1、AQUARIUM CLEANING: Aquarium water changer is used to suck up dirt, wash sand and change water. You don't need to touch the water with your hands. 2、SIPHON: Aquarium vacuum gravel cleaner just pinch a few times and the water will flow out automatically. Manual operation, save energy and time. 3、EASY TO USE: Fish tank siphon gravel vacuum cleaner is easy to disassemble and assemble, easy to use and store. 4、WORKING PRINCIPLE: Fish tank water changer works on the principle of gravity, when you use gravel cleaner, the incoming water must be higher than the outgoing water. 5、QUIET: Aquarium water changing siphon is safe and noiseless, energy saving and environmental protection, will not disturb fish, suitable for all kinds of fish tanks.