@
Mussels
nope, at least not for me, especially when biocides are involved.
took about 6 month until bio growth showed,using tap water with biocide (rad was used and dirty and i had planned for flush/prep later).
the only time i had a "galvanic reaction" was using deionized water with additive (dead water, after cleaning/flushing loop), showing corrosion within 2-3 month.
using distilled water + biocide was stable for over 1y (same amount of "dead water").
while true that its better than tap (short term), when filtered to the same nano size (for particles), deionized water will not be better than (just) the distilled version of it.
its made to add to other things (mainly fluids), e.g. when doing stuff in a lab, not to run as coolant.
the same way most arent using antifreeze, yet it works fine in cars..
ignoring that some exception are possible (only pure unplated copper used, etc), but thats not the norm.