Keep your pool inviting, clean and clear. In only 24 hr, HTH® ultimate mineral brilliance chlorinating granules sanitize and clarify and even soften pool water. The multi-functional 7-in-1 action can also help to prevent stain and scale formation while effectively guarding against bacteria, algae and other organisms. These fast dissolving granules feature visible blue action to let you know the granules are actively working to produce clear results.