Cost Effective: When you purchase this set of hard water filter for shower head cartridges, you will receive a four pack. This set of shower filter replacement cartridges will provide up to 8 months of filtration for your showers hard water.Multi-Stage Filtration: These shower filters to remove chlorine and heavy metals have 15 distinct filters water passes through. This filtering process allows only the cleanest and purest pH balanced water to flow from the shower head water filter.Compatible With Various Shower Filter Systems: 4 Pack 15 Stage Shower Filter Replacement Cartridge is compatible with various shower filter systems, including the AquaBliss Shower Filter Series (SF100, SF220), AquaHomeGroup Filtered Shower Head, iSpring SF Series (SF1S, SF2S, SF3S, SF4S), FEELSO Shower Head, and more.Gentle Cleansing: The shower head water softener attachment from will give you the ability to enjoy a relaxing shower that will actually get you clean. Our hard water filter for shower head helps to eliminate impurities that cause harm.Tool-Free Installation: When its time to replace your shower head water filter cartridge, there will be no need to drag out the toolbox. Our water filter for shower replacement is an easy task to accomplish and requires no tools.Long Lasting: Each of our shower head water softener attachment cartridges is designed to filter our impurities and toxins from your shower water for a period of time. Every filter cartridge will provide filtered water for up to 2 months.