John,
Lowering TA is a process.. For me it takes a couple of days of continuous testing and dosing..
Basically I test the TA and pH levels and note what they are.. I turn on my waterfall to generate aeration and leave it on. I then add the necessary acid to drop the pH to about 7.0, then wait about 3 or 4 hours and test pH and TA and add acid to drop the pH to about 7.0.. I just keep doing this over and over... At first the TA does not drop too much, but as time goes on, the drop will get larger and larger.. I do this from early morning until it is time to go to bed, I then pick it up again the next morning.. I never shut off the aeration until the TA is where I want it.. I always drop the TA about 10 points below where I actually want it.. So if I want to have a TA of 60, I'll drop it to 50 because it will bounce back 10 points in just a day or so..
Thanks,
Jim R.