I have an indoor pool. It's covered 90% of the time to retain the heat as we live in the high country of CO.
My problem is, my PH keeps creeping up over time (weeks). I get the Alkalinity correct and the PH correct and then over a few weeks, it's out of kilter again. I suspect it's due to the fact that the cover is on and it's not a breathable cover.

Looking for thoughts / suggests of others that may have had these issues.