7100643 - 0.5 Micron Replacement Filter Cartridge for PWDWHCUC1 High Capacity Carbon FiltratioWatts 7100643 0. 5 Micron Replacement Filter Cartridge for PWCBHCUC1 Series This replacement high capacity coconut shell carbon block 0. 5 micron cartridge, reduces parasitic cyst, sedinment, chlorine taste and odors. It has a high flow rate of 1. 6 gpm and filters up to 10,000 gallons or replace annually. Features High capacity carbon block 0. 5 micron cartridge 1 4 turn quick change sanitary filter replacement High flow rate 1. 6 GPM Specifications