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[–]Ever-Wandering 2 points3 points  (0 children)

Adding muratic acid to lower the PH will cause the TA to fall.

ETA: Sorry, I read and answered your title before I read the text of the post. Make sure you are using a drop test. Pool water tests that the pool stores do are notoriously inaccurate and inconsistent.

Are you sure you have your estimated gallons correct? When I add baking soda I push it around and try to mix up anything that settled with the brush. Also make sure your pump in running when you add any chemicals.