Culligan RFC-BBS Level 4 Premium Heavy-Duty Sediment Replacement Cartridge: * Replacement cartridge fits the HD-950A * Reduces: sediment, rust, scale, dirt, coarse sand, sand, fine sand, silt, bad taste, aesthetic chlorine taste and odor * 25 micron radial flow granular carbon cartridge * Cartridge life is up to 6 months or 10,000 gallons * Recommended for use with city and well water supplies * Cartridge change reminder sticker included * Model# RFC-BBSA * Heavy duty sediment and drinking water replacement cartridge * Premium filtration of very fine sediment particles * Better water. Pure and simple.