The ACE Water Care System uses a patented diamond electrode that creates active oxygen. Because cleaners are automatically generated from salt and water, spas with the ACE system lack the odor of chlorine and require fewer harsh chemicals that can irritate skin and eyes. It also generates cleansers in your spa water. This more hands-free approach saves time, so caring for your Hot Spring® spa is easier than ever. The ACE Salt Water System makes it easy to care for your spa, so you spend less time on maintenance and more time enjoying your Hot Spring.