With multi-layer structure and various filter media, this filter has a good performance In filtering. The built-in high efficiency UV Lamp (only efu series) can also kill various germs in water efficiently. The inlet and outlet nozzles of the filter are connected to the cut-off valve. So you can cut off the water at any time and easily detach the filter for cleaning and maintenance. The built-in pump and UV Lamp can be continuously used with low power consumption and low noise. They solve the water treatment Of cultivation Pet-Fishes safely and reliably. The scientific design of 4-press button and rubber seal ring assure the airproof performance of filter-lid and filter barrel. The rubber mat installed under the filter barrel has anti-slip and shockproof functions.