Warning newbie SWG questions here. What do the actual cells run on? 120vac I assume, what are they rated for UL wise 2 amps, 5 amps? How do they know if water is being passed through the cell? Is the cell powered from the same circuit as the pump? I mean if the pump is on a timer does the cell need to be on the same timer or do they somehow know when it's on or not? To me the selling point might be the fact the pool can sit at .5 free all by itself.