Many pool owners use sodium bicarbonate to increase the alkalinity of the pool without having an impact on the pH. It is commonly referred to as baking power and can also be called sodium hydrogen carbonate.
The best pH for pool water is between 7.4 and 7.6. When the pH falls below 7, a number of problems arise. Acid starts dissolving metals in the pool, resulting in stains on the pool wall. The addition of sodium bicarbonate helps to correct the acidic water. It is necessary to put a small amount into the pool first to avoid the risk of making the water too basic.