The Zero Waste Reverse Osmosis Retrofit Kit is a great way to convert your existing Reverse Osmosis system into an efficient water saving device. By adding this kit to your existing RO system, you can save hundreds of gallons of water every year. The system works by redirecting the rinse water. This kit pumps the rinse water into the hot water side of your water supply instead of down the drain. With the use of the supplied 24 volt pump, your hot water supply will accept the rinse water and mix with the hot water. This process can be done because when you use your hot water under normal circumstances, the water coming from your hot water side is not used for cooking or drinking. Also by adding this kit to your existing RO system, you will be able to increase the membrane production and fill the storage tank faster.