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Someone here mentioned using it.My guess drops per gallon. Do you use pool test strips to measure ph ect? I do.Lots of calculating dilution ratios for final test.I've used vitamin c powder, maybe 1/2 teaspoon per gallon which then gets mixed 16:1 by syphon.Lowered it from 7 to 5.5 or so, will take pics next time. Put 1 vitamin c in gallon of water & see how drastically it lowers ph.