KDF 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. For every pound of KDF-55 media, you should be able to receive 15,000 gallons of chlorine removal. Recommended Operating Conditions: Service flow (10" bed depth) 15 gpm/ft2 Backwash for 10 min @ twice the service flow Purge/rinse for 3 min @ twice the service flow Bed expansion, backwash 10 to 15% Free board 20% Min. bed depth (6" dia) 10" PH range: drinking water 6.5 to 8.5 Water temperature, influent 35°F to 212°F