I realize this is not the case here, but also keep in mind that you don't want to dose your pool with anything when it's at shock level--high levels of chlorine can give falsely high results with pH and TA testing, depending on your testing method, and cause you to overshoot your doseages. Also, you might find that the rise in pH that occurred when you added the baking soda can be temporary--often it will rise but then partially lower again as it all "settles" in the pool. It's generally better to dose your pool with one chem at a time, and like Carl said, creep up on your target dose instead of going all at one time. Patience is the key!!

Janet