EXHIBIT C JOINT FILING AGREEMENT

                                                             Page 20 of 68 Pages

                                    EXHIBIT C

                             JOINT FILING AGREEMENT

               The  undersigned  hereby agree that the statement on Schedule 13D
with respect to the Common Stock of T/F Purifiner,  Inc. dated June 30, 1997 is,
and any amendments  thereto signed by each of the undersigned shall be, filed on
behalf of each of us pursuant to and in accordance  with the  provisions of Rule
13d- 1(f) under the Securities Exchange Act of 1934.

Date:  June 30, 1997

                                             QUANTUM INDUSTRIAL PARTNERS LDC
                                             
                                             By:  /S/ XXXXXXX X. XXXX
                                                  -----------------------------
                                                  Xxxxxxx X. Xxxx
                                                  Attorney-in-Fact


                                             QIH MANAGEMENT INVESTOR, L.P.

                                             By:  QIH Management, Inc.,
                                                  its General Partner

                                                  By:  /S/ XXXXXXX X. XXXX
                                                       ------------------------
                                                       Xxxxxxx X. Xxxx
                                                       Vice President


                                             QIH MANAGEMENT, INC.

                                             By:  /S/ XXXXXXX X. XXXX
                                                  -----------------------------
                                                  Xxxxxxx X. Xxxx
                                                  Vice President


                                             XXXXX FUND MANAGEMENT LLC

                                             By:  /S/ XXXXXXX X. XXXX
                                                  -----------------------------
                                                  Xxxxxxx X. Xxxx
                                                  Assistant General Counsel







                                                             Page 21 of 68 Pages


                                             XXXXXX XXXXX

                                             By:  /S/ XXXXXXX X. XXXX
                                                  -----------------------------
                                                  Xxxxxxx X. Xxxx
                                                  Attorney-in-Fact


                                             XXXXXXX X. XXXXXXXXXXXXX

                                             By:  /S/ XXXXXXX X. XXXX
                                                  -----------------------------
                                                  Xxxxxxx X. Xxxx
                                                  Attorney-in-Fact