20-Stage Filtration - Water passes through 20 distinct filters to remove chlorine and heavy metals. This filtering process allows only the cleanest and purest pH balanced water to flow from the shower head water filter.Health Care - Our shower head filter replacement has 20 stages of filtration, which can effectively reduces chlorine, heavy metals, fluoride, and protects you from itchy skin, flaky dandruff, eczema, bone-dry hair and brittle nails.Package - 4 shower filter replacement cartridge will provide up to 16 months~2 years of filtration for your showers hard water.Universal Compatiblity - Compatible with various shower filter systems, Compatible with AquaBliss Shower Filter Series (SF100, SF220), Compatible with AquaHomeGroup Filtered Shower Head, Compatible with iSpring SF Series (SF1S, SF2S, SF3S, SF4S), Compatible with FEELSO Shower Head, Compatible with ProOne Promax Shower, Compatible with ProPur Promax Shower, and more.Easy to Install - No tool is needed, just tighten shower filter cartridge by your hand in one minutes. Please change the cartridge every 4~6 months once the water pressure gets low.