Size:XY-2820 Quantity:1 welcome to my store , Hope you have a pleasant shopping trip! Features: 1.The bio-cotton filter is designed with high-quality bio-sponge material, durable and without any running noise. 2.The air diffuser can generate a large number of air bubbles and increase the solubility of oxygen in water.3.Easy to clean and reusable, especially suitable for raising small freshwater fish4.Soak in aquarium water for 5 minutes before use to form colonies of nitrifying bacteriaSpecificationsXY-2820 suit for fish tanks below 40L; XY-2821suit for fish tanks below 100L;Package List:1X Aquarium Biochemical Sponge Filter Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. The hanging filter is adsorbed on the wall of the fish tank, environmentally friendly high-grade sponge as the filter material, the mechanical and biological dual filtration is combined with the air pump to achieve the dual effect of oxygenation and filtration. The bio-cotton filter is designed with high-quality bio-sponge material, durable and without any running noise. The cotton is designed and manufactured with a multi-layer principle, has a large surface area, not have any obstacles to the flow of water. The air diffuser can generate a large number of air bubbles and increase the solubility of oxygen in water. Easy to clean and reusable, especially suitable for raising colorful fairy, fairy and other small freshwater fish SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied. See more product details The hanging filter is adsorbed on the wall of the fish tank, environmentally friendly high-grade sponge as the filter material, the mechanical and biological dual filtration is combined with the air pump to achieve the dual effect of oxygenation and filtration. The bio-cotton filter is designed with high-quality bio-sponge material, durable and without any running noise. The cotton is designed and manufactured with a multi-layer principle, has a large surface area, not have any obstacles to the flow of water. The air diffuser can generate a large number of air bubbles and increase the solubility of oxygen in water. Easy to clean and reusable, especially suitable for raising colorful fairy, fairy and other small freshwater fish SHOP WITH CONFIDENCE: To provide you with the highest quality service, If you have any question, please feel free to contact us.We will provide after-sales service until you are satisfied.