The Aqua Trol (also known as a salt chlorinator) is designed for above ground pools up to 18,000 gallons.
The Aqua Trol also has an integral time clock for control of the pool filtration pump. Since many above ground pools have a single electrical outlet for the filter pump, the Aqua Trol is designed with an outlet for the filter pump to plug into. The Aqua Trol then plugs into the original outlet the filter pump was using.
The Aqua Trol system installs in less than 30 minutes and is very easy to operate.