From our perspective, there is no practical difference between RO/DI and distilled, but exactly what impurities may remain vary a bit. For example, atmospheric gases like O2, CO2, N2, etc, may be different. Certain impurities in the starting water can also get through distillation and RO/DI, but how much depends on what might have been there.
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Randy Holmes-Farley
Current Tank Info: 120 mixed reef
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