Features: .Bio-cotton filters are designed with high quality materials to last longer than any sponge filter on the market. .This kind of living cotton is designed and manufactured on the principle of multi-layer, with the largest surface area, and there is no obstruction to the flow of water. .Easy to clean. . This filter does not have any running noise. .Diffuser stone can produce a lot of air bubbles and increase the solubility of oxygen in water. .The design and manufacture of biochemical cotton is made after the large-scale test. .Especially suitable for raising colorful immortals, immortals and other small freshwater fish. 【Material and Size】100% Brand New High Quality. Material: plastic + cotton; weight: 400g 【Function】Provides biological filtration for the aquarium, which helps to stabilize the water quality. Increase oxygen solubility. 【Ultra-quiet】quiet work, good ventilation, easy to clean. Super bio-sponge filter, quiet operation, excellent filtration, while oxygenating
