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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 2)*


Energy Recovery, Inc.
(Name of Issuer)


Common stock, $0.001 par value per share
(Title of Class of Securities)


29270J100
(CUSIP Number)


March 18, 2009
(Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
 
[_]  Rule 13d-1(b)

[_]  Rule 13d-1(c)

[X]  Rule 13d-1(d)

__________
*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.
 
The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).
 

 
 
 


CUSIP No
29270J100
    
     
1.
NAME OF REPORTING PERSONS
  
 
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
  
     
 
Arvarius AS
  
     
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
   
(a)  [_]
   
(b)  [X]
     
3.
SEC USE ONLY
  
     
     
     
4.
CITIZENSHIP OR PLACE OF ORGANIZATION
  
     
 
Norway
  
     
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
     
5.
SOLE VOTING POWER
  
     
 
0
  
     
6.
SHARED VOTING POWER
  
     
 
7,641,103
  
     
7.
SOLE DISPOSITIVE POWER
  
     
 
0
  
     
8.
SHARED DISPOSITIVE POWER
  
     
 
7,641,103
  
     
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     
 
7,641,103
  
     
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
  
   
[_]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
  
     
 
14.4%
  
     
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
 
CO
  

 
 
 


CUSIP No
29270J100
    
     
1.
NAME OF REPORTING PERSONS
  
 
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
  
     
 
Marius Skaugen
  
     
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
   
(a)  [_]
   
(b)  [X]
     
3.
SEC USE ONLY
  
     
     
     
4.
CITIZENSHIP OR PLACE OF ORGANIZATION
  
     
 
Norway
  
     
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
     
5.
SOLE VOTING POWER
  
     
 
0
  
     
6.
SHARED VOTING POWER
  
     
 
7,641,103
  
     
7.
SOLE DISPOSITIVE POWER
  
     
 
0
  
     
8.
SHARED DISPOSITIVE POWER
  
     
 
7,641,103
  
     
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     
 
7,641,103
  
     
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
  
   
[_]
     
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
  
     
 
14.4%
  
     
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IN
  

 
 
 


CUSIP No
29270J100
    

Item 1.
(a).
Name of Issuer:
  
       
   
Energy Recovery, Inc.
  

 
(b).
Address of Issuer's Principal Executive Offices:
  
       
   
1717 Doolittle Drive, San Leandro, CA 94577
  

Item 2.
(a).
Name of Person Filing:
  
       
   
Arvarius AS
Marius Skaugen
  

 
(b).
Address of Principal Business Office, or if None, Residence:
  
       
   
Arvarius AS
c/o Marius Skaugen
Parkveien 57
c/o B. Skaugen AS
0256, Oslo, Norway
 
Arvarius AS
Parkveien 57
c/o B. Skaugen AS
0256, Oslo, Norway
  

 
(c).
Citizenship:
  
       
   
Arvarius AS - Norway
Marius Skaugen - Norway
  

 
(d).
Title of Class of Securities:
  
       
   
Common stock, $0.001 par value per share
  

 
(e).
CUSIP Number:
  
       
   
29270J100
  

Item 3.
  
If This Statement is filed pursuant to ss.240.13d-1(b) or 240.13d-2(b), or (c), check whether the person filing is a

 
(a)
[_]
Broker or dealer registered under Section 15 of the Exchange Act (15 U.S.C. 78c).

 
(b)
[_]
Bank as defined in Section 3(a)(6) of the Exchange Act (15 U.S.C. 78c).

 
(c)
[_]
Insurance company as defined in Section 3(a)(19) of the Exchange Act (15 U.S.C. 78c).


 
 
 


 
(d)
[_]
Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

 
(e)
[_]
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

 
(f)
[_]
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

 
(g)
[_]
A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

 
(h)
[_]
A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C.1813);

 
(i)
[_]
A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

 
(j)
[_]
Group, in accordance with s.240.13d-1(b)(1)(ii)(J).

 
Item 4.
Ownership.

 
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

 
(a)
Amount beneficially owned:
     
   
7,641,103 shares deemed beneficially owned by Arvarius AS
7,641,103 shares deemed beneficially owned by Marius Skaugen

 
(b)
Percent of class:
     
   
14.4% deemed beneficially owned by Arvarius AS
14.4% deemed beneficially owned by Marius Skaugen

 
(c)
Number of shares as to which Arvarius AS has:
     
   
(i)
Sole power to vote or to direct the vote
0
,
         
   
(ii)
Shared power to vote or to direct the vote
7,641,103
,
         
   
(iii)
Sole power to dispose or to direct the disposition of
0
,
         
   
(iv)
Shared power to dispose or to direct the disposition of
7,641,103
.
         

   
Number of shares as to which Marius Skaugen has:

   
(i)
Sole power to vote or to direct the vote
0
,
         
   
(ii)
Shared power to vote or to direct the vote
7,641,103
,
         
   
(iii)
Sole power to dispose or to direct the disposition of
0
,
         
   
(iv)
Shared power to dispose or to direct the disposition of
7,641,103
.
 
 
 

 
Item 5.
Ownership of Five Percent or Less of a Class.

 
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [_].
 
 
N/A

Item 6.
Ownership of More Than Five Percent on Behalf of Another Person.

 
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the class, such person should be identified.  A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
 
 
N/A

Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.

 
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary.  If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
 
 
N/A
 
Item 8.
Identification and Classification of Members of the Group.

 
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group.  If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
 
 
N/A

Item 9.
Notice of Dissolution of Group.

 
Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity.  See Item 5.
 
 
N/A

Item 10.
Certification.

 
N/A


 
 
 


SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
 

 
March 19, 2010
 
(Date)
   
   
 
Arvarius AS
 
 
/s/ Marius Skaugen
 
By: Marius Skaugen
 
Title: Director
   
   
 
MARIUS SKAUGEN
   
 
/s/ Marius Skaugen
   




 

 
 
 

Exhibit A
 
AGREEMENT
 
The undersigned agree that this Amendment 2 to Schedule 13G dated March 19, 2010 relating to the Common stock, $0.001 par value per share, of Energy Recovery, Inc., shall be filed on behalf of the undersigned.
 
   
   
 
Arvarius AS
 
 
/s/ Marius Skaugen
 
By: Marius Skaugen
 
Title: Director
   
   
 
MARIUS SKAUGEN
   
 
/s/ Marius Skaugen
   





SK 26662 0001 1082341