Danner Manufacturing, Inc., Pondmaster Pond-Mag, Magnetic Drive Water Pump 250 to 3600 Series Pumps have been designed to handle virtually any application where water has to be moved. They've been fulfilling the needs of professionals and consumers for decades with quiet, efficient and reliable 24/7 performance. They feature a magnet impeller assembly and an epoxy encased power unit. Pond-Mag 250 through 700 GPH Pumps are great for small to medium size ponds between 150 and 550 Gallons. Pond-Mag 950 through 1800 GPH Pumps are great for ponds between 850 and 1,100 Gallons. Pond-Mag 2400 and 3600 GPH Pumps are great for large ponds between 2,000 and 2,600 Gallons.