Check the listing for details. Pool pH Increaser - Soda Ash to Raise pH Levels In The Swim. Condition: New. Listed at 64.99 USD. With powerful and effective results, this pH increaser is available at only half the price. Whenever the pH level goes under 7.2 all you have to do is add pH increaser. This will reduce any acidity and fix water conditions. The pH level of your pool water is a vital element of your pool's overall water chemistry. PH measures how acidic or basic the water is on a scale of zero to 14, with the ideal pH for swimming pools falling in the range of 7.2 to 7.6. When the pH level of your pool falls below 7.2, the water becomes acidic and can cause eye irritation, corrosion of metal pool equipment, dissipation of chlorine, etching of plaster walls and unsightly stains.With powerful and effective results, this pH increaser is available at only half the price. Whenever the pH level goes under 7.2 all you have to do is add pH increaser. This will reduce any acidity and fix water conditions. The pH level of your pool water is a vital element of your pool's overall water chemistry. PH measures how acidic or basic the water is on a scale of zero to 14, with the ideal pH for swimming pools falling in the range of 7.2 to 7.6. When the pH level of your pool falls below 7.2, the water becomes acidic and can cause eye irritation, corrosion of metal pool equipment, dissipation of chlorine, etching of plaster walls and unsightly stains.