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Although citric acid isn't actually designed for hydroponics, it can be considered as 100% suited. It is among others even recommended as a fine acid buffer by a chemist who is actually working as a nutrient designer for a nutrient manufacturer.
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Sorry I misread your disclaimer. Because I mentioned before that you will have the
problem of dosage with any pH product (made for hydro or not), that didn't seem to be an issue to me. I know that
citric acid is used in manufacturing hydroponic pH adjusters, It may in fact be the base ingredient with what I use (so it's has been guessed). But never the less. For anyone starting out in hydroponics, I cant recommend using a product that wasn't designed for hydroponics, at least until they have gained some experience and are willing to sacrifice the plants to experiment.