Feature:●Biochemical cotton filter use air pump as power source,working noiselessly●Sponge filters provide both mechanical and biological filtration●With an airlift system, super biochemical sponge filter features silent operation, and has an excellent filtering effect while oxygenating the water.●The special developed foam materials support the colonization of bacteria growth. It allow for mechanical filter in addition to biological filtration, which will break down harmful waste, ammonia and nitrite material.●It result in a cleaner living environment for fish, particular they are useful for as breeding filter or as secondary filter●Supplying the water much needed oxygen●It reduces noise from air pump and consumes lowest wattage●Most fit to external or top filter as prefitration unit●Easy maintainence is made by nodular design of foam cartridge system●Provides biological filtration to the aquarium, helps to stable water quality●The air diffusion chamber produces air bubbies which increase the oxygen solubility in the water●The item has good durability and filtering effect, and is suitable for the growth of nitrifying bacteria in environmental protection sponge as filter material●Increase the oxygen solubility●Quiet operation●Good permeability, easy to clean●In order to make sure that the filtering effect,please replace biochemical cotton once every six monthsTo use:●Please put the whole filter into the tank before use, or is completely immersed in water●Please pinch the sponge gently ley the sponge part all wet, then the filter will sink to the bottom of tank●Connect the filter and cultivating pump tube●The pump is connected to the power supply, it will start to arise the filtering effectProduct Attributes: Quantity: 1 PcsSize: Approx. 5cm x 5cmPackage Include:1 x Aquarium Biochemical Sponge Filter Note:1.Please put the air pump at a positon higher then the water tank.If it is put at a lower position,water in the tank will be poured into the air pump.2.Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand. Make sure you don't mind before you bid.3.Please allow 1-5mm differences due to manual measurement.