Finally got my TA down to 80. Had the Mule Team 20 and acid on hand, so decided it was time to proceed.
Prior to adding anything my PH was 7.2. Using Jason's calculator, I added corresponding amounts of borax and acid to get me to 29 ppm, a bit over half of my target 50. I let it circulate overnight, and just tested this noon.
TA has risen to 90, and PH is 7.5. The PH change I can deal with, and didn't fully expect to end up exactly where I was, but the TA change caught me off guard. I thought borax increased PH but didn't increase TA? I have never used it before now, really haven't paid too much attention to posts about it, but that was my general understanding of the BBB thing, Bleach for chlorination, Borax for raising PH without raising TA and Baking Soda to raise both PH and TA.
Should I work to drop my TA back to 80 before I add the second round of borax, or wait until after the second round then work on TA?