All ShowerFilterStore.com shower and bath filters utilize KDF™ tecnology as the filtration media. KDF™ is a compound of granulated copper and zinc that removes chlorine, iron oxides, hydrogen sulfide, and traces of heavy metals. It is a bacteriostatic media that inhibits the growth of E. coli, mold, and other bacteria. KDF™, in the presence of hot water, literally becomes catalyzed to perform more efficiently, therefore it is the most efficient, state-of-the-art technology for shower and bath filtration.