Go with powdered nutes....
.....Megacrop has everything you need. Or, even better is jacks 3-2-1...look it up and study...GL
Edit: I'd have a bottle of Cal-Mag on hand, and some plain epson salt just incase- some strains/environments need them
My harvest is best with no flushing......been there- tired that- tested it personally.
My opinion is...if you have to flush, you're doing something wrong.
I use hydroguard in dwc. Its proven. also not running chillers either, no probs yet 2yrs. Yes it's mostly water but for home growers its really not that expensive to use and it is easy and ready to use. Shit works great. Imho. Peace
ive actually been wondering if i cant just add disilled...