Don't use those chemicals in the lfs ... they won't keep the pH up for more than a few hrs & you end up with yo-yo-ing pH.
If you must raise the pH, you are better off using a carbonate source. Crush coral, crushed shell, crushed limestone, or any carbonatious sand will do the trick. These dissolve into the water until the water reaches equilibrium (~7.8 ). The dissolving stops at the equilibrium pH, so no matter how much you add, you can't over-do the pH. In addition, as the buffer is used up & pH start to drop, the cc dissolves in, keeping the pH rock steady.
Bicarbonate (Baking Soda) comes in when you have to do a large pwc. It takes a day or 2 to raise pH in your change water using crush coral, etc. So if you have to do an emergency water change, you can make up your change water quickly by adding baking soda to the water so the pH match that of the tank.