With a 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 the 4-press button and rubber seal ring assures the airproof performance of the Filter-lid and filter barrel. The rubber mat installed under the filter barrel has anti-slip and shockproof functions.