The Pool Pilot Digital with PPC3 salt cell is technologically advanced. It controls feature a microprocessor digital display, giving diagnostics of pool water temperature, current salt level, chlorine production level, and allowing a soft-reverse cell cleaning cycle and boost cycle. The VFD digital display on the control unit can be read easily and even tells you how much salt to add if the salinity level ever gets low enough. The Pool Pilot Digital has a patented temperature compensation feature that actually adjusts chlorine production according to the demands of the water temperature, and operates in water temperatures up to 104F. It has a built-in time clock to control your pool pump...all at the touch of a button. For pools up to 50,000 gallons. (Equivalent to older RC-42, SC-48, and AP-250 models)