I read that if the TA is too high it can lead to the pH creeping up, but I'm curious if pH rise can also be caused by having the TA to low. My pH is constantly going up -- I have to add a does of acid (i.e. to drop pH 1 ppm) at least twice a week if not more to keep it at 7.4. My plaster is probably between 2 and 3 years old now, and I'm told that this is long enough to no longer have an effect on pH. My TA hovers around 60 or a bit higher, which I read was okay, but I'm wondering if this could helping the pH constantly rise, and if it's worth trying to raise the TA a bit.
I use a combination of pucks and liquid chlorine in a non-SWG pool.
I've noticed the same effect for the entire year that I've been here -- i.e. regardless of my specific chemical balance I see the same pH rise -- but my current test results are:
FC - 6
CC - 0
pH - 7.4
TA - a bit above 60
CYA - around 65
CH - 400 ish