<PAGE>   1

    As filed with the Securities and Exchange Commission on February 9, 2001
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                               SIONIX CORPORATION
             (Exact name of registrant as specified in its charter)

            UTAH                                        87-0428526
(State or other jurisdiction of                      (I.R.S. Employer
incorporation or organization)                      Identification No.)

                               9272 JERONIMO ROAD
                                IRVINE, CA 92618
               (Address of Principal Executive Office) (Zip Code)

                              CONSULTING AGREEMENT
                            (Full title of the plan)

                                 JAMES J. HOUTZ
                               9272 JERONIMO ROAD
                                IRVINE, CA 92618
                     (Name and address of agent for service)

                                 (949) 454-9283
          (Telephone number, including area code, of agent for service)

                                    COPY TO:
                             ROBERT J. ZEPFEL, ESQ.
                               HADDAN & ZEPFEL LLP
                         4685 MACARTHUR COURT, SUITE 220
                             NEWPORT BEACH, CA 92660
                                 (949) 752-6100

                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>

======================================================================================================
                                           Proposed Maximum      Proposed Maximum
Title of Securities         Amount to       Offering Price      Aggregate Offering       Amount of
to Be Registered          Be Registered      Per Share(1)            Price(1)         Registration Fee
------------------------------------------------------------------------------------------------------
<S>                       <C>              <C>                  <C>                   <C>
Common Stock, without
  par value                  260,000             $.25                $65,000               $16.25
======================================================================================================
</TABLE>

(1) Estimated solely for the purpose of calculating the amount of the
    registration fee pursuant to Rule 457, based on the closing price of the
    Common Stock, as reported by the OTC Bulletin Board, on January 29, 2001.

================================================================================
<PAGE>   2

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

     The following document filed with the Securities and Exchange Commission
(the "Commission") pursuant to the Securities Exchange Act of 1934, as amended
(the "Exchange Act") by Sionix Corporation (the "Company") is hereby
incorporated by reference in this Registration Statement except as superseded or
modified herein: the Annual Report on Form 10-K for the year ended September 30,
2000, including any amendment or reports filed for the purpose of updating such
description. All documents filed by the Company with the Commission pursuant to
Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this
Registration Statement and prior to the time a post- effective amendment which
indicates that the securities offered hereby have been sold or which deregisters
all securities then remaining unsold, shall be deemed to be incorporated by
reference into this Registration Statement and to be a part hereof from the date
of filing of such documents. Any statement contained in any document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of this Registration Statement to the
extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as modified or superseded, to constitute
a part of this Registration Statement.

ITEM 4. DESCRIPTION OF SECURITIES

     Not applicable

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL

     Not applicable.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Under Section 16-10a-903 of the Utah Revised Business Corporation Act (the
"URBCA"), and the Company's Articles of Incorporation, the Company is required
to indemnify a director or officer who is successful, on the merits or
otherwise, in the defense of any proceeding, or in the defense of any claim,
issue, or matter in the proceeding, to which he was a party because he is or was
a director of the corporation, against reasonable expenses incurred by him in
connection with the proceeding or claim with respect to which he has been
successful. Pursuant to Section 16-10a-902 and subject to Section 16- 10a-906,
the Company may indemnify a director for reasonable expenses incurred in a
proceeding. The Company's Articles of Incorporation contain certain provisions
permitted under the Utah Revised Business Corporation Act, relating to the
liability of directors. These provisions eliminate the liability of a director
to the Company or to its shareholders for monetary damages for any action taken
or any failure to take any action, as a director, except liability for: (a) the
amount of a financial benefit received by a director to which he or she is not
entitled; (b) an intentional infliction of harm on the Company or the
shareholders; (c) a violation of Section 16-10a-842 (regarding unlawful
distributions); or (d) an intentional violation of criminal law. These
provisions do not limit or eliminate the rights of the Company or any
shareholder to seek non-monetary relief, such as an injunction or rescission, in
the event


