Get prescription strength clarity with the Rx Clear 3" stabilized chlorine tablets. Slow-dissolving, with a balance of 90% available chlorine and 99% Trichlor to stop algae and bacteria growth. Our tablets are stabilized with cyanuric acid, forming an iso-cyanurite. this gives them a longer shelf-life and less of an odor than other types of chlorine that utilize calcium hypochlorite. Additionally, the Rx Clear 3" Stabilized Chlorine Tabs are UV protected against the harmful sun rays, which prevents chlorine burn-off in your swimming pool and reduces the number of pool chemicals you need to add, saving you money. Use 1 tablet per 5,000 gallons of water per week by adding the pool chlorine tablets to your pool's skimmer and using the flow of your pump to dissolve and distribute the pool chemicals. Each chlorinating tablet is pH 2.7, weighs 7 oz. and is individually packaged to take the guessing out of how much chlorine to use in your pool and reduce the chemical mess.