The most recent tests with my swim spa shows the TA at 70 and pH at 7.2
I would like the pH a little higher (around 7.5-6) and have used borax to do so. It does raise the pH up to the level I am looking for, but then it drops back down (within a day or so) to 7.2
I understand that TA is a buffer and helps keep the pH steady, but I guess I am not totally understanding of the relationship between the two.
I had kind of assumed that the buffering effect of TA would work to keep the pH at whatever level I adjusted it to, but that does not seem to be how it works.
Is there a kind of "sweet spot" where with a certain TA, the pH will always move towards that pH? In other words, in my spa with a TA of 70, the pH is always going to try to level out at 7.2? Even if I raise the pH to 7.5, it will move back to 7.2?
If that is true, then I assume that if I want the pH to level out at something higher (7.5), then I need to raise the TA until I find the level of TA that has a "sweet spot" of 7.5?