Not sure which forum this should go in, so I am going to fire away here. I just replaced my old 300 with a new 300 chlorinator. My understanding is that when the pump turns off, the water is supposed to drain our of the chlorinator. Is this correct? I've noticed on mine that water is remaining in the unit. Once I open the top, the water then drains out. Anyone have any guess as to why it is not draining correctly? My first guess would be one of the valves is old. clogged, etc., but everything is brand new. Thanks for any feedback/advice in advance.