If your topside control has a digital appearance unlike the air button appearance, it will most likely be a digital control system. It is possible to replace air control systems with digital control systems. These systems are used on all newer spas. They are controlled through a circuit board through microprocessors. These are the brains of your spa which control functions such as heating, pumps, blowers, lights, etc. Electronic control have a wide variety of possible functions thus making a spa always advancing in technology.
