DONGKER Aquarium Biochemical Sponges Filter, Fish Tank Filter W/media Container for Oxygen Increasing and Cycle

【Multi-filtration】Pneumatic filter water goblin, multiple filtration, oxygenation, cultivation of nitrification, water purification 【Functions】Dual filtration of physical filtration and biochemical filtration, with a filter box to facilitate adding a variety of filter materials, built-in nitrification balls to absorb impurities in water, decompose fish feces and residual feed 【High Dissolved Oxygen 】Fine bubbles and high dissolved oxygen with a fixed strong suction cup, which can be adsorbed on the inside of the fish tank wall 【Easy to Set Up】Simply install an airline into the unit and turn on the air pump, great way to clean and oxygenate your tanks. Don't use tap water to clean it, simply squeeze the sponges in tank water. 【360° Rotating】360° rotating water outlet,telescopic water pipe, can be stretched and adjusted according to the length