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Alkalinity Increaser - 50 Lb. Bag gallons-per-day_50-74 This is a PVC TeeThis is a 50 pound bag of alkalinity increaser which will raise the total alkalinity levels in your swimming pool water. This sodium bicarbonate product is in granular form. This chemical is meant to be maintained between 80 150 ppm so that the water does not turn corrosive or create a scale build up. Active Ingredient of the Pool Grade Alkalinity Increaser: 100% Sodium Bicarbonate. Directions for Adding Sodium Bicarbonate to Your Swimming Pool: