PondMAX High Flow Pumps have been engineered to provide maximum flow for waterfalls and filtration systems. The high flow pond and waterfall pumps are great for medium to large backyard ponds and waterfalls. The PX series features a run dry and impeller jamming protection technology to give you a long life of enjoyment. The adjustable speed pump allows you to change the speed to 3 different settings based on your exact requirements to reduce energy and flow down to 60% of the maximum. Adjustable speed pumps for ponds can also allow for the flexibility to provide more flow when you need to backwash a pressure filter.