My pool loves low TA

[BillyBumbler]

It's an 18000 gal. inground pebbletech finish pool. There is a rock waterfall that I have set to run for 5 minutes every couple days to keep the water in the recesses from getting algae. Yes it is a SWG system. I keep the CYA at between 40-50ppm and the salt level at 2600-3200ppm. Calcium is at around 250-300ppm. FC always around 3 and CC always at 0. Water looks beautiful. In the past I've used baking soda to get the TA back up which resulted in the need for acid to reduce PH, which in effect lowered the TA. Kind of a Catch-22 situation. It could be that I use to much acid? I like to use enough to get the PH between 7.0-7.2 so that I go go a few extra days without checking.