89% Available Chlorine These tablets are manufactured with the most concentrated form of dry chlorine available today. They are slow dissolving to allow you to reliably dose your pool once a week. Tables contain cyanuric acid- a stabilizer that prevents ultraviolet light from removing the available chlorine from the pool. Our Premium Tablets allow you to easily maintain proper chlorine residuals and help you to effortlessly produce beautiful, clean sparkling water. For use in chlorinators and automatic feeders.