I've got a 200 gallon spa. My pH and TA were both very high. I've finally gotten the pH down to 7.6 with muriatic acid, but now my TA has fallen from 40, down to 20. I had been adding baking soda to try to get it up to 50.
Is there something else that will bring TA up? Does the age of the baking soda matter? Should I do it more frequently? What is the trick to getting TA up and pH down?
Is there something else that will bring TA up? Does the age of the baking soda matter? Should I do it more frequently? What is the trick to getting TA up and pH down?