Pool Maintenance doesn't have to be hard. With REGAL® chemicals 3-step system you can sanitize, shock, and prevent algae to keep your pool crystal-clear and safe for swimming. The key to maintaining a crystal clear pool is a steady routine of sanitization. Regal® sanitizers are designed to kill bacteria, algae and other living organisms. Regal® Sanitizers have built-in protection from the sun to maximize chlorine life.