Recommended values for a SWG pool

[Charlie]

Thanks for the great info.
Today, the pH is now 7.2 and the TA is 80. I'm trying to get the TA down so when the pH is 7.6 to 7.8 the TA will be within range. This is probably going to take a few weeks to bring it down by lowering the pH?

[waterbear]

Not al all. Just aerate the water (your spillover is a great way if you turn on all the aeration your spa has such as venturis and bubblers and blower if you have one until the pH is up to around 7.6. It won't take long. Lower it back down to about 7.0 and test TA again and aerate to bring it back up. Repeat until TA is at 70 ppm. If you are at 80 ppm it might only be one more cycle. If you overshoot then add baking soda to bring it back up, wait about 24 hours for things to stabilize and then adjust pH down a bit if needed. In your 14k pool one pound of baking soda will raise your TA about 5 ppm so I would add 1 lb at a time (convenient since it comes in one lb boxes!) wait 24 hours and retest TA and pH until it it at 70 ppm.

Adding acid lowers TA (and pH) aerating brings pH back up with NO effect on TA.