i have 1 tap on the intake and one return. to stop to much coming through. to get the siphon going you have to have one person putting their thum on the pipe and another person filling the pipe with water once the pipe is full, the person puts the pipe in the water and the person takes thier thum offf and you should get a siphon. the return pump is a maxi jet 1000 but when its in the sump and pushing it up its about 500-600 liters per hour.