Dang it....
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Randy thanks so much! I posted a question in my answer but probably didn't see it. I am at the bottom of one of my bottles and notices the nitrates rising again, do certain bacteria feed off each (ethonol and acid) ? wondering if the evaporation caused the nopx working less effectively because the mixture changed?
Ok I get that, I am not a chemist but my understanding is acetic acid has a mild affinity to hydrogen and at room temp the difference in evaporation of vinegar and water is negligible but long term aetic acid will be higher concentration. Which still makes your statement correct and my answer wrong.
I think it most likely evaporation is not the explanation, unless you evaporated a large fraction (like half or more).
Different types of bacteria may consume different organics and some may consume all types of organics that are in NOPOX. I'm not thinking that shifting the mix slightly will alter the N reducing effectiveness, but I am not certain.