I just picked up the KNO3 I ordered from Rite Aid pharmacy. It is labeled Humco Saltpetre-Potassium Nitrate. It also says " Purified Granular for Technical Use Only", the name Household Farm is also on the label. It comes in a white plastic jar, 4OZ. (113G) and cost $2.84 plus tax. A bit more expensive than stump remover (which I could not find anywhere), but easy to get. HTH, Bob