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I would look at the trichomes with a jewelers loop or a handheld microscope. Below is an example I took checking my plants last week.

Sorry took so long to reply. I use for final flush 1.5g / gal MKP, .8ml / gal fulvic. for normal planting, I use .5 g / gal on veg 1g/gal flower

I use Mono Potassium Phosphate (MKP) to stabilize my water. I use it during flower anyhow, and it works for me. But I use tap. RO was a waste.