The sponge filter provides mechanical filtration, biological filtration, oxygenation, aeration for your fish tank, the air diffusion chamber produces a large number of tiny air bubbles, which facilitates the gas exchange process and increases the level of dissolved oxygen in the water, suitable for both fresh and salt waterHigh-density porous 60ppi fine sponge, protects small fish from being sucked into the filter system, 3 layers of ribbed sponge, provides plenty of surface area for beneficial tiny organisms to multiply and grow, good water flow, also traps floating debris and fine particles, allowing you to The fish tank is crystal clear, closer to the natural water qualityEasy to set up, you need an air pump and air tube, just connect the air tube to the air pump and connect it to the air inlet of the sponge filter, provides aeration and filtration in one solution, quiet operation, is clean and A great way to oxygenate your tankEASY TO CLEAN: Take out the sponge, just rinse and squeeze into the tank water, it is recommended to clean the sponge on a weekly basis, NOTE: Soak the sponge filter in aquarium (fish tank) water for 5 minutes when using it for the first time, it is easy to clean and form beneficial small animalsSuitable for fish tank size: 3 to 10 litersEasy to use: Equipped with suction cups, it can be installed anywhere and can be easily hidden on the back wall of the aquarium; suitable for shrimp tanks, betta tanks, breeding tanks, goldfish, discus, guppies , fry, juveniles or other fish