Clorox Pool&Spa pH Up raises low pH in your pool that can cause red, irritated eyes and expensive corrosion damage to your pool equipment. Use as needed to achieve a suitable range of 7.2 to 7.6 to keep your water swim-ready and clear. For use in traditional chlorine and salt chlorine pools. Test and balance your pool weekly to maintain clear water, longer lasting equipment, and comfortable swimming. Maintaining proper pH of 7.2 to 7.6 is both important and easy. Important, because if pH is too high, chlorine cannot effectively sanitize and disinfect your water, and water will irritate your skin and eyes when you swim. If pH is too low, corrosion can occur, and the pool water will irritate your skin. Easy, because all you need is the "Clorox Pool" app, the proper balancing product, and a regular maintenance routine to maximize the pool fun!