First off, what a deal. Half the price for double the weight when compared to Amazon. Diamond K is what I've always used for mycology but never for my plants. I've since started adding it to my soil for the calcium and sulfur and my plants have been loving me ever since.
SB; I was fighting a mystery deficiency which turned out to be a calcium deficiency. Ever since fixing that with some rock dust and gypsum, things have been smooth like butter.