03-12-2009, 04:13 PM
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Provided that you add proper amt of additves (Ca, Mg,etc), distilled water is better than RO/DI. (Even RO/DI has to be dosed w/ addtives.
Distilled was is pure water where RO/DI still has some dissolved solids. For you nano, would use distilled Water rather than investing in RO/DI unless want to get one for household use. RO/Di is not cheap to buy and also not that cheap to run and properly miaintained.
Better RO/DI (produces less gallons/day) will watse more water than less effecient one (produces more gallon/day) and cost of replacement membrane, etc. arent cheap either, especially if your tap is very hard water (high mineral contents as in well water).