Patent ID: 7727394

Claim:
A filter system comprising: a plurality of filter housings, each filter housing defining a housing cavity; a plurality of filter cartridges received within the plurality of housing cavities, said filter cartridges defining an elongate permeate passageway, said permeate passageway being in fluid communication with a permeate manifold; a plurality of spiral guides extending around an outer filter cartridge surface, wherein each said spiral guide imparts secondary flow across said outer filter surface and perpendicular to a fluid flowing through said spiral guides; and a concentrate manifold being in fluid communication with said spiral guides, said concentrate manifold receiving concentrate passing through said spiral guides, wherein said permeate manifold and said concentrate manifold each include elongated, generally cylindrical cavities, and wherein said permeate manifold and said concentrate manifold are generally parallel to each other and are generally concentrically aligned.