Stabilizer – Arm and Hammer pool maintenance tabs – 1 each week
There's your problem, right there. A & H came up with those things as a way to sell baking soda expensively . . . even if you don't need any baking soda. Stop using those dumb things, and I think you'll find your pH/TA problems will go away!

Ironically about 15 years ago, when they were developing that program, those guys flew me to Princeton for discussions about hiring me as a consultant. I had to sign a confidentiality thingie, but I don't remember enough details to expose anything. I *did* communicate the idea that I couldn't see what it was that they thought was useful about their products . . . which got me put back on a plane to Chattanooga right quick-like.

The really funny thing is, that I suggested that they had a trusted brand that would allow them to dominate big-box (Walmart) sales of pool chemicals, if they were willing to sell commodities. They weren't interested, because that whole research group was apparently tasked with selling $ potato chips as $$$ pommes frites. I *still* think it was a good idea . . . since they've pretty much ended up doing just that, though on a much smaller scale then I suggested, providing 'baking soda' and 'washing soda' to bazillions of BBB users. (They could have been selling A&H dichlor, trichlor, cal hypo, bleach, stabilizer, HEDP and polyquat via Walmart, as well as baking soda and washing soda.)