Spa Sparkle is an environmentally friendly supplement for your spa or hot tub water care system. Spa Sparkle helps keep spa water clean and safe, simply and effectively. A single weekly treatment of Spa Sparkle will prevent scale build-up in your system. Spa Sparkle works hard to remove existing limescale deposits, where bacteria and microorganisms grow, while preventing new ones. By removing calcium from your spa, your sanitization system will work more effectively, providing you with sparkling results. The water in your spa will not only be clean but also look crystal clear and feel soft.