SmartTub™ allows you to monitor your hot tub's status, adjust the temperature, jet functions, and schedule maintenance reminders. 5-stage water filtration system achieves the cleanest water in the shortest amount of time. This is done through CLEARRAY®, which utilizes the same UV-C technology that beverage manufacturers, hospitals and other health care environments use without producing or adding gas, chemicals, or other by-products to the water as a result.