Universal KDF-55/Activated Carbon Shower filter Dual stage KDF-55 / Activated Carbon GAC shower head filter Reduces 98% of water soluble heavy metals such Reduces 95-98% of chlorine/chloramine. KDF process media are completely safe so the process is not t Low cost of replacement cartridge - only $15.99. Last for 8-12 months. Shower Filter will typically last 7000 gallons or 8-12 months. Comes with one replaceabl cartridge