【3 in 1 Function】: 1. Dirt suction. The aquarium gravel vacuum cleaner is equipped with a duckbill suction port, which makes it easy to suck up excrement. 2. Sand washing. The aquarium siphon with 3D filter net protects your favorite fish and small gravel from being sucked into the aquarium. 3. Water change. Built-in double airbags, air chamber, good load capacity, effortless operation. 【Working principle】: Manual compressed air. The improved part is equipped with a handle, which provides more operating space and is labor-saving and convenient. The maximum speed is tested by pressing seven times. The sand cleaner has two thickened inflatable cushions inside, which can pump out water quickly. Thanks to the ABS-PP materials, which are resistant to extrusion, you do not have to worry about damage and leakage of the airbag. 【Easy to Use】: Press the aquarium siphon vacuum siphon switch several times to ensure that the inlet tube is full of water. Once the water flows continuously under