I recently switched over to a SWG and am loving the results and ease of maintenance. But I am noticing a steady rise in pH. I've also been battling to get my TA down through acid addition and aeration, but its slow going. It is at 90 now, down from 130 six weeks ago. Some weeks, my TA actually rises a bit, despite contantly dropping my pH to 7.2. I thought my fill water might be the issue, so I tested it last night. Sure enough it reads 8.0 pH and 130 TA. I'm adding about three quarts of 31.45% Muriatic Acid on a weekly basis. I should also mention that I foolishly added borates to the pool (about 40 ppm) before getting TA down, so that's not helping any.
My question is: Should I be doing anything differently? Am I resigned to a perpetual pH battle given the makeup of my fill water? About once or twice a week I measure pH and drop to 7.2 and like I said I go through roughly 3 quarts a week. I use the pool's aerator every night for the full 8 hours the motors runs. (Phoenix hits 110 almost everyday and I prefer my pool water at about 85.) Other than that my pool is very little maintenance. Thanks for your help and here are my test results from last night:
pH: 8.0/7.8? Hard to tell