I just set up my sump and its sweet, on the return i put in a ball valve to control the water flow back to the tank, and after the ball valve I have a check valve so if the power goes out, the water wont siffin back in the sump. But what if for some reason the overflow broke siffin? All the water in the sump would end up in the tank and than on the floor! Anyone have any ideas how to keep this from happening. Im not worried about the power going out and the water keep draining into the sump from the overflow, because I left enough room for the water from the tank to drain to the bottom of the overflow. If that makes any sense. But like i said above my main concern is that what if the siffin breaks on the overflow. The pump in the sump wont stop pumping till its draind. Can someone please help me with some input. Thanks.