4-Pack Replacement WaterPur CCI10CLW12 Activated Carbon Block Filter - Universal 10 inch Filter for WaterPur CCI-10-CLW12 Water Filter Housing 4-Pack Replacement WaterPur CCI10CLW12 Activated Carbon Block Filter - Universal 10 inch Filter for WaterPur CCI-10-CLW12 Water Filter Housing Replacement WaterPur CCI10CLW12 Activated Carbon Block Filter, Quantity: 4 Replacement WaterPur CCI10CLW12 Activated Carbon Block Filter 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. Removes undesirable and possibly harmful waterborne contaminants, particles, chemicals and microorganism.