This 50 Gallons 5-stage Reverse Osmosis Drinking Water System is made from best martial to offer fresh, clean, and safe filtered water in your home. It protects you from the harmful effects of lead, heavy metals, chlorine, chemical contaminants. You and your family will have years of enjoyment and good health with it. Extra Filters:3 x Polypropylene Sediment Filter, 2 x GAC Activated Carbon, 2 x CTO Coconut Shell Carbon BlockFilter,1 x InlineT33 GAC Coconut Shell Carbon Filter. ***Water Storage Tank: NSF approved!