... zinc, manganese, selenium, iron, chromium, aluminum, nickel and copper, as well as to suppress the growth of bacteria and algae. Stage ... insecticides, bleaching agent, phenols, trihalomethanes and other carcinogenic substances as well as odor, foreign color and residual chlorine.Stage 4: The ... salmonella, etc.), parasites and microbes up to 99%.(rwater purifier,water softener,water purifying equipment)