For freshwater and saltwater aquariums up to 25 liters: Despite its very compact design, this micro internal filter offers a large filter surface and thus good filtration properties. All filter media are included in the package, including an activated carbon sponge that further enhances the filter's absorption capacity. The desired flow rate can be adjusted using a regulator. The Eden Fin 25 operates extremely quietly with low energy consumption – an ideal filter for small aquariums. It is also perfect for low water levels.