Quote Originally Posted by csevel
It's a 500 gal. tub. The PH is at 7.8 and the alk is at 220. All other numbers look good. How much muriatic acid should I add to lower the alk?
I would not add more than 1/2 oz. at a time (1 tablespoon) and then check the pH in about 20 minutes of filter run time. Repeat until the pH is at about 7.0 and then open up the air jets.