Clearwater Multifunctional Tablets have been designed for the complete disinfection of your pool and Lay-Z-Spa when used with a Chemical Floater. WIth 4-in-1 uses, these tablets sanitise, stabilise, reduces and prevents algae build-up, and clears cloudy water. An easy way to maintain your pool's chemical hygiene, you only have to load up the chemical floater, which then floats on the surface to maintain clean and clear water. Each tub contains 20g tablets which offer lasting protection for your pool or spa water. Please be aware that these Multifunctional tablets should never be directly added to the pool without a clean applicator such as a Floating Dispenser. Fill the dispenser with the correct amount of tablets depending on your dispenser and pool size. This will always vary and please note the dispenser should always be removed from the pool while people are using the it. Please check the safety instructions before using these tablets. General precautions when using Clearwater Multifunctional tablets are: Wear eye and face protection to ensure no granules are blown back in your face; Never mix with other chemicals to avoid chemical reactions; Always add product to water not water to the product; Wash hands after use; Handle products ideally outdoors in a well-ventilated area; Do not allow chemicals to become damp.