Keep the swimming pool ready for use with Clorox Pool & Spa Chlorinating Tablets. They work hard to keep your pool water clean from harmful bacteria and unsightly algae, saving you time and money. Each tablet is stabilized to ensure protection from algae and bacteria. They're also protected from sunlight, enabling them to last for a more extended time. Use these Clorox swimming pool chlorine tablets weekly for a good, clean swim you, your family, and your friends can enjoy. For use in your pool's skimmer, feeder, or floater. These pool tablets are composed of 99% chlorine, making them arguably the strongest chlorine tablet on the market. Some tablets contain additives that add specific features, such as killing algae, preventing corrosion, and improving filtration. But if you want a powerful tablet with the highest chlorine content you can find, this is it. Make sure you pair this 3-in chlorine tablet with a quality shock, such as Clorox Pool&Spa Shock XtraBlue. The best time to apply these products is during your weekly testing when you balance your water.