pH Down is used for lowering the pH of swimming pool water. High pH may make conditions favorable for scale to form on equipment and surfaces. Additionally, high pH levels may cause pool water to become cloudy. pH levels should be maintained between 7.2 and 7.6. Features: pH decreaser for swimming pools Prevents scale Increases sanitizer efficiency Granular formula Size: 3 Pounds Dosage Amounts: Example; If pH is is between 7.7 and 8.0, apply 12 ounces of this product per 10,000 gallons of water.