These cleanable filter elements are designed to remove suspended solids and pathogenic bacteria. The ceramic shell composition and manufacture have been delicately balanced to control flow rate, the maximum pore size and element hardness. The ceramic contains a specially formulated self-sterilizing silver compound and, therefore, the Sterasyl element does not require sterilization after cleaning. Features: Removes Bacteria, Cryptospordium Giardia Removes Dirt, Rust Sediment