                                       2

<PAGE>   3

of a breach of a director's fiduciary duty. These provisions do not alter a
director's liability under federal securities laws. The Company's By-laws also
contains certain provisions permitted under the URBCA relating to
indemnification of directors and officers of the Company. In general, these
provisions permit the indemnification of directors and officers in certain
circumstances if the person seeking indemnification acted 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 Company, and with respect to any criminal action or proceeding,
had not reasonable cause to believe his or her conduct was unlawful. The
provisions also provide for the reimbursement and/or advancement of expenses to
directors and officers under certain circumstances, which provisions are
consistent with the URBCA. Insofar as indemnification for liabilities arising
under the Securities Act of 1933 may be permitted to directors, officers or
persons controlling the company pursuant to the foregoing provisions, the
Company has been informed that in the opinion of the securities and exchange
commission such indemnification is against public policy as expressed in the act
and is therefore unenforceable.

ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable

ITEM 8. EXHIBITS.

      5.1   Opinion of Haddan & Zepfel LLP

     23.1   Consent of Cacciamatta Accountancy Corporation

     23.2   Consent of HJ & Associates

     24.2   Consent of Haddan & Zepfel LLP (included in Exhibit 5.1)

ITEM 9. UNDERTAKINGS.

     The undersigned registrant hereby undertakes:

     (a)(1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement:

            (i) To include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933 (the "Securities Act");

            (ii) To reflect in the prospectus any facts or events arising after
the effective date of the registration statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represents a fundamental change in the information set forth in the registration
statement;

            (iii) To include any material information with respect to the plan
of distribution not previously disclosed in the registration statement or any
material change to such information in the registration statement.


                                       3

<PAGE>   4

         Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed by the registrant
pursuant to Section 13 or Section 15(d) of the Exchange Act that are
incorporated by reference in the registration statement.

     (2) That, for the purpose of determining any liability under the Securities
Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (h) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.


                                        4

<PAGE>   5

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Irvine, State of California, on February 9, 2001.


                                           Sionix Corporation

                                           By: /s/ James J. Houtz
                                               -----------------------------
                                                   James J. Houtz, President

     Each person whose signature appears below constitutes and appoints James J.
Houtz his attorney-in-fact and agent, with full power of substitution, for him
and in his name, place and stead, in any and all capacities, to sign any or all
amendments to this Registration Statement, and to file the same, with all
exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in- fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorney-in-fact and agent, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated:

<TABLE>
<CAPTION>

 Signature                                     Title                      Date
 ---------                                     -----                      ----
<S>                                  <C>                           <C>

(1) Principal Executive Officer

 /s/ James J. Houtz                  President and a Director      February 9, 2001
----------------------------
     James J. Houtz

(2) Principal Financial and
    Accounting Officer

 /s/ Robert E. McCray                Chief Financial Officer       February 9, 2001
----------------------------         and a Director
     Robert E. McCray

(3) Directors

/s/  Joan C. Horowitz                Secretary/Treasurer and a     February 9, 2001
----------------------------         Director
     Joan C. Horowitz
</TABLE>


