iSpring RCS5T 500 GPD High Flow Residential and Light Commercial Tankless Reverse Osmosis Water Filter System with 1:1 Drain Ratio Designed to supply on demand drinking water filtration for large families, small restaurants and small businesses Produces up to 500 gpd or 0.34 gpm under ideal conditions. The actual output could vary from 70% to 90% of the 500Gpd due to temperature, water chemical properties, and other factors. Clean water output is about 10-15 psi on average. Patented dual-flow ro membrane offers consistent output flow with an exceptional 1: 1 drain ratio 5 stages of filtration remove up to 99% of 1, 000+ pollutants including chlorine, fluoride, lead, arsenic, pesticides, pathogens, sulfur, thms, pfoa and pfos Light commercial capable - add a storage tank to increase the flow and provide continuous and stable supply of pure water for light commercial settings