So I came across a few pools that had high (at least on the high side) pH, but relatively low TA (40). If I'm not mistaken, the pH will only rise if the TA is high enough to shift the equilibrium in that direction. At lower TA, the pH should either remain stable, or fall when an acid is introduced. The TA might be sacrificed when the acid is introduced, but in that situation, the pH and TA would both be on the low side. It seems to me that some other alkaline material would have to be added to raise the pH that wouldn't be part of the Carbonate/Bicarbonate reactions involved in buffering pH. I mean if we added Sodium carbonate to raise the pH, the TA would rise with it. And if the pH increase were the result of aeration, wouldn't the rate of off-gassing decrease as the pH increases, ultimately limiting the pH rise and the TA loss?