The Doulton W9121750 SuperSterasyl 10" Gravity Ceramic Candle is designed for use in gravity filter systems such as CeraGrav LP5, Royal Berkey, Imperial Berkey, Crown Berkey, and Berkey Light. With a cartridge filter length of 10?, the Doulton W9121750 SuperSterasyl features a short 1 1/4" thread mount and provides sub micron filtration of drinking water. It comes with pore structure to remove fine particulates, bacteria, cysts, and turbidity. The ceramic shell comes with granular activated carbon. It is also silver impregnated to inhibit bacteria growth, making the filter self sterilizing. The SuperSterasyl 10" Gravity Ceramic Candle has a micron rating of 0.9, a flow rate of 1.2 gpm, and a 700 gallon capacity.