board of Directors to cause such audit to be done annually.

          SECTION 6.6 Resignations. Any director or any officer, whether elected or appointed, may resign at any time by giving written notice of such resignation to the Chairman

of the Board, the President, or the Secretary, and such resignation shall be deemed to be effective as of the close of business on the date said notice is received by the Chairman of the Board, the President, or the Secretary, or at such later time as is specified therein. No formal action shall be required of the Board of Directors or the stockholders to make any such resignation effective.

          SECTION 6.7 Indemnification and Insurance.

          (A) Nature of Indemnity. The Corporation shall indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative, by reason of the fact that he or she is or was or has agreed to become a director or officer of the Corporation, or is or was serving or has agreed to serve at the request of the Corporation as a director or officer of another corporation, limited liability company, partnership, joint venture, trust or other enterprise, or by reason of any action alleged to have been taken or omitted in such capacity, and may indemnify any person who was or is a party or is threatened to be made a party to such an action, suit or proceeding by reason of the fact that he or she is or was or has agreed to become an employee or agent of the Corporation, or is or was serving or has agreed to serve at the request of the Corporation as an employee or agent of another corporation, limited liability company, partnership, joint venture, trust or other enterprise, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by him or on his or her behalf in connection with such action, suit or proceeding and any appeal therefrom, if he or she acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful; except that in the case of an action or suit by or in the right of the Corporation to procure a judgment in its favor (1) such indemnification shall be limited to expenses (including attorneys’ fees) actually and reasonably incurred by such person in the defense or settlement of such action or suit, and (2) no indemnification shall be made in respect of any claim, issue or matter as to which such person shall have been adjudged to be liable to the Corporation unless and only to the extent that the Delaware Court of Chancery or the court in which such action or suit was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which the Delaware Court of Chancery or such other court shall deem proper.

          The termination of any action, suit or proceeding by judgment, order, settlement, conviction, or upon a plea of nolo contendere or its equivalent, shall not, of itself, create a presumption that the person did not act in good faith and in a manner which he or she reasonably believed to be in or not opposed to the best interests of the Corporation, and, with respect to any criminal action or proceeding, had reasonable cause to believe that his conduct was unlawful.

          (B) Successful Defense. To the extent that a director, officer, employee or agent of the Corporation has been successful on the merits or otherwise in defense of any action, suit or proceeding referred to in (A) of this Section 6.7 or in defense of any claim, issue or matter therein, he or she shall be indemnified against expenses (including attorneys’ fees) actually and reasonably incurred by him in connection therewith.

          (C) Determination that Indemnification is Proper. Any indemnification of a director or officer of the Corporation under (A) of this Section 6.7 (unless ordered by a court) shall be made by the Corporation unless a determination is made that indemnification of the director or officer is not proper in the circumstances because he or she has not met the applicable standard of conduct set forth in (A). Any indemnification of an employee or agent of the Corporation under (A) (unless ordered by a court) may be made by the Corporation upon a determination that indemnification of the employee or agent is proper in the circumstances because he or she has met the applicable standard of conduct set forth in (A). Any such determination shall be made (1) by the Board of Directors by a majority vote of a quorum consisting of directors who were not parties to such action, suit or proceeding, or (2) if such a quorum is not obtainable, or, even if obtainable a quorum of disinterested directors so directs, by independent legal counsel in a written opinion, or (3) by the stockholders.

          (D) Advance Payment of Expenses. Unless the Board of Directors otherwise determines in a specific case, expenses incurred by a director or officer in defending a civil or criminal action, suit or proceeding shall be paid by the Corporation in advance of the final disposition of such action, suit or proceeding upon receipt of an undertaking by or on behalf of the director or officer to repay such amount if it shall ultimately be determined that he or she is not entitled to be indemnified by the Corporation as authorized in this Section 6.7. Such expenses incurred by other employees and agents may be so paid upon such terms and conditions, if any, as the Board of Directors deems appropriate. The Board of Directors may authorize the Corporation’s legal counsel to represent such director, officer, employee or agent in any action, suit or proceeding, whether or not the Corporation is a party to such action, suit or proceeding.

          (E) Survival; Preservation of Other Rights. The foregoing indemnification provisions shall be deemed to be a contract between the Corporation and each director, officer, employee and agent who serves in any such capacity at any time while these provisions as well as the relevant provisions of the Delaware General Corporation Law are in effect and any repeal or modification thereof shall not affect any right or obligation then existing with respect to any state of facts then or previously existing or any action, suit, or proceeding previously or thereafter brought or threatened based in whole or in part upon any such state of facts. Such a contract right may not be modified retroactively without the consent of such director, officer, employee or agent.

