The water level in the pump section of my fuge keeps going up and down. I will set it (with ball valves) and it will run fine for hours and then suddenly it will either go down too far or start filling and I have to readjust. I am running with pumps on each end. Would using another overflow be better? I have one going to my sump and of course when the water level goes up in the fuge it goes down in the sump and vice versa. I am about ready to throw one of them out.