On the PoolMath app, choose “dry acid” and it will tell you how much to add. I also use Sodium Bisulfate/“pH down“/dry acid instead of muriatic acid. PoolMath is a lifesaver!
Muriatic acid is preferred on TFP but I don’t want to mess with it and have had no issues using dry acid for two summers now (and I used to have to add it almost daily).
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