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.he bypass flow principle means that the impeller chamber is constantly and automatically cleaned. As you would expect, the JUWEL Eccoflow pumps comply with the highest safety standards and are TÜV/GS certified. JUWEL Eccoflow pumps are available in performance categories 300, 500, 600, 1000 and 1500 l/h and are perfect for use in the JUWEL filter system.