Other Dechlorination Methods
Another medium that is now being used successfully for dechlorination is the high-pure dissimilar metal (copper-zinc) alloy medium (sold under the trade name KDF -55). This unique product is used either in replaceable cartridge form or in loose medium bed, type units. It is also employed in combination with activated carbons. These combine carbon-dissimilar metal media beds appear to possess some synergistic characteristics. One property of this metallic medium is its extreme density. It needs at least 15 to25 gpm flow for proper backwashing and bed expansion. It is the high specific gravity of this product-which creates so much resistance against the flow in backwashing---that needs to be overcome.