Total Chlorine includes both Free and Combined Chlorine. Free Chlorine is "good" chlorine that is still able to keep your pool fresh and clean. Combined Chlorine is chlorine that has used up its ability to sanitize. Too much Combined Chlorine causes eye irritation and strong pool odors. To maintain a clean and clear pool, keep the Free Chlorine in the right range. But before making any adjustments, be sure that pH and Total Alkalinity are in the ideal ranges. If the Free Chlorine is low you will need to add more.
