Patent ID: 7441665

Claim:
A gravity fed water purification cartridge, comprising: an inlet head cap configured to be coupled to a prefilter, wherein said inlet head cap provides an inlet for untreated water; a ring member in fluid flow communication with the inlet head cap, wherein said ring member is configured to evenly distribute the untreated water to a purification medium; a purifier vessel in fluid flow communication with the ring member, wherein said purifier vessel contains a polymer having pendant hydantoin groups to treat said untreated water and provide treated water; a bulkhead coupled to the inlet head cap and configured to separate the untreated water from treated water; a dwell chamber coupled to the bulkhead, wherein said dwell chamber provides residence time for treatment of the treated water with residual halogen, and wherein the dwell chamber is in fluid flow communication with the purifier vessel; and an outer skin coupled to the bulkhead and enclosing the dwell chamber, wherein said outer skin and dwell chamber provide an annular space therebetween, and wherein said outer skin is configured to discharge said treated water.