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Reverse osmosis water is essentially free from chlorine, nitrates, phosphates and heavy metals and is an ideal base for making up salt solutions or for freshwater aquariums or replacement of evaporated loss.
Tap water is generally full of these pollutants and the effect on your aquarium can be quite severe depending on how bad the water is in your particular area, fueling algae and diatom blooms which must be then maintained by chemical methods.
As Reverse Osmosis units are only 98% efficient in removing unwanted compounds from your mains water some people like to remove this last amount using deionised resin.
That's where the D&D 1 Litre DI Resin comes into use.