The ZeroWaste Reverse Osmosis System provides the compact design of the RO Pure Plus System combined with the patented water conservation performance of the ZeroWaste Unit, which redirects water that would normally be sent to the drain into your hot water connection where it is re-used. It consists of four separate filtration stages to provide you with clean, delicious tasting water. This kit includes one RO Pure Plus Reverse Osmosis Module with four pre-installed filters, 3 gallon storage tank, and a faucet with parts. It is important that this system is properly installed and maintained with an incoming water pressure of 40 to 80 psi for it to operate as designed. Four stages of filtration trap particulate matter and ensure a greater reduction of chlorine and other materials that cause bad taste and odors. This kit contains everything you need to maintain crystal clear, high quality, and great tasting water. Please note this kit has an operating temperature of 40°F (4.4°C).