Reinforced filter with replaceable cartridge

Claim 1

A FILTER FOR FILTERING UNWANTED PARTICLES FROM LIQUID AS THE LIQUID FLOWS THERETHROUGH, WHICH FILTER COMPRISES: (A) A HOLLOW CASING HAVING A TOP AND BOTTOM WALL, (1) SAID HOLLOW CASING HAVING AN INLET OPENING FORMED BY A PIPE COUPLING SECURED THEREIN, (2) SAID HOLLOW CASING HAVING AN OUTLET OPENING FORMED BY A PIPE COUPLING SECURED TO SAID TOP WALL, (B) A PIPE EXTENDING FROM SAID OUTLET COUPLING INTO SAID CASING, WHICH PIPE HAS A CLOSED INNER END SECURED TO SAID BOTTOM WALL, (1) SAID PIPE HAVING LATERAL OPENINGS FORMED THEREIN FOR A PORTION OF THE LENGTH THEREOF INTERMEDIATE THE LENGTH OF SAID PIPE, (C) A FILTER MASS SURROUNDING SAID PIPE AND HAVING A CORRUGATED INNER HOLLOW PORTION RECEIVING SAID LATERAL OPENINGS WITHIN THE LENGTH THEREOF AND A CORRUGATED OUTER PORTION, (1) SAID FILTER COMPRISING A MIXTURE OF SAND, FIBERGLASS, BONDED TOGETHER BY EPOXY RESIN SO AS TO FORM A RIGID PERMEABLE MASS HAVING VOIDS BETWEEN THE INDIVIDUAL SAND PARTICLES FOR THE FLOW OF LIQUID THERETHROUGH, (D) THE WALL THICKNESS OF SAID FILTER MASS BEING APPROXIMATELY UNIFORM.