Okay, maybe it's not that weird, but here's the story anyway:
I put new water in the spa in December. We use it frequently but rarely use jets, mostly just soak.
I'm using 8.25% bleach. The spa has an ozonator that runs constantly (in a Hot Springs there is continuous water circulation and filtration and the ozonator is in this circulation plumbing, always bubbles bubbling).
Anyway after fill had pH of 7, CH of 140, TA of 80. I aerated and overshot pH a bit, added a little acid and things were settled in with pH of 7.4, TA of 60. My pH in the two months since crept up to 7.6 and has stayed there but TA has continued to rise. Today my numbers are: TA 120, pH 7.6, CH 140, FC 2.0.
The pool calculator gives me a CSI of 0.14. Water looks great. Is this high TA a concern since my pH appears to be rock stable? I'm serious, I have not adjusted pH in 2 months. Just add bleach daily.
Edit: I'm using a Taylor K2006C