iSpring WU301 19200 GPD 0.1 Micron 3 Years Ultrafiltration Water Filter System 0.1 micron ultrafiltration removes thinnest particles in water including virus and bacteria Same technology used in personal water filters and medical facilities to produce safe drinkable water 19,200Gpd or 12 gallons per min volume with little pressure loss. Back flushable up to 3 years, ideal for whole house and commercial use