The FPMB-BB5-20 Melt-Blown Polypropylene sediment filter effectively reduces fine sediment such as sand, silt, dirt and rust particles in residential and commercial drinking water. Low cost makes it excellent for pre-filtration. High dirt-holding capacity means fewer filter changes. High chemical resistance for a wide range of uses. The FPMB5-20 Melt-Blown Polypropylene sediment filter fits most 20" Big Blue filter housings.