The two (2) 4.5"X 20" BB specialty filters can effectively treat a variety of water concerns. This filter combo can effectively filter out sediment, chemicals and chlorine to deliver clean and safe water to all of your water faucets. Uniquely designed for versatile use to meet all of your large capacity water filtration needs. Suitable for all 20" BB whole house housing, simple whole house filtration, light commercial use or industrial applications. 2-In-1 replacement filter combo designed to effectively remove sediment & chlorine Delivers clean, clear, odor-free water throughout every faucet 1st stage reusable sediment filter reduces dirt, sand, silt & rust particles 2nd stage carbon filter adsorbs chlorine, taste, odor & organic compounds (VOCs) Versatile use suitable for residential, commercial & industrial usage