Watts Premier 201007 Big Blue GAC Radial Flow Green Carbon Filter Effectively reduces sand, silt, sediment, rust, chloramines, chlorine taste and odor Designed to allow maximum contact between the water and the carbon ensuring optimal reduction capabilities with reduced pressure drop 20 micron GAC filter Part of the Watts Premier green line of premium coconut shell carbon filters Compatible with Watts 213089 and 213057 housings, as well as other whole-house filter housings that accept 9.5 by 4.5-Inch filters