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Are you really using soil? Are you using a medium that has clay and sand in it? Most indoor farmers are using a peat/perlite/vermiculite (PPV) mix, amended with lime from the mfg. to deal with the pH of the peat, which can be really low, like 4's to high 3's low. But, even then, fertilizers...

It is. Nutirent manufacturers use RO water when mixing and determining final nute profiles in they're mixes. To be honest, as important as final harvest quality and quantity is, it befuddles me as to why so many people use tap water and also spend money on stuff to try to correct issues...

Well, good is always subjective. What I see there is a good sales page for Ultra Epsom Salts. I'm not singling you out, as I think Cal/Mag and epsom salts to be overused, period. Over the years, most of the Ca and Mg issues I have seen in weed forum Infirmaries, are tied to something other...