Safety Material - This sponge filter is made from high quality plastic, it is durable and comes with an eco-friendly sponge that does not harm the fish. Effective Filtration - Cylindrical biochemical cotton has strong comprehensive filtration effect, no dead angle, it can effectively filter dangerous floating objects in the aquarium, and adsorb harmful substances to the sponge, so that the water of the aquarium is clearer and closer to natural water quality. How does it work? - This aquarium filter is powered by an aeration pump. It can decompose harmful substances by turning nitrifying bacteria into sponge and transformed into harmless substances for fish and returned to the aquarium. It works noiselessly and won't disturb your daily life. Easy to clean and assemble - Just connect the tube to the air pump and connect it to the filter, then plug it in and use it. All parts of the sponge filter are detachable, just rinse and squeeze the sponge into the water tank. Wide Uses - This fish