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, thus creating a healthier environment for organisms in the water. Adjustable Water Flow: The maximum flow rate of this internal aquarium filter can reach 300L/H, which is very suitable for the 60L type of aquarium, there is a unique design that can adjust the water flow through the inlet pipe located on the side of the internal aquarium filter, thus providing oxygen to the aquarium. Two Modes of Use: The aquarium pump has two modes of use. You can increase the oxygen through the inlet pipe and the nozzle, or you can use the rain connecting pipe to improve the filtering effect and make the water filter more adequate. In case of low water level, the filter can be laid 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 is easy to fix the filter inside the aquarium. The suction cup has a strong suction force, safe and stable, and not easy to slide. 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 the rain mode, please adjust the water quantity to avoid excessive water flow and affect the fish's life. If you have any questions, please feel free to contact us. Instructions and Usage: 1. This submersible pump can be used for multiple purposes such as pumping water, spraying oxygen, filtering, etc. 2. Suitable for use in fresh and sea water, safe and durable, quiet, easy to maintain, and many other advantages. Note: 1. Avoid using extension cords. 2. Only suitable for working in water. 3. It is necessary to regularly clean the accumulation and dirt inside the shaft. 4. After cleaning, please confirm whether the joint between the water blade and the shaft has been tightened.