The Eheim CompactON 2100 is a versatile and powerful water pump designed for reliable performance in saltwater aquariums. As the successor to the popular compact and compact+ series, this pump is engineered for a wide range of applications, including use as a return pump, for running reactors, or powering other filtration equipment. Its robust construction allows it to be used either fully submerged or externally, providing maximum flexibility for any sump or aquarium setup. Built with high-quality materials suitable for marine environments, the CompactON 2100 features an adjustable flow rate to precisely match your system's needs. Its quiet operation is achieved through a durable ceramic bearing, minimizing noise and vibration in your aquarium cabinet. The pump's high performance is paired with low power consumption for energy efficiency, and it comes complete with essential accessories like a suction basket, threaded coupling, and strong suction cups for secure mounting. This pump is an excellent choice for reef hobbyists seeking a reliable, quiet, and energy-efficient solution for their aquarium's circulation needs. Its compact footprint makes it ideal for tight sump compartments, while its ability to be used externally suits custom plumbing projects. Whether you are setting up a new system or upgrading an existing one, the Eheim CompactON 2100 offers the performance and flexibility required for a thriving marine ecosystem.