Cal Pump Waterfall Pumps provide excellent flow for medium to large ponds and waterfalls at a good price. The Cal Pump PWM Mag Drive Waterfall Pumps offer a significant improvement in longevity and energy usage over the Cal Pump PW Series Waterfall Pumps. The Cal Pump PWM Mag Drive Waterfall Pumps provide similar flows to the Cal Pump PW Series at lower head pressure applications used in most ponds and water gardens, but we still offer the Cal Pump PW Series for high head pressure situations. If you are purchasing a waterfall pump for the first time or replacing a failed pond pump, we highly recommend the Cal Pump PWM Mag Drive Waterfall Pump.