Clean water is the cornerstone of spa enjoyment. MAAX Spas® CleanZone™ water purification system will automatically maintain healthy, crystal clear water while greatly reducing chemical maintenance. CleanZone™ is an ultraviolet plasma cell ozone system that disinfects and cleans your spa water. And best of all, CleanZone™ does not require any cleaning or maintenance whatsoever. Worry-free enjoyment, throughout the life of your spa.