Using baking soda to raise pH may result in high Total Alkalinity. TA increaser is sodium bicarbonate. While it will raise your pH, it will raise your TA more so.
Sodium Carbonate is much more effective at raising pH. As a side effect it will raise TA slightly.
Are you testing for TA or just sanitizer and pH? If it is the latter, may I suggest you get some test strips or a kit that does test TA. Adjusting pH while ignoring TA can be a very frustrating experience:
For example if you use baking soda (bicarbonate) to raise your pH when its low, and your TA is good, this may result in water that is high in TA and good pH. Now, because your TA is high, your pH will tend to creep higher. Applying the logic suggested by Neohcouple above adding more baking soda to try to lower the pH will result in even higher TA and then even highr pH.
In summary, using Baking Soda to raise pH may work, but is not ideal. USing Baking Soda to lower pH will not work and will frustrate to no end.