Quick hot tub TA question

I’ve had a pool for a few years but recently bought a hot tub. As far as TA goes, if it’s low and I add baking soda, it will raise the ph. If I then add acid to bring it down, that coupled with the aeration of the jets seems like it would just lower the TA and I’ll be stuck in an endless cycle of additions.

is there something I am missing? I have lowered the TA in my pool using the aeration method many times and this seems like it would have the same effect.