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Staghorn is the worst!!! If you have success doing it the way you are describing then you got very lucky. If you are not planning to spot dose then filter on. If you are going to spot dose (and I think you will before this is all over) then filter off. Frankly if you can even get it under control spot dosing just peroxide you lucked out. If/when that fails look into the "one two punch" thread on this forum. Basically heavy dosing excel and peroxide. Might kill plants and livestock as well so beware.