Exhibit 5.1

RICHARDSON & PATEL LLP

10900 Wilshire Blvd.

Suite 500

Los Angeles, California 90024

Tel (310) 208-1182

Fax (310) 208-1154

June 17, 2011

Board of Directors

Sionix Corporation

914 Westwood Boulevard, Box 801

Los Angeles, California 90024

Re:           8,000,000 Shares Registered on Form S-8

Gentlemen:

We have acted as counsel to Sionix Corporation, a Nevada corporation (the “Company”), in connection with the preparation of the filing with the Securities and Exchange Commission under the Securities Act of 1933 of the Company’s Registration Statement on Form S-8 relating to 8,000,000 shares of the Company’s common stock (the “Shares”).

In connection with that registration, we have reviewed the proceedings of the Board of Directors of the Company relating to the registration and proposed issuance of the Shares, the Articles of Incorporation of the Company and all amendments thereto, the Bylaws of the Company and all amendments thereto, and such other documents and matters as we have deemed necessary to the rendering of the following opinion.

Based upon that review, it is our opinion that the Shares, when issued, will be legally issued, fully paid, and nonassessable.  We do not find it necessary for the purposes of this opinion to cover, and accordingly we express no opinion as to the application of the securities or blue sky laws of the various states of the United States to the issuance and sale of the Shares.

We consent to the use of this opinion in the registration statement filed with the Securities and Exchange Commission in connection with the registration of the Shares.

 /s/ Richardson & Patel LLP

      RICHARDSON & PATEL LLP