Useful Biochemical Air Driven Corner Sponge Filter Fry Shrimp Aquarium Fish Tank aquarium filter Features: 1.Supplying the water with much needed oxygen 2.Reduces noise from air pump and consumes lowest wattage 3.Muti-layers, easy to clean and move 4.Various types of installations are possible 5.This filter uses bubbles of air from an external air pump, or an integral water pump to draw water through filter. As water is drawn out through the lift tube or pump, it is replaced by water entering the filter. 6.The top layer of white filter pad provides a mechanical filtration. The black bio-sponge in the 2nd layer and ceramic rings with gravel provides biochemical filtration. They support the colonization of bacteria. The bacteria help to break down harmful waste (ammonia and nitrite). Size:Radius is 6.5 cm/2.56", height is 12-17.5 cm/4.72"-6.89" (outlet scalable) Quantity: 1 Pc Note: 1.The sponge will need to be rinsed every time it becomes dirty, about once every 2 to 4 weeks. 2.Its helpful to reserve the beneficial bacteria by washing the sponge gently with water from the fish tank instead of tap wate Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Biochemical Air Driven Corner Sponge Filter Fry Shrimp Fish Aquarium Tank China stock delivery ePacket delivery is delivered at the earliest. Delivery takes 15-20 days, or possibly sooner.