This is going to sound silly, but IMVHO that stuff is an absolute Godsend for growers. It's just meant to be the 'micro' part of the GH 3-part, rather than sold individually, but I have found it to be a really nice predictable way to foliar-feed micronutrients to suffering plants. Even before I figure out WHY they are suffering, if it's a lockout or deficiency, giving them foliar micros will simply bypass the root system and prevent whatever is wrong from getting worse- with some exceptions, but for stuff like pH or overfert lockouts, it's priceless!