Hello, I have a 13.5k gallon above ground pool and I cant get the PH to stay above 7.4. I can raise it fairly quickly to 7.6-7.8 using aeration but it drops back to 7.4 after a day or so. My TA is 90 and the plan was to lower using MA but dont want to risk not being able to raise the PH back up. Any suggestions? Below are my test results using a Taylor k-2006c and they've stayed pretty consistent since opening a few weeks ago.
FC 5
PH 7.4
TA 90
CYA 45
CH 230
FC 5
PH 7.4
TA 90
CYA 45
CH 230