High capacity: 400 GPD. Premium RO membrane provides longer filter life than most RO membranes on the market. With its 1st-stage 3-in-1 composite Sediment and Carbon Block filter and 2nd-stage advanced RO Membrane, RO400W1 effectively removes TDS, limescale, up to 99% of over 1,000 contaminants, including lead (removes up to 98%), chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more. 3rd stage Carbon Block Filter further enhances the taste of the filtered water. Enjoy all the benefits of drinking clean and healthy water. 2:1 Pure water to waste water ratio: More pure water generated than water water. Energy efficient and cost effective. Sleek tankless design saves more under-sink space than traditional RO water filtration systems. Dynamic LED display shows real-time filter usage status. Built-in TDS indicator helps you monitor water quality 24/7. Thanks to its reinforced integrated water route design, leak-free DIY installation and filter change are greatly simplified, much easier, and truly time-saving.