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RO provides the best way to produce ultra pure water (pure H2O).
It has long been the choice for marine specialists but is now becoming more used in teh main stream fresh water hobby.
It is easy to overlook the need for electrolytes; mineral cations such as calcium & magnesium and the effect of KH (Carbonate hardness) in the aquatic environment.
Minerals such calcium are essential for osmotic function in fish and many aquarists make the mistake of believing that some fish such as Discus do not require Calcium or minerals when in reality (based on many studies in biochemistry) these mineral cations are essential and GH test kits to not give the full picture .