KDF Process Media are high purity copper-zinc granules that reduce contaminants in water using oxidation/reduction (redox) reaction. KDF 85 process medium is an effective iron hydrogen sulfide 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 iron, hydrogen sulfide and control microorganisms in potable water without the use of chemicals. What's more, KDF 85 is highly efficient and tank size requirements are modest for more economical system engineering and installation. For every pound of KDF-85 media, you should be able to receive 10,000 gallons of chlorine removal.