My trouble-free pool is doing great under the BBB method, in general.
I have noticed that the TA is high (tends to want to be ~125-130).
I add acid. Ph and TA go down, then I aerate to a higher pH-- at which point the TA is right back up there again.
Here are a series of test results (CH constant at 270, CYA 46, FCL/TCL hovering 2.0-4.0 as I add daily bleach):
day 1: pH 7.6 TA 134 => add acid
day 2: pH 7.0 TA 89 => aerate for a day
day 3: pH 7.3 TA 84
day 4: pH 7.4 TA 125
It's as though there is a source of alkalinity; like my 4-year old plaster is still curing, or something.
Is this a problem? Or do I just keep adding acid?