I hope you don't mind me piggybacking on this post, but I came here to post the same question.
Post split to a new topic. Yes we mind. JasonLion
TA = 100-110
pH = drifts up to 7.6-7.8 within a week of me bringing it to 7.4ish
CH = (can't recall my reading last night, but likely 200ish)
I've found over the past month or so that the pH drifts upwards in a fairly short span of time. My TA was around 140, so I calculated how much acid to use to bring it down, then let the pH rise naturally. But now I find I've been adding acid each week to get the pH back in line. The worst thing is, I haven't really used the pool that much at all. Maybe twice in the past month!