FROG® @EASE® IN-LINE SANITIZING SYSTEM All Hot Spot® Collection spas come ready to use this in-line cartridge system that automatically dispenses SmartChlor® chlorine and minerals for carefree water care. It self-regulates based on the water’s sanitization needs, maintaining a consistent level of protection. @ease creates softer feeling water that’s virtually free of chemical odors since the system works with up to 75% less chlorine. Available on Hot Spot Collection spas.