AquaFx Reverse Osmosis DI units are the only brand that we carry here at ClickCorals. They have been mastering water treatment for nearly 50 years. All of their units are built right here in the USA, so you know you're getting a quality company that will stand behind their product. The majority of their replacement filters are pretty moderately priced as well. With a remarkable 3 year warranty, it's no wonder why they stay at the top of the water filtration industry.
RO/DI Units are a necessity for any aquarium owner. The water that comes out of our faucets is most of the time loaded with heavy metals and other chemicals. Even in small amounts, it can still be harmful to creatures that are used to living on coral reefs. If you are going to own a saltwater aquarium your very first purchase should be an RO/DI unit. Make sure you take care of your tank inhabitants so they offer you years of happiness.