I agree whole heartedly with Ray. My biggest fear is of a sump overflow, but there are ways to cut that chance down, if not eliminate it. My return is near the surface of the water in the sump. I also have an auto top off that keeps the sump level in check as to not run the pump dry. The top off only runs at night, and that is when I am home. If the siphon managed to break, which isn't that likely, the display can handle the excess water pumped from the sump until the pump starts to run dry. If the return got clogged, the sump can handle the water from the tank since my float switches are set at the lowest point to allow for more water in the sump. Then the only way that it could overflow is at night, when I am home. It would be the ATO topping off and something else failing as well. The ATO makes a loud beep while it is on, so it would wake me up before the situation got out of hand.

There are other ways around it, but planning is better than having it all dump on the floor.