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.