I disagree that high TA works to my advantage. My pH is going up one way or the other because of all the aeration but it would certainly go up a lot slower with lower TA from my autu-fill, not to mention getting TA down from 330 is one huge PITA and requires spending a TON on MA. I'd *much* rather have a lower TA auto-fill, like 120, to help buffer against the pH rise than the 330 TA auto-fills I have right now. In other words, I'd rather start at 120, as opposed to trying to GET to 120 (from 330).If you do have high TA fill water, this works to your advantage. By using the aeration features of your pool, your pH gets forced up, allowing you to add acid which in turn lowers TA.