Culligan 06802002781 RFC-BBSA Whole House Premium Water Filter, 10,000 Gallons, 1 Pack, White The RFC-BBSA granular carbon 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 3 GPM and filter life of 6 months/10,000 gallons (depending on usage and water conditions) Reduces: sediment, rust, scale, dirt, coarse sand, sand, fine sand, extra fine sand, silt and aesthetic chlorine taste & odor 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 25 (the smaller the micron rating, the smaller size patricle the cartridge will filter) Compatible with Culligan model HD-950A