The APEC 3-stage specialized filtration system uses three (3) 20" BB specialty filters to effectively treat a wide variety of water concerns. This point-of-entry combo system can effectively filter out sediment, chemicals and iron to deliver cleaner more manageable water to every faucet for all your water needs. Uniquely designed for versatile use to meet all of your large capacity filtration needs. Suitable for simple whole house water filtration, light commercial use or industrial applications with a fast flow rate. Designed for water with light sediment, odor & staining concerns 3-In-One system effectively removes sediment, chemicals & iron Delivers clean, clear, odor-free water to every faucet 1st stage sediment filter reduces dirt, sand, silt & rust particles 2nd stage iron filter treats iron, iron staining & metallic taste 3rd stage carbon filter adsorbs chlorine, taste, odors & organics Versatile use suitable for residential, commercial & industrial usage Durable, highest quality 20" Big Blue filter housings No installation, pre-assembled complete system ready to mount