                                        5

<PAGE>   6

                                  EXHIBIT INDEX

EXHIBIT
NUMBER                            DESCRIPTION
------                            -----------

   5.1         Opinion of Haddan & Zepfel LLP

  23.1         Consent of Cacciamatta Accountancy Corporation

  23.2         Consent of HJ & Associates

  24.2         Consent of Haddan & Zepfel LLP (included in Exhibit 5.1)
[{"type": "S-8", "sequence": "1", "filename": "a69089s8s-8.txt", "description": "FORM S-8", "secsgml_size_bytes": 14518}]
{"company-data": {"conformed-name": "SIONIX CORP /UT/", "cik": "0000764667", "assigned-sic": "3541", "irs-number": "870428526", "state-of-incorporation": "UT", "fiscal-year-end": "0930"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-55348", "film-number": "1531642"}, "business-address": {"street1": "9272 JERONIMO RD", "street2": "SUITE 108", "city": "IRVINE", "state": "CA", "zip": "92618", "phone": "9494549283"}, "mail-address": {"street1": "9272 JERONIMO RD", "street2": "SUITE 108", "city": "MISSION VIEJO", "state": "CA", "zip": "92618"}, "former-company": [{"former-conformed-name": "AUTOMATIC CONTROL CORP /NV", "date-changed": "19960422"}, {"former-conformed-name": "SIONIX CORP", "date-changed": "19960214"}, {"former-conformed-name": "CORONADO CAPITAL CORP", "date-changed": "19950111"}]}
1

    As filed with the Securities and Exchange Commission on February 9, 2001
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                               SIONIX CORPORATION
             (Exact name of registrant as specified in its charter)

            UTAH                                        87-0428526
(State or other jurisdiction of                      (I.R.S. Employer
incorporation or organization)                      Identification No.)

                               9272 JERONIMO ROAD
                                IRVINE, CA 92618
               (Address of Principal Executive Office) (Zip Code)

                              CONSULTING AGREEMENT
                            (Full title of the plan)

                                 JAMES J. HOUTZ
                               9272 JERONIMO ROAD
                                IRVINE, CA 92618
                     (Name and address of agent for service)

                                 (949) 454-9283
          (Telephone number, including area code, of agent for service)

                                    COPY TO:
                             ROBERT J. ZEPFEL, ESQ.
                               HADDAN & ZEPFEL LLP
                         4685 MACARTHUR COURT, SUITE 220
                             NEWPORT BEACH, CA 92660
                                 (949) 752-6100

                         CALCULATION OF REGISTRATION FEE
======================================================================================================
                                           Proposed Maximum      Proposed Maximum
Title of Securities         Amount to       Offering Price      Aggregate Offering       Amount of
to Be Registered          Be Registered      Per Share(1)            Price(1)         Registration Fee
------------------------------------------------------------------------------------------------------
Common Stock, without
  par value                  260,000             $.25                $65,000               $16.25
======================================================================================================
(1) Estimated solely for the purpose of calculating the amount of the
    registration fee pursuant to Rule 457, based on the closing price of the
    Common Stock, as reported by the OTC Bulletin Board, on January 29, 2001.

================================================================================
2

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

     The following document filed with the Securities and Exchange Commission
(the "Commission") pursuant to the Securities Exchange Act of 1934, as amended
(the "Exchange Act") by Sionix Corporation (the "Company") is hereby
incorporated by reference in this Registration Statement except as superseded or
modified herein: the Annual Report on Form 10-K for the year ended September 30,
2000, including any amendment or reports filed for the purpose of updating such
description. All documents filed by the Company with the Commission pursuant to
Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this
Registration Statement and prior to the time a post- effective amendment which
indicates that the securities offered hereby have been sold or which deregisters
all securities then remaining unsold, shall be deemed to be incorporated by
reference into this Registration Statement and to be a part hereof from the date
of filing of such documents. Any statement contained in any document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of this Registration Statement to the
extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as modified or superseded, to constitute
a part of this Registration Statement.

ITEM 4. DESCRIPTION OF SECURITIES

     Not applicable

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL

     Not applicable.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Under Section 16-10a-903 of the Utah Revised Business Corporation Act (the
"URBCA"), and the Company's Articles of Incorporation, the Company is required
to indemnify a director or officer who is successful, on the merits or
otherwise, in the defense of any proceeding, or in the defense of any claim,
issue, or matter in the proceeding, to which he was a party because he is or was
a director of the corporation, against reasonable expenses incurred by him in
connection with the proceeding or claim with respect to which he has been
successful. Pursuant to Section 16-10a-902 and subject to Section 16- 10a-906,
the Company may indemnify a director for reasonable expenses incurred in a
proceeding. The Company's Articles of Incorporation contain certain provisions
permitted under the Utah Revised Business Corporation Act, relating to the
liability of directors. These provisions eliminate the liability of a director
to the Company or to its shareholders for monetary damages for any action taken
or any failure to take any action, as a director, except liability for: (a) the
amount of a financial benefit received by a director to which he or she is not
entitled; (b) an intentional infliction of harm on the Company or the
shareholders; (c) a violation of Section 16-10a-842 (regarding unlawful
distributions); or (d) an intentional violation of criminal law. These
provisions do not limit or eliminate the rights of the Company or any
shareholder to seek non-monetary relief, such as an injunction or rescission, in
the event

