RO/DI stands for Reverse Osmosis and Deionization. The product is a multi-stage water filter, which takes ordinary tap water in and produces highly purified water.
A RO/DI filter removes most impurities in the tap water, such as phosphates, nitrates, chlorine, and various heavy metals. It generates pure water for Drinking and/or supplies your Aquarium tank reducing algae blooms to grow and make perfect salt water. Make pure water at home... no more bottled water! Save more and more money... You must get one!