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The Beneficials create oxolate and other organic acids which reduce the solubility of the salts themselves. This causes them to precipitate from the effective solution and cease damaging the roots.Has to be 5%v/v, which is extremely high. So high that your plants would die before the bennies would.
The issue with applying bennies to hydro only, or using salts only I should say... is the lack of carbons for a foodsource. That's why adding a little molasses is helpful. If you apply only salt based fertilizers to soil, the microbes will break down all the organic matter, eat all the carbon, and then starve to death. At least that's what I have read.