Ph is 7.9 and need to bring it down ... I got MA from home depot and it is 20% (13 baume) but no option for that on pool calculator. Is there a way to add it or what do you guys do?
Use the 15.7 dropdown choice and put a slightly higher pH as the target than what you are aiming for. It's always better to take half steps than over shoot.
Go back to Pool Math. Scroll to the bottom past the table and there is an "Effects of adding chemicals tool." It's ~15% on that tool but that should get you close. PH adjustments are approximate anyway.
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