Hi, I've been having an issue with PH rise since my pool was new. I have to add nearly a gallon of acid per week just to keep things in check. After reading about borate last summer I decided to try it and see if it would help (it has not). What really baffles me is the rise I get when to pool is closed for the winter! While closing the pool last November I lowered the PH to 7.2. Everything else was fine. FC 2.0, TA 90, CH 300, CYA 80, salt 3,600 , borate 50.
I opened the pool Saturday and the PH was off the scale. Using an acid demand test I estimate it was around 8.6-8.8. Borate was good, TA was 100 and salt was 3,500. Since I have a solid cover I only drop the water level about 8" and I re-filled by directing my cover pump hose into the pool during our recent monsoons.
What the heck is going on? I understand how the SWG will cause PH to rise while running but every winter I have this same issue and the resultant scale. I'm about to ditch the SWG but don't think it will make much difference. HELP!!