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pH Up - pH Increaser - 5 Lbs. Personalized Orange Life Ring Buoy This is a Lasco InsertThis is a 5 pound container of pH Up, a pH increaser, which will effectively increase the pH levels in your swimming pool water. This sodium carbonate product is in granular form. A pool's pH levels should be maintained between 7. 2 and 7. 6. When pH levels drop, the water can become corrosive and cause build up of scale. Active Ingredient of the pH Up: 100% Sodium Carbonate. Directions for Adding pH Up to Your Swimming Pool: Add this product directly