This high capacity lead reduction filter is designed to fit the Pure H2O model number H2O-DWCFL100 under counter water filtration system. With a 1.5 GPM flow rate, the H2O-DWCFL100 system is certified to reduce lead, cyst, chlorine, taste, odor, sand, silt, dirt and rust. This replacement filter is designed for easy and quick filter replacement with just a quarter turn. For best results, it should be changed every 4,000 gallons or 6 months.