Okie dokie! Starting the process today. Thanks for the explanation!Adding acid (muratic acid) will work to lower both your pH and your TA. It will lower pH a lot more than it will lower TA, so it is a process.
Basically, you'll add acid to lower your pH. You can go to 7.2 vs 7.4 even if you want this process to move faster, but either will work. When you add this acid, your TA will go down some.
Because your TA will still be high, though, your pH will quickly drift back up to 8+ where it wants to be. You can speed up this natural pH rise by aerating the water, i.e. having it move at the surface with splashing/fountains/pointing your returns upward/etc.
When the pH gets close to 8 again, you'll repeat this cycle and lower it back down to 7.2/7.4. The lower the TA gets, the longer it should take the pH to drift back up. Over time, with your TA down you should get closer to an equilibrium where the pH is comfortable in the 7s and you don't have to add acid so often.