Hydor Seltz D Controllable 6000lph Universal Pump is a multipurpose electronic universal pump, designed for energy savings. Water flow is adjusted by on the included electronic controller. The Hydor Seltz D DC pumps are ideal for sumps, refugiums, biological filters and in general circulation of freshwater or saltwater aquariums to benefit the ecosystem health. Seltz D DC are equipped with pre-filter and barbed pipe fitting for various sized hoses. The Seltz D DC is perfectly suited for all applications that require submerged or in-line installation of the pump.