Picture this: You walk into your indoor pool, ready to open it for a busy weekend of fun, when all of a sudden that all-too-familiar pungent chlorine smell hits you. Believe it or not, this "chlorine smell" is not a good thing. No, this odor is often an indication of high combined chlorine levels. Fortunately, there's an effective solution and it is not performing a breakpoint chlorination process on the pool, as some may suggest. The solution we are going to discuss in this article is the use of a chemical called potassium monopersulfate. We'll explore how you can use this powerful oxidizer to effectively lower combined chlorine levels in your swimming pool.