We have had a spell of really mild weather and during that time there wasn't much swimming taking place. Chlorine levels have been fine but I've having a really hard time maintaining what I consider a good PH level. I've been struggling to maintain a PH level above 7.4 for more than a couple days before I have to add Borax, I've gone through more Borax in the past week than I did all summer. Every few days the PH drops to the 7.0-7.2 range, I then add Borax according to PC to bring the PH up to 7.8. I check either later that night or the next morning and I'm not getting anywhere near the 7.8 I'm wanting, it's closer to 7.5-7.6. I've checked my TA repeatedly and it is running around 100.
The pool had been covered with a solar cover
Temps over the past few weeks have averaged a high of 75-80.
Filter/pump runs 24/7
Any ideas?? I've read that PH regulates itself by being exposed to air, sun, and swimming so I'm hoping it's just a case of my kids need to swim more.
Thanks in advance