Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? Draining (Siphon) Pond

Sometimes a picture says things better than I can manage to say. With regard to priming, starting with the pond end, sink the hose slowly to ensure all the air escapes. The pond end doesn't need a check valve but this would assist keeping the suction end below the water. It would be very handy to have a valve at the outlet end that can be closed. Essentially, you will slowly sink the hose and water will flood into the portion your have sunk. When you get to the end you should see the water there and once you have sunk the outlet the hose should be full of water. To save prime, close the valve at the outlet end. I have seen others use cellophane and baling wire for this piece (using corrugated drain pipe as the conduit). But the valve can very securely prevent air from rushing in when you lift the outlet end of the primed conduit. Also it can be opened and closed at will.