Used to raise the alkalinity of your pool or spa, sodium bicarbonate (baking soda) is a great chemical option to use! Sodium Bicarbonate is a cost-effective and non-toxic solution for your pool. It is recommended that you make a solution first (fill a bucket half way with your pool or spa water then add the sodium bicarbonate and stir until fully dissolved) then add the solution to your pool or spa, distributing evenly.