I have a 17000 gal pool with spill over spa, ozonator, jug dumping, 50ppm of borate. The pool looks great, perfectly clear but my pH keeps drifting to 7.8. I have some iron staining so am trying to keep pH a little closer to 7.5. I am having to add about a quart of acid every week to get the pH down to 7.5. It stays there a few days and drifts back up to 7.8. I could understand if I had SWG but I don't. What's up with my pool?
On 8/23 FC 4, CC 0, pH 7.8, TA 150, CH 360, CYA 70, Added 1 gal of 10% chlorine, 1q 1cup of Acid. Goal is FC 5-10
On 8/28 FC 7.5 pH 7.8
TA is elevated I think because when we swim we run the waterfall. Since I live in swampy Houston I think CYA and CH will come down with all the rain we get. Trying not to do a partial refill because of the borates. BTW with the borates the water looks like glass.