In The Swim pH Increaser for Pools - 25 Pound - Granular 100% Sodium Carbonate (Soda Ash) to Raise pH Up Multicolor

The key to proper pool chemistry is pH. When the pH drops below 7.2, just add granular pH Increaser to correct acidic water conditions. Dosage rates can vary based on your pool's current pH, but it is best to begin with an initial dosage of 1 lb. per 10,000 gallons. pH increaser is also commonly referred to as Soda Ash.