Hello, for the last ten years my pool supply and the guy that acid washed my pool said to check only TA and keep at 80-100 and don' worry about PH, and that's what I've been doing. I installed the Hayward pro logic and the T15 SWG with the CO2 dispense system to help keep PH down, if I put enough acid in to bring th TA in range it drops my PH down in the 6 range. my pool supply said add the acid and don't worry about the PH. Over the last ten years every thing seemed fine, allthough i installed a solar system and last summer qnd i was adding a lot more acid. Any advice would be appreciated. Thank you.