How do I control the pH in my pool?
How do I control the pH in my pool? To lower the pH, the most common liquid acid used is muriatic acid, also known as hydrochloric acid. To raise the pH, soda ash (sodium carbonate) is normally used. Sodium bicarbonate (baking soda) can be used to raise pH if the alkalinity is low, but it’s more commonly used to raise alkalinity.