5 lbs bucket of stabilized chlorinating tablets for swimming pools Kills and prevents all types of pool algae (green, mustard, black) Long lasting, slow dissolving sanitizer provides 24-hour chlorine residual for continuous protection against bacteria and algae when used as directed Leaves no residue and no mineral scale build up Non-blended, no fillers, and protected against sunlight to last longer Not all pool chlorine tablets are created equal. Leslie's chlorine tablets have the highest available chlorine for killing algae, bacteria, germs, and other microorganisms. For more than 50 years in the United States, we've produced and controlled our proprietary formula which is highly compressed into our chlorine tabs for a concentrated, slow-dissolving sanitizer for convenient use in above ground and in-ground pools. Stabilized Chlorine Our 3" tablets consist of stabilized chlorine, meaning they are protected from sunlight to last longer. This ensures the chlorine continues to do its job in the water rather than breaking down when exposed to sunlight. Kills Algae and Bacteria For clean and clear water with less effort, each tab contains the highest amount of available chlorine. This provides consistent sanitization by killing algae, harmful bacteria, and eliminates swimmer contaminants such as body oils, suntan oils, sweat and lotions. Long-Lasting Tabs We continue to control the entire manufacturing process of our proprietary formula which is densely compressed into our chlorine pucks for long lasting and slow dissolving chlorinating sanitizer. You get a longer-lasting product that provides 24-hour chlorine residual when used as directed.