The Doulton W9121200 SuperSterasyl 7" Gravity Ceramic Candle is designed for use in gravity filter systems. It has a dimension of 12? x 9.5? x 2.6?. The Doulton W9121200 SuperSterasyl features a long 1 3/4" thread mount and provides sub micron filtration of drinking water. It is equipped with the pore structure to remove fine particulates, bacteria, cysts, and turbidity. Its ceramic shell is sliver impregnated to inhibit bacteria growth, making the filter self sterilizing and re-cleanable. It has a micron rating of 0.9, a flow rate of 1.2 gpm, and a 535 gallon capacity. The Doulton W9121200 SuperSterasyl 7" Gravity Ceramic Candle removes turbidity, E.Coli, Cholera, Typhoid, Cryptosporidium, and chlorine.