Feel confident with every sip that you are providing the best quality water for you and your family. The Aquifer reverse osmosis (RO) water filtration system effectively reduces contaminants including arsenic, fluoride, TDS, bacteria, viruses, lead, mercury, chlorine, and pharmaceuticals in your cold water. This RO membrane reduces arsenic, fluoride, lead, TDS, bacteria, viruses, and more as part of the Aquifer RO four-stage purification system.