Culligan CW5-BBS Filter Cartridge, 5 Micron, White The CW5-BBS polypropylene wound heavy duty filtration cartridge works in Culligan model HD-950A whole house filtration systems Perfect for residential homes, helps protect appliances and pluming from sediment and scale Features a flow rate of 8 GPM and filter life of 4 months/16,000 gallons (depending on usage and water conditions) Reduces: sediment, rust, scale, dirt, coarse sand, sand, fine sand, extra fine sand and silt The HD-950A housing has been tested and certified by WQA against NSF/ANSI Standard 42 for materials saferty and structural integrity Micron rating of 5 (the smaller the micron rating, the smaller size patricle the cartridge will filter) Compatible with Culligan model HD-950A 5 Micron heavy duty sediment filter cartridge Polypropylene wound, more effective on well water Cartridge life of 4 months, 16,000-Gallons Reduces sediment, scale, rust, dirt, coarse sand, sand, fine sand, extra fine sand, silt Extra whole house filtration of very fine sediment particles