Ampac Water Saving 5 Stage 75 GPD Reverse Osmosis System with Tank, Chrome Faucet & Installation Kit (GRO-5) High Efficiency 5 stage treatment for clean fresh drinking water Low drain flow, uses 2 gallons tap water to make 1 gallon RO water (up to 300% more efficent) Pressure tank at 3.2 gallons included Simple installation, Ampac kit includes faucet, fittings and tubing Use for drinking water and for icemakers