Couldn't you do a ppm test on an amount of clean water, then add the amount of cal-nit you normally use to it, then do another ppm test to determine how much you added? Then add calmag 1ml at a time to the same amount of clean water until you hit the same ppm? I realize there are different things in each, so it wouldn't be exact, but I feel like that would give you a decent number to start off.
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