Aqua-Pure AP-DW85 Full Flow Drinking Water System Replacement Cartridge, Easy Change Water Filter Reduces microscopic particles as small as 0.5 microns for clearer water Twist-on cartridge design makes changeouts quick, easy, and no-mess Helps ensure you have cleaner, clearer water Helps protect plumbing and fixtures from particulate build-up Capacity of 1500 gallons reduces need for cartridge changes