Flow Rate: 4000 l/h Freshwater tanks: from 250 to 450ltr - Marine tanks: from 160 to 250ltr Wattage: 4.5 Watt - The new Hydor Koralia Evolution is compact, energy saving , controllable and with amazing never seen before performance! The exclusive, patented, magnet-suction cup support has been improved becoming also a vibration-absorbing device. The new shaft-less impeller technology guarantees guarantees up to 20% more water flow with up to 50% less power consumption! Available in 3 models from 2800 to 5200 l/h (750-1400 gph), 4 to 5.5W! Product characteristics at a glance. Vibration Absorbing Device - The new improved design makes the magnet suction cup support an vibration-absorbing device. Unique Impeller Design - Wide and gentle flow. Sphere Joint - Adjustable flow directions. Magnet Suction Cup Included - Free positioning. New Impeller Technology - Shaft-less. Controllable - Can be connected to a timer (not included), and can work on intervals of seconds, minutes or hours. New Design - Smaller. Energy Saving - 50% Less power consumption, up to 20% more water flow. Comes with a 2 Year Guarantee