SpaBoss pH Reducer lowers the pH of your spa water. It is an essential part for hot tub maintenance. If the pH of your water is high, the water will be alkaline and the chlorine is prevented from doing its job since it combines with other materials in the water. This can sometimes cause an unusually strong chlorine odor that is not found when the pH is balanced properly. The water can also become cloudy, and eye irritation can develop. Scale build up may also start to form.