Use this Spa Time 22 oz. pH Down for Swimming Pools to lower the pH level in your pool. This prevents against scaling and cloudy water. Your pool or spa water should be maintained at a pH of 7.2 - 7.8. Test water frequently with a test kit or test strip to ensure pH levels remain in the recommended range. This kit is compatible with all sanitizers including bromine, chlorine, and biguanide. It's available in quantity options.