Efficient Magnetic Drive Technology designed for continuous duty operation. These energy-efficient, magnetic drive pumps have only one moving part. Specially designed to run continuously either in-line or submerged. Very low maintenance with an easy-clean pre-filter. Ideal pumps for aquaponics, hydroponics, fresh or saltwater aquariums. Model 2 - 250 gph Model 3 - 350 gph Model 5 - 500 gph Model 9.5 - 950 gph Model 12 - 1200 gph Model 18 - 1800 gph Model 24 - 2400 gph Model 36- 3600 gph