Patent ID: 8753510

Claim:
A fluid filtering apparatus comprising: (a) a vessel having a generally cylindrical wall configuration with an annular sealing surface formed about the cylindrical wall defining a fluid pressure chamber having an inlet and outlet; (b) a primary filter bag disposed in the pressure chamber and having an open end thereof disposed for communicating exclusively with the inlet; (c) a first rigid porous container disposed about the primary filter bag, wherein all flow through the primary filter bag flows through the first rigid porous container; (d) a secondary filter bag disposed about said first rigid porous container and having an open end thereof sealed about the first rigid porous container such that all flow exiting the primary filter bag flows through the secondary filter bag before entering the outlet; and, (e) a second rigid porous container disposed about the secondary filter bag, wherein all flow through the secondary filter bag flows through the second rigid porous container, wherein an open end of the second rigid porous container is sealed about the annular sealing surface and the open end of the primary filter bag is sealed about an open end of the first rigid porous container, and wherein the first rigid porous container has an open end sealed about the open end of the secondary filter bag.