Waterdrop CoreRO Countertop Reverse Osmosis System, Instant Hot Water Dispenser, 5 Temperature Options, 5-Stage Filtration, NSF/ANSI 372 Certified, 3:1 Pure to Drain, No Installation, WD-C1H with an additional WD-C1RF Filter. 5-stage RO Filtration: Certified for safety with NSF/ANSI 372 lead-free material standard and SGS-tested, this CoreRO system uses premium 0.0001μm RO membrane to reduce TDS, PFOA, PFOS, chlorine, fluoride, arsenic, lead and more, providing you healthy water.3s instant Heating: Revolutionize your life with the countertop reverse osmosis system, featuring cutting-edge heating technology for 3-second instant heat. Effortlessly perfect for soothing tea, refreshing coffee, and more, its convenience redefined.