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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.
For PH Down - 1 mL/gallon of water will generally reduce your pH about 1 point. That's just a very rough estimate, but gives you a starting point. In imperial measurements, that's 0.2 tsp/gallon (1 tsp/5 gallons) will reduce the pH by 1 point.