4-Pack Replacement WaterPur CCI-10-CLW Activated Carbon Block Filter - Universal 10 inch Filter for WaterPur Clear Water Filter Housing 4-Pack Replacement WaterPur CCI-10-CLW Activated Carbon Block Filter - Universal 10 inch Filter for WaterPur Clear Water Filter Housing Replacement WaterPur CCI-10-CLW Activated Carbon Block Filter, Quantity: 4 Replacement WaterPur CCI-10-CLW Activated Carbon Block Filter by CFS NSF certified, coconut shell carbon, universal 10 inch activated carbon block filter. Improves taste and clarity while retaining beneficial nutrients by reducing chlorine, fine sediment, odor, silt, rust.