Nano-metal clusters media (NMC) invented by Dr. Xiaorong Huang is a novel water purification media which made from millions of nano-metal clusters on porous inorganic material, and its specific surface and porosity is more than 100 times of KDF media's. NMC formed in innumerous micro primary cells has a very strong redox (reduction- oxidation) ability to reduce the heavy metal ions of Pb2+, Cd2+, Cr6+, As3+, residual chlorine into insoluble metal and Cl-, and to oxidize organics in water into harmless components. The growth and breeding of bacteria and virus are inhibited and eliminated because of shifting of oxidation/reduction potential. NMC media is a very high efficient water purification media over activated carbon and KDF media.