Feel confident with every sip that you are providing the best quality water for you and your family. The Moen 4-stage under-sink reverse osmosis advanced water filtration system reduces contaminants including arsenic, fluoride, TDS, bacteria, viruses, lead, mercury, chlorine, and pharmaceuticals in your cold water. The advanced reverse osmosis purification system with a Moen reverse osmosis-compatible sip drinking water faucet or 3-in-1 filtration pulldown faucet is available in many styles and finishes to meet your kitchen’s design aesthetic.