Powerful and easy-to-use, the HTH Pool Care Tablet Chlorinating Chemicals 5 Lb 42052 are perfect for keeping your pool water clean, clear, and safe from unwanted bacteria and algae. These 3" chlorine tabs dissolve slowly and provide lasting protection for up to a week, making them ideal for all pool types, including vinyl-lined pools and saltwater systems. Enjoy hassle-free pool maintenance with HTH.