Check the listing for details. KDF 55 Filter Media Specialized for Chlorine and Heavy Metal Removal (5 Lbs.). Color: Gold, Condition: New. Listed at 79.99 USD. (5 LBS.)KDF 55 Filter Media Specialized for Chlorine and Heavy Metal RemovalKDF Process Media are high purity copper-zinc granules that reduce contaminants in water using oxidation/reduction (redox) reaction. KDF 55 process medium is an effective chlorine removal agent used in point-of-entry (POE) treatment of municipal water supplies. These unique, innovative and environmentally responsible media consist of high purity copper-zinc granules that use redox (the exchange of electrons) in patented products to effectively reduce/remove chlorine, heavy metals, and control microorganisms in potable water without the use of chemicals. What's more, KDF 55 is highly efficient and tank size requirements are modest for more economical system engineering and installation.