The Doulton W9220402 Slimline Sterasyl OBE Ceramic Candle fits slimline 10" filter housings and provides sub micron filtration of drinking water. The Doulton W9220402 is open on both ends (OBE), has the pore structure to remove fine particulates, bacteria, cysts, and turbidity. In addition, the ceramic shell is sliver impregnated to inhibit bacteria growth, making the filter self sterilizing. The Sterasyl OBE Ceramic Candle has a micron rating of 0.9, a flow rate of 1.33 gpm, and a 2600 gallon capacity. Use the Doulton 9120562 Sterasyl S 10" Ceramic Candle to remove turbidity, E.Coli, Cholera, Typhoid, Cryptosporidium, insecticides, herbicides, phenols, lead, and chlorine.