Juwel Eccoflow pumps are the latest generation of Juwel flow pumps. In all Eccoflow pumps, the impellers are on a double bearing system and are specially tailored to the individual motor rating. This is what creates the extra operating quietness and low power input of the Eccoflow pumps. If you use the ceramic axles, which are available separately, Juwel Eccoflow pumps are also perfect for use in saltwater aquariums.