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SEC 1745 (02-02)

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[ ]

Rule 13d-1(b)

[ x ]

Rule 13d-1(c)

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Rule 13d-1(d)

CUSIP No. 14964W104

1.

Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

2.

Check the Appropriate Box if a Member of a Group (See Instructions)

(a)

X

(b)

3.

SEC Use Only ............................................................................................................................................

4.

Citizenship or Place of Organization

California

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With

5.

Sole Voting Power 10,979,051

6.

Shared Voting Power 0

7.

Sole Dispositive Power 10,979,051

8.

Shared Dispositive Power 0

9.

Aggregate Amount Beneficially Owned by Each Reporting Person 10,979,051

10.

Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions).................................

11.

Percent of Class Represented by Amount in Row (9) 5.66%

12.

Type of Reporting Person (See Instructions) OO (Revocable Trust)

Item 1.

(a)

Name of Issuer: Cavitation Technologies, Inc.

(b)

Address of Issuer's Principal Executive Offices:

10019 Canoga Ave.

Chatsworth, CA 91311

Item 2.

(a)

Name of Person Filing:

Jon D. & Linda W. Gruber Revocable Trust

(b)

Address of Principal Business Office or, if none, Residence:

300 Tamal Plaza, Ste. 280, Corte Madera, CA 94925

(c)

Citizenship: See item 4 of cover sheet.

(d)

Title of Class of Securities: Common Stock

(e)

CUSIP Number: 14964W104

Item 3.

If this statement is filed pursuant to 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 Act (15 U.S.C. 78o).

(b)

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Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c)

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Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d)

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Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).

(e)

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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 240.13d-1(b)(1)(ii)(G);

(h)

[ ]

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

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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)

[x]

Group, in accordance with 240.13d-1(b)(1)(ii)(J).

Item 4.

Ownership.

See Items 5-9 and 11 of the cover page for each Filer.

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 [].

Item 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Not Applicable

Item 8.

Identification and Classification of Members of the Group

Not Applicable

Item 9.

Notice of Dissolution of Group

Not Applicable

Item 10.

Certification

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Dated: April 14, 2017

Jon D. & Linda W. Gruber Revocable Trust

By: /s/ Jon D Gruber

Name/Title: Jon D Gruber, Trustee

Attention:

Intentional misstatements or omissions of fact constitute Federal criminal violations
(See 18 U.S.C. 1001)