The Maxspect Gyre Generator XF230 35w suitable for tanks up to 400 litres, is part of the next generation of water moving technology. The development is based on a propeller nozzle facility rather than traditional powerheads and wavemakers. It's also the first device that specifically creates gyre-type water movement within the aquarium. Maximum flow rate: 8000 - 9000 litres per hour. Dimension: L 255mm x W 75mm x H 40mm.