SHOWER FILTER WITH REVERSIBLE DUAL-CHAMBER: Hotel Spa universal high-performance shower filter comes with a reversible dual-chamber KDF/GAC cartridge. KDF is a top-quality shower filter because it can help reduce chlorine, heavy metals and harmful impurities. ULTIMATE FILTRATION TECHNOLOGY: Using KDF in our showerhead filters reduces lime and scale build-up, keeping your showerhead nozzles and bathroom fixtures cleaner than ever! As the water passed from KDF into the GAC (active carbon) chamber, it goes through the second filtration stage of carbon absorption for additional cleaning and disinfection. SUITABLE FOR ANY SHOWER HEAD: Universal high-performance shower filter replacement cartridge can be easily used with every Hotel Spa shower heads for an ultimate shower experience. After you first shower with this double-purified water, you will notice an immediate improvement in the condition of your skin, hair and nails! NO TOOL, EASY INSTALLATION: No need to hire a handyman! Hotel