KDf is a kind of com pound of brass and zinc partricles,it can exchange electron oxidation mode to treat pollutionsource in water.Because brass and zinc are constantlyexchange electron oxidation deoxidation.The ma in treatment object of KDf is heavy metal impurity and organic pollution source in water. Combiningwith reverse osmosis system,it can effectively prolong the service life ofRO membrance.kDfcan remove 10%chlorine before water reached actiated Carbon effectively remove other impurities . As far astechnology is comcerned KDf can effectivelyprolongservice life ofactivated carbon 15times.At the same time, KDF also has antibacterial effect.