First, a pic for reference (click to enlarge): The return pump I have is more powerful than my overflow capacity, and I'm looking for opinions on safe plumbing routes. For the outlet I plan to 'T' off the line with a return to the sump controlled by a ball valve so that I can control the volume of water sent to the DT without restricting the flow through the pump. There would be a check valve in the DT line to prevent backflow/siphoning as well as a small 'siphon break' hole at the outlet just below the waterline for security. On the inlet I'm considering using an inverted 'U' bend to set the minimum water level in the sump that will always keep the pump submerged in the event of a siphon break at the overflow, with the maximum water level set at a point that would not overfill the DT Can anyone tell me if there are any risks I have not considered or other factors I need to take in to account? Cheers.