                                       2
3

of a breach of a director's fiduciary duty. These provisions do not alter a
director's liability under federal securities laws. The Company's By-laws also
contains certain provisions permitted under the URBCA relating to
indemnification of directors and officers of the Company. In general, these
provisions permit the indemnification of directors and officers in certain
circumstances if the person seeking indemnification acted 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 Company, and with respect to any criminal action or proceeding,
had not reasonable cause to believe his or her conduct was unlawful. The
provisions also provide for the reimbursement and/or advancement of expenses to
directors and officers under certain circumstances, which provisions are
consistent with the URBCA. Insofar as indemnification for liabilities arising
under the Securities Act of 1933 may be permitted to directors, officers or
persons controlling the company pursuant to the foregoing provisions, the
Company has been informed that in the opinion of the securities and exchange
commission such indemnification is against public policy as expressed in the act
and is therefore unenforceable.

ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable

ITEM 8. EXHIBITS.

      5.1   Opinion of Haddan & Zepfel LLP

     23.1   Consent of Cacciamatta Accountancy Corporation

     23.2   Consent of HJ & Associates

     24.2   Consent of Haddan & Zepfel LLP (included in Exhibit 5.1)

ITEM 9. UNDERTAKINGS.

     The undersigned registrant hereby undertakes:

     (a)(1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement:

            (i) To include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933 (the "Securities Act");

            (ii) To reflect in the prospectus any facts or events arising after
the effective date of the registration statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represents a fundamental change in the information set forth in the registration
statement;

            (iii) To include any material information with respect to the plan
of distribution not previously disclosed in the registration statement or any
material change to such information in the registration statement.

                                       3
4

         Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed by the registrant
pursuant to Section 13 or Section 15(d) of the Exchange Act that are
incorporated by reference in the registration statement.

     (2) That, for the purpose of determining any liability under the Securities
Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (h) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.

                                        4
5

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Irvine, State of California, on February 9, 2001.

                                           Sionix Corporation

                                           By: /s/ James J. Houtz
                                               -----------------------------
                                                   James J. Houtz, President

     Each person whose signature appears below constitutes and appoints James J.
Houtz his attorney-in-fact and agent, with full power of substitution, for him
and in his name, place and stead, in any and all capacities, to sign any or all
amendments to this Registration Statement, and to file the same, with all
exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorney-in- fact and
agent full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorney-in-fact and agent, or his substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated:
Signature                                     Title                      Date
 ---------                                     -----                      ----
(1) Principal Executive Officer

 /s/ James J. Houtz                  President and a Director      February 9, 2001
----------------------------
     James J. Houtz

(2) Principal Financial and
    Accounting Officer

 /s/ Robert E. McCray                Chief Financial Officer       February 9, 2001
----------------------------         and a Director
     Robert E. McCray

(3) Directors

/s/  Joan C. Horowitz                Secretary/Treasurer and a     February 9, 2001
----------------------------         Director
     Joan C. Horowitz
5
6

                                  EXHIBIT INDEX

EXHIBIT
NUMBER                            DESCRIPTION
------                            -----------

   5.1         Opinion of Haddan & Zepfel LLP

  23.1         Consent of Cacciamatta Accountancy Corporation

  23.2         Consent of HJ & Associates

  24.2         Consent of Haddan & Zepfel LLP (included in Exhibit 5.1)