Originally Posted by Cb24
I have a generator so power outages won't be a big problem here. So I just want to get this right I'm gonna have the sump connect to the overflow box then have a return pump going back to the sump?
That's how it works. As the return pump tries to overfill your display tank the overflow box drains it back down. Part of the benefit of this layout is the display tank will always have a constant water level even with evaporation. The only place that evaporation will be evident is in the pump return section of your sump. That is the area that you will have to watch closely, so you can top off with freshwater to make up for evaporation.
The whole thing can be set up so that if the power goes out there should be enough free space in your sump to accept what water will drain down before the siphon breaks and water stops flowing.
Most people also try to set the water level in their display tank such that if the overflow gets blocked for whatever reason there is enough empty space to hold the water that is in the pump return section of their sump. In an ideal world you would have a float switch to shut off your pump before this happens, but that is an added expense that many do not go with. Just be aware that if this does happen and the pump drains the return section while you are away it will most likely burn itself out.