Hydor Seltz D DC Controllable Universal flow water pump. Whether you are a marine hobbyist or a passionate freshwater aquarist, know that Hydor’s Seltz D DC Controllable pumps are the perfect fit for your aquarium needs. The pumps feature innovative 6 pole electronic motor for energy savings. The pumps are controllable through the enclosed electronic controller to increase or decrease the flow at 6 preset points and has a feeding mode to pause the flow of the pump for feeding or maintenance inside the aquarium. The pumps can be used in-line or submerged, they are equipped with sensors that detect the presence of water moving through the pump so it will shut off the pump to prevent damage if no water is sensed. This space-saving DC Universal water pump features gallon ranges from 500 to 1000 and will pump head heights of 12.5 feet, depending upon the premium model you choose from Hydor. Use in freshwater or saltwater aquariums, bringing the best of aquarium technology to your home or office. It’s simple to use.