CP5BBS replacement filter cartridge reduces sediment, coarse sand, sand, fine sand, extra fine sand, dirt, silt, rust, and scale particles. 5 microns (nominal) filtration. Pleated polyester and cellulose fiber blend construction, high flow rate/low pressure drop capabilities. High dirt holding capacity. Filter life up to 3 months or 12,000 gallon. Use with Model No. HD-950A (SKU 432660) filter.