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Lower the high pH in pool water. Adding an acid to the pool water reduces the pH. The most common chemicals used to reduce high pool water pH are: muriatic acid - typically 30% - 35% liquid hydrochloric acid; sodium bisulfate - granule or powder pH reducer, dry acid.
Rating Newest Oldest. Best Answer: You can't. You can lower it using the stuff from the pool store, or Muriatic Acid which is available at most hardware stores. You should be aware that using baking soda to raise Ph will also raise your Total Akalinity.