Eheim GmbH & Co. KG is a German company founded by Gunther Eheim, operating in the domain of aquariums and aquarium accessories. Also, a modern and seemingly unrelated domain that Eheim got indirectly involved in is the use of its aquarium pumps in the liquid-cooling systems of overclocked computers. Similarly to aquarium filters, these cooling systems require small water pumps with a low noise level and reliable continuous operation.