I just refilled my 250 gal hot tub, our water is quite high in TA (tests about 220ppm) but neutral. I understand the logic behind lowering the pH to 7.2 to lower TA but 'aeration' is not an option to help raise the pH back up. (It's too cold here to run the tub with the cover off.) Should I add back some baking soda? Should we just use the tub and raise the pH that way? I assume pH 7.2 would feel fine, though my Taylor test kit doesn't read below 7.2 so hard to know if I've overshot. Any thoughts?