Multifunctional Aquarium Filter: Our aquarium filter has four main functions: pumping, oxygen supply, filtration and circulation, the aquarium pump can be used in fresh water and sea water. This filter can effectively remove pollutants in the aquarium, therefore creating a healthier environment for organisms in the water. Adjustable Water Flow: The maximum flow rate of this aquarium internal filter can reach 300L/H, which is very suitable for 60L type aquarium, there is a unique design which can adjust the water flow through the inlet pipe located on the side of the internal filter of the aquarium, thus providing oxygen to the aquarium. Two Modes of Use: The aquarium pump has two usage modes. You can increase the oxygen through the inlet pipe and nozzle, or you can use the rain connection pipe to improve the filtering effect and make the water filter more adequate. In case of low water level, the filter can be placed on its side underwater so that it can be used in the turtle tank. Easy Installation and Cleaning:There are several Rubber suction cups on the outside of the aquarium filter, so it's easy to attach the filter inside the aquarium. The suction cup has strong suction force, safe and stable, and not easy to slip. At the same time, the built-in filter cotton can be easily replaced by simply removing the shell. Important Note: Rain mode and oxygen mode cannot be used at the same time. When using rain mode, please adjust the amount of water to avoid excessive water flow and affect fish life.