Waterdrop RO water filter system adopts advanced composite filter technology. The composite filter can intercept most harmful contaminants. (1) TDS, chlorine, taste and odor, chloramine, scale, turbidity. (2) Carcinogens: chromium (hexavalent), chromium (trivalent), cadmium and cadmium compounds, ferric oxide. (3) Heavy metals: lead, mercury, barium, copper, radium 226/228, aluminum. (4) Micro organic contaminants: cysts. (5) Inorganic pollutants: arsenic and inorganic arsenic compounds, fluoride. (6) Organic pollutants: asbestos, benzene, formaldehyde, trichloromethane, chlordane, PFOA & PFOS, etc.