Pool Basics 47111011 25 lb 3" Jumbo Sanitizing Chlorinating Tablets - These Jumbo Sanitizing Chlorinating Tablets are for use in disinfecting and oxidizing pool and spa water. They clear cloudy water by killing bacteria and destroying contaminates. Whether being used for new pools or spring openings, regular water maintenance, or as part of the winterization process, these tablets are the perfect cleaner for any pool or spa.