This is the same stuff I'm using. I couldn't bring myself to put stump remover in my tank. The loud wolf product is reagent grade. It costs a few bucks more, but worth knowing it's pure to me.I use sodium nitrate manufactured by LOUDWOLF on a BRS doser. Add 5 tablespoons sodium nitrate to one gallon RODI water. I dose 40ml per day to maintain nitrate of 3-4ppm in 110 gallon tank. Initially, I added manually about 3 ounces per day for few days to raise it from 0.