          The indemnification provided by this Section 6.7 shall not be deemed exclusive of any other rights to which those indemnified may be entitled under any by-law, agreement, vote of stockholders or disinterested directors or otherwise, both as to action in his or her official capacity and as to action in another capacity while holding such office, and shall continue as to a person who has ceased to be a director, officer, employee or agent and shall inure to the benefit of the heirs, executors and administrators of such a person. The Corporation may enter into an agreement with any of its directors, officers, employees or agents providing for indemnification and advancement of expenses, including attorneys fees, that may change, enhance, qualify or limit any right to indemnification or advancement of expenses created by this Section 6.7.

          (F) Severability. If this Section 6.7 or any portion hereof shall be invalidated on any ground by any court of competent jurisdiction, then the Corporation shall nevertheless indemnify each director or officer and may indemnify each employee or agent of the Corporation as to costs, charges and expenses (including attorneys’ fees), judgment, fines and amounts paid in settlement with respect to any action, suit or proceeding, whether civil, criminal, administrative or investigative, including an action by or in the right of the Corporation, to the fullest extent permitted by any applicable portion of this Section 6.7 that shall not have been invalidated and to the fullest extent permitted by applicable law.

          (G) Subrogation. In the event of payment of indemnification to a person described in (A) of this Section 6.7 the Corporation shall be subrogated to the extent of such payment to any right of recovery such person may have and such person as a condition of receiving indemnification from the Corporation, shall execute all documents and do all things that the Corporation may deem necessary or desirable to perfect such right of recovery, including the execution of such documents necessary to enable the Corporation effectively to enforce any such recovery.

          (H) No Duplication of Payments. The Corporation shall not be liable under this Section 6.7 to make any payment in connection with any claim made against a person described in (A) of this Section 6.7 to the extent such person has otherwise received payment (under any insurance policy, by-law or otherwise) of the amounts otherwise indemnifiable hereunder.

          (I) Insurance. The Corporation may maintain insurance, at its expense, to protect itself and any director, officer, employee or agent of the Corporation or another corporation, limited liability company, partnership, joint venture, trust or other enterprise against any expense, liability or loss, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the General Corporation Law of the State of Delaware. To the extent that the Corporation maintains any policy or policies providing such insurance, each such director or officer, and each such agent or employee to which rights to indemnification have been granted, shall be covered by such policy or policies in accordance with its or their terms to the maximum extent of the coverage thereunder for any such director, officer, employee or agent.

ARTICLE VII

CONTRACTS, PROXIES, ETC.

          SECTION 7.1. Contracts. Except as otherwise required by law, the Certificate of Incorporation or these By-Laws, any contracts or other instruments may be executed and delivered in the name and on the behalf of the Corporation by such officer or officers of the Corporation as the Board of Directors may from time to time direct. Such authority may be general or confined to specific instances as the Board may determine. The Chairman of the Board, the President or any Vice President may execute bonds, contracts, deeds, leases and other instruments to be made or executed for or on behalf of the Corporation. Subject to any restrictions imposed by the Board of Directors, the President or any Vice President of the

Corporation may delegate contractual powers to others under his or her jurisdiction, it being understood, however, that any such delegation of power shall not relieve such officer of responsibility with respect to the exercise of such delegated power.

          SECTION 7.2 Proxies. Unless otherwise provided by resolution adopted by the Board of Directors, the Chairman of the Board, the President or any Vice President may from time to time appoint an attorney or attorneys or agent or agents of the Corporation, in the name and on behalf of the Corporation, to cast the votes which the Corporation may be entitled to cast as the holder of stock or other securities or membership interests in any other corporation or limited liability company, any of whose stock or other securities or membership interests may be held by the Corporation, at meetings of the holders of the stock or other securities or membership interests of such other corporation or limited liability company, or to consent in writing, in the name of the Corporation as such holder, to any action by such other corporation or limited liability company, and may instruct the person or persons so appointed as to the manner of casting such votes or giving such consent, and may execute or cause to be executed in the name and on behalf of the Corporation and under its corporate seal or otherwise, all such written proxies or other instruments as he may deem necessary or proper in the premises.

ARTICLE VIII

AMENDMENTS

          SECTIONS 8.1 Amendments. These By-Laws may be altered, amended, or repealed at any meeting of the Board of Directors or of the stockholders, provided notice of the proposed change was given in the notice of the meeting and, in the case of a meeting of the Board of Directors, in a notice given not less than two days prior to the meeting.

SECRETARY’S CERTIFICATE OF RESTATEMENT OF

THE BY-LAWS OF ENERGY RECOVERY, INC.

     I hereby certify:

     That I am the duly appointed Secretary of Energy Recovery, Inc., a Delaware corporation;

     That the foregoing By-Laws comprising thirteen (13) pages, constitute the By-Laws of said corporation as duly adopted by the Board of Directors of the Corporation on April 18, 2001 when it was known as ERI Corp., and restated on February 2, 2004 and now known as Energy Recovery, Inc.

     IN WITNESS WHEREOF, I have hereunder subscribed my name this 2^nd day of February, 2004.