UNIQUE DESIGN - Transparent housing makes it easy to detect when maintenance is required. With a strong fixing bracket and suction cup, the filter can be firmly fixed in the fish tank. The filter also provides biological, physical and chemical filtration. MULTI-FUNCTIONAL - This filter comes with 3 outlets, allowing you to easily select and switch between adding oxygenation and filtration, wave pump and submersible pump. ADJUSTABLE WATER FLOW AND AIRFLOW - The filter has an adjustable lever to easily control the filter's flow rate to suit your aquarium's needs. Efficient Filtration - You just need to increase the number of filter cassettes and install filter sponges or other biological media. Can effectively filter waste and improve the water quality of your aquarium/tank. EASY MAINTENANCE - The removable filter box is easy to remove and clean without tools.