You will need a return hose to pump the water from the pump to the waterfalls.
Return hose Flexible PVC Pipe – The Pipe of choice for Pond Professionals. PVC pipe resists crushing when buried beneath the ground and maintains flexibility making it easy to install. Pipe connections secured using standard schedule 40 fittings and glue. Connects pump to waterfalls unit. Use for Pumps 2000gph and larger.
Use flexible Black Vinyl tubing to make connections from pump to waterfalls. Use for 35gph up to 900gph Pumps.