Safe Material: This aquarium sponge filter is made of premium plastic and sponge, non-toxic and environmentally friendly and environmentally friendly sponge that will not harm fish. Improved Water Quality: The pores of the sponge filter have a large surface area for aerobic bacteria to multiply. By cultivating nitrifying bacteria, you achieve excellent biological filtration in your tank. In addition, your aquarium water remains super clean and crystal clear. Easy Installation: The water outlet pipe on the sponge filter is adjustable, so you can change the direction and height of the water flow. Compatible with 2 suction cups, can be installed anywhere, can be easily hidden on the back wall of the aquarium and can also be used as a pre-filter or secondary filter. Removable Sponges: You can easily remove the sponge from the filter for cleaning or replacement. Use tank water instead of tap water to clean it when changing the water. Simply rinse and squeeze several times until the water runs clear. Widely Used: This aquarium filter is small and easy to hide behind the plant. Perfect for shrimp tanks, bedding tanks, breeding tanks, turtles, goldfish, discus, river cancer, fish, baby fish or other fish. Removes floating particles and pollutants in the aquarium water, increases the oxygen content and ensures clear water and a clean aquarium environment.