Removes up to 99% of pollutants for safety and reliability. Fits any regular 4.5 in. Three-stage whole house system. Offers a filtration life of up to 100,000 gal for versatile use. Make your water safer with this Pro+Aqua whole house heavy metals well water filter replacement set. It eliminates up to 99% of contaminants from up to 100,000 gallons of water, including chlorine, lead, mercury and other metals. For versatility, it provides a filtration life of up to 100,000 gallons. Removes up to 99% of chlorine, water-soluble lead, mercury, nickel, chromium and other dissolved metals. Original filters for PRO-100-E three-stage whole house, heavy metals well water filtration system. Upgrade any standard 4.5 in. Three-stage whole house system to an iron sulfur and heavy metals filtration unit. Filtration life of up to 100,000 gal. Safe water as soon as you install and flush the filters.