Please pay attention to the product's color difference! 【Biochemical Filtration】This aquarium filter has 1 box of biochemical cotton inside, can collect and filter the waste in water, make waves and circular flow, help to cultivate beneficial bacteria, create a healthy water environment for your fish and turtles. The biochemical cotton is washable and reusable.

【Increase Oxygen】The air inlet of the aquarium filter increases the oxygen content of the filtered water, makes the fish more active. In addition, a good oxygen supply helps to cultivate beneficial bacteria such as nitrifying bacteria. You can adjust the oxygen supply by turning the air inlet valve. P.S.: The air inlet valve should be placed outside the aquarium and be in contact with air.

【Ultra Quiet】Premium pump motor is noiseless during operation. It is only 35 dB, almost like a whisper or the sound in a quiet library. We recommend turning off the spin button and stopping the air intake process at night, so that the filter pump will be quieter. In this way, it does not affect the function of filtration.

【Easy to Clean】It is very convenient to take out the biochemical cotton and wash it, or you can replace it with another filter medium. If you have any questions about our products, please contact us