HIGH QUAILITY: Built-in new K1 biochemical filter material, Imitate the filtering method of natural riverbed sand and gravel through continuous tumbling, the filter media collide with each other to let the dead bacteria fall off, and the new bacteria adhere to it. Unique design fluidized moving bed filter media with strong bio-film growth capacity. IMPROVE WATER QUALITY: The sponge filter of the bottom, traps large floating particles, air inlet connected with a air stone, great way to clean and oxygenate your tanks, and easy to clean. Improve the water quality of the fish tank, provide the most suitable living environment for your fishes. POWERFUL FILTRATION: Sponge decompose toxic waste in the water tank, removes any impurities, odor or turbidity, absorbs dust, is easy to clean and replace. Air stone diffuse air into the tank and provide oxygen for fish to breathe, produce quiet smooth dense small bubbles. EASY INSTALLATION: With 4 suction cups to make sure stable installation, it is easy to install and dismantle. Hook up to an air pump and getting all the benefits of oxygen in the water. simply take out the sponges, rinse and squeeze them in tank water, remember to clean the sponges weekly and replace regularly.