Boyu WF Series Hong-on -Filter design. water-pumping, water-circulation and water filtering 3 in 1. compact structure, beautiful aspect, simple assembly, and easy operation. 2. The filter contains multilayer biochemical filter system, which combines the latest decomposing technology of physics and biology. it is most suitable for cultivating good nitrobacteria, improving filter effect, and keeping the water crystal clear. 3. Waterfall type stream design. the stream can be adjusted at will to wave the water surface. that helps to release the carbon dioxide from the water, and to dissolve the oxygen into the water for the aquatic animals. 4. The pump motor is high-efficient, energy-saving with low noise. when the filter works, you can hear the chatters like mountain spring, enjoy the beautiful view of waterfall and stream. that will give you pleasure to your life. Applicable scope: Suitable for water-circulation, biochemical water filtering and adding oxygen into the water in various aquariums and zoology jars.