Hybrid Activated Carbon Block Whole House Water Filter, KleenWater Watershed-4510 Chlorine Sediment Sulfur Replacement Cartridge, Solves High Demand Problems with Maximum Filtration Revolutionary design. Mixed media hybrid filter for chlorine, chemical, sulfur, cyst, sediment, suspended solids and rust filtration Extremely high dirt holding capacity and very resistant to clogging 1 Micron NSF rated for cyst reduction. High flow design ~ Low pressure drop Up to 80,000 gallons capacity. 4.5 x 9.75 inch