Fluid filtering and treating apparatus

Claim 1

A FLUID TREATMENT APPARATUS COMPRISING A SUBSTANTIALLY CYLINDRICAL SUMP HOUSING, A SUBSTANTIALLY CYLINDRICAL CARTRIDGE WITHIN SAID HOUSING COMPRISING CONCENTRICALLY POSITIONED INNER AND OUTER RIGID TUBULAR MEMBERS, A SUBSTANTIAL PORTION OF THE WALLS OF WHICH ARE PERFORATED AND WHICH DEFINE AN ANNULAR CHAMBER BETWEEN SAID TUBULAR MEMBERS AND AN AXIAL CHAMBER WITHIN THE INNER TUBULAR MEMBER, A FLEXIBLE AND ELASTIC FILTERING WRAPPER AGAINST AND ABOUT THE OUTER SURFACE OF AT LEAST THE OUTER OF SAID TUBULAR MEMBERS, AND MEANS ASSOCIATED WITH SAID HOUSING AND SAID CARTRIDGE FOR CAUSING A FLUID FLOW TO ENTER SAID HOUSING EXTERIORLY OF SAID OUTER TUBULAR MEMBER AND TO PASS THROUGH SAID WRAPPER, SAID TUBULAR MEMBERS AND SAID CHAMBERS BEFORE DEPARTING THEREFROM WHEREIN THE PERFORATIONS IN AT LEAST THE OUTER OF SAID TUBULAR MEMBERS ARE AT LEAST WITHIN THE RANGE OF FROM .20 TO .50 INCH IN THE SMALLER OF THEIR TRANSVERSE DIMENSIONS AND THE MARGINS OF THE PERFORATIONS OPENING UPON THE TUBULAR WALL ABOUT WHICH THE FILTERING WRAPPER IS APPLIED ARE SHAPRLY DEFINED WHEREBY THE INTERMITTENT STARTING AND STOPPING OF THE FLUID FLOW ENTERING SAID HOUSING WILL CAUSE THE SEDIMENTATIOUS MATERIAL ACCUMULATING UPON SAID WRAPPER TO BE LOOSENED AND FLECKED FREE THEREOF IN A SELF-CLEANING MANNER.