Phylex
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I'm guessing you're using tap water for all your mixes. You keep them on hand sitting like that without an air stone, and for how long? I was under the impression water sitting without an air stone raises the level of chloramine. I've been strongly advised not to let the water sit without air stones for more than a day because of this. (hydro store advise) But I've seen plenty of your grows and you don't seem to have issues. So it's obviously working for you without ill effect. I'm also guessing you recheck the PH before application. I have had a mix sit for a few days and the PH climbed over that time when I rechecked it.