Keep the water clean: The aquarium filter has a unique shape, which can reduce the number of water changes in the fish tank and create a clean and healthy environment for your aquatic life. High-efficiency filtration function: The built-in filter has good filtration performance, can absorb and remove grease and other dirt, form a filtration and circulation system, and achieve the effect of water purification. Friendly Design: Unique rain shower pipe, creating a waterfall effect. The water inlet adopts a narrow fence to effectively prevent fish and shrimp from entering the filter. Easy Installation: A sturdy suction cup is attached to the back of the filter, easy to attach to any place can be fixed in the aquarium. The 4W filter is suitable for 40-60 liter aquariums. Maximum flow up to 300L/h. Wide Application: Not only can be used as a filter, but also as an air pump to increase oxygen levels. It can be used in fish tank, fish tank, breeding pond, stone fountain, waterfall, hydroponic system, etc.