AutoPilot DIG-220 Pool Pilot® Digital Power Supply is a technologically advanced unit. The reliable and user friendly chlorine generator includes microprocessor controls with digital read-out of pool water temperature, current salt level, and purifier production level. You can also control the soft reverse cell cleaning cycle and boost cycle. The easy-to-read digital display on this in-line unit tells you how much salt to add when running low. The Pool Pilot® Digital has a patented temperature compensation feature that adjusts chlorine production according to the demands of the water temperature. The unit operates in water temperatures up to 104°F and can purify pools up to 80,000 gallons.