Maintaining proper pH balance is necessary to control scale, maximize sanitizer effectiveness, balance total alkalinity, and correct mineral imbalances. SpaGuard’s pH Decreaser* lowers high pH and alkalinity down to optimal levels, simply by adding this quick-dissolving granular formula to the water. Also helps prevent scale build-up and cloudy water that could occur when the pH of your spa water is too high on the scale.** Granulated. 22 oz. bottle.