I buy an overflow box and some pvc and some hose. Attach the hose to the outlet of the overflow and run it down into the sump and lay it in there, then get a return pump to match your overflow and plumb that up to your tank and make a little out let thing that sits on the side of your tank and don't forget to plumb in a check valve so your sump won't overflow when the power goes out. Also try doing a search and you should be able to find some pics.