High Quality Chlorine Tablets - For the professional treatment of algae to ensure safe bathing in domestic pools and spas. Slow Dissolving - These pool cleaning tablets will slowly dissolve over a 3-5 day period providing continuous protection for you pool or spa. For Swimming Pool, Hot Tubs & Spa - Our multifunctional chlorine tablets are a simple and effective way to sanitise and stabilise water in pools, spas & hot tubs as well as eliminating and preventing algae to keep water clear. Easy to Use - Our products can be used with floating dispensers, floating skimmers and chlorine feeders for a simple and easy water treatment solution. Main Ingredients: Citric acid, peroxide, enzyme, surfactant, sodium carbonate. Can clean the swimming pool most efficiently. In this hot summer, you can enjoy the crystal clear swimming pool. These pool cleaning kits provide a safer, cleaner, and more enjoyable swimming experience.