5 in 1 function: Water change: built-in double airbags, large air cavity, good resilience, labor-saving operation Sand rake: aquarium siphon with 3D filter net, protect your favorite fish and small gravel from the aquarium suction Suction power: aquarium gravel vacuum cleaner, equipped with a duckbill suction attachment, easy to suck up manure Easy to use: Press the siphon switch several times, the water inlet pipe is partially filled with water, and the water outlet pipe stops pushing after water flows continuously. Check if it will be automatic. If not, keep running until the water comes out automatically. Small debris will be carried away by the current. When using, please note that the water outlet must be at least 20 inches below the inlet. Wide applications: The kit comes with two 15.7 inch inlet pipes. The installation length can be selected according to the height of the aquarium. It is easy to install and use. Adjust for different sized aquariums. Prevent clogging: The aquarium gravel filter cleaner can replace water and keep water fresh, with a filter basket in the tube, which can effectively avoid clogging of gravel, and effectively separate and remove sundries in the aquarium . High quality service: We provide you with high quality, low cost products and reliable services.