pH Up increase the pH of water in swimming pools. pH levels should be maintained between 7.2 to 7.6. When the pH levels are lower than 7.2, water may be corrosive. Water below 7.2 will start to degrade pool equipment, plumbing, and pool surfaces. Water may not be as comfortable for users to enjoy. Features: pH Increaser for swimming pools Prevents corrosion to pool equipment Powdered formula Size: 5 Pounds Dosage Amount: Example; If pH is between 6.8 to 7.1, apply 1 pound of this product per 10,000 gallons of water.