I've had a real hard time finding that brand of stump remover. All of the stump removers I've found in my local search for KNO3 are all from Bodine and are a sodium pyrosulphite compound. Do you think the K in KNO3 is more soluble than the K in Potassium Gluconate? Potassium Gluconate comes in pill form in the grocery. I guess I really could kill 2 birds with one stone by adding KNO3. I've been adding Nitrate of Soda to keep the nitrates up when they drop too low. Thanks for the reminder. I need to get some KNO3 online because none of the garden supply stores around here have it.