Can I run the pool water treatment ionizer on a timer with the pump?
You can but the amount of time the ionizer is available is reduced. If a small pool is used, the maximum setting of the ionizer may produce enough ions to keep the level up. Larger pools may not attain the desired 0.4 ppm level and need to be supplemented with a small amount of oxidizer and algaecide. Alternatively, you can increase the amount of time the pump runs. If the ionizer can be placed on a separate circuit which is not on the timer, the ionizer can run full time even though the water is not circulating. The ionizer will concentrate the ions (quite heavily) in any water left in the pipes and it will be dispersed in the pool or spa when the pump starts again. If the water drains from the electrodes when the pump is off, then no ionization can take place while the pump is not on.