KDF Fluid Treatment Inc.'s patented KDF® 55 Process Medium provides a highly effective means of removing water contaminants in POE or POU applications. KDF 55 Medium is a high-purity formulation of copper-zinc alloy specifically designed to remove or reduce chlorine and water-soluble heavy metals using redox, or oxidation-reduction. KDF 55 controls scale, bacteria and algae, even in hot water and can remove up to 99 percent of water-soluble lead, mercury, nickel, chromium and other dissolved metals.