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The recommendations for using the stump remover and it being OK from a purity standpoint are purely based on user reports (quite a few now), rather than any data on impurities in it, which I have never seen published.
Assuming no depletion of potassium or changes due to water changes while using it, it will add 63% as much potassium as nitrate.
So 2 ppm nitrate per day will add 1.3 ppm of potassium. I wouldn't want to add that much for too long without monitoring potassium, and is why I recommend sodium nitrate.
2ppm Daily is a lot of NO3, does anyone use that much?