What is Free Chlorine?

Free Chlorine is an excellent indicator of the effectiveness of the sanitizing aspects of chlorine in your solution.

Free Chlorine refers to the amount of chlorine that is floating around in solution that is still available to sanitize. Available forms of free chlorine include hypochlorous acid and hypochlorite. Free chlorine can be measured with a test kit, a checker colorimeter, portable photometers, and benchtop meters.