pH Plus is a granular product with a high alkaline formula, contains Sodium Carbonate, and is commonly known as Soda Ash. It forms an alkaline solution in water, which is high pH – this product has a pH of 11. It effectively increases the pH of pool or hot tub water to keep pH in the correct range. Sodium Carbonate is widely used today in home water softeners, and is an excellent descaler. The correct pH range from 7.2 to 7.8 will prevent corrosion, scaling and staining.