A great feature on all the Chloromatic chlorinators is the chlorine controller. Unlike other makes where, when you turn the unit down, the chlorine production goes down, on the Chloromatics the unit still operates at 100%, however it will turn itself off for a period of time, then it will turn itself back on. (Just like a thermostat.) This on-off process is determined by where you set the chlorine controller. After some experimenting, you will know where to have the unit set for your size pool. By turning the cell off for periods of time will in fact extend the life of the cell considerably.