I always use DW at the start of the grow, till they have a few sets of strong, healthy leaves. Then I switch to bubbled tap and teas. I've had varying pH in every single bottle of distilled water that I've bought. Don't know about EC. (I just got an EC meter, now I just need to see if I can find a reason to use it...)
I use tap after they're going good for two reasons:
1, it's cheaper, and 2, minerals that aren't found in DW. :smokebuds:
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