I've had a hard time lowering my TA (which I want to do so I can add borates). I've added about 75% of the muriatic acid that the PoolCalculator.com recommended to go from 7.6 to 7.2, but it looks like I only got the pH down a bit, and the TA didn't budge. Here are my readings:
CC .25 (it was just slightly pink, and a whole drop seemed overkill)
CYA 5 (after almost 3 lbs of CYA, I finally got some cloudiness in the test tube, yay! but it was still easy to see the dot. Inching upwards!)
It seems that I need to bring the pH down way farther before it'll start dropping the TA, to between 6.8-7? Is it safe to swim in such low pH's? If not, how long does it take to come back up?