3 in 1 multi-function: Water pumping, Filtering, Oxygen Increasing. This filter can quietly pump the water up to 210L/H55 Gallons/H, flow can be freely adjusted, suitable for 20L-150Litres of various fish tanks or turtle tanks. Two options for water flow: one is the shower pipe, the other is direct drainage, direction can be adjusted in 360 degrees. All two ways can adjust the water flow according to your requirements. You can get the most suitable water flow for your aquatic tanks. Provide your fish or other aquatic pets a most comfortable environment. Three levels of filtration: Mechanical filtration, Chemical filtration, Biological filtration.Choose the most reasonable filtration materials to keep your fish tank clean, while also allowing some beneficial microorganisms such as digestive bacteria to be alive, so as to keep the small ecosystem inside the fish tank in balance.Built-in filter cotton can be repeatedly cleaned and used.