D&D Reverse osmosis unit
D&D Reverse osmosis units are of very good quality. Reverse osmosis water is essentially free of chlorine, nitrates, phosphates and heavy metals. It is ideal for making seawater and for supplementing evaporated aquarium water. Tap water is generally full of these contaminants and the effect on the aquarium can be very serious, depending on how the water is in the environment. If tap water is used for the aquarium, this can lead to algae and diatom problems, which must then be combated with other methods.