PyLios(TM) Fish Tank Aquario Cleaning Tools Electric Gravel Cleaner Filter Washer Pump Siphon Vacuum Water Change Aquarium Accessories Easy to install and operate. Press the power on/off button, and the water will be pumped out automatically. Clean gravel, siphon the fish excreta and other dirt out effectively without requiring a water change. Also be used as a water siphon for water changes, or to empty your aquarium when you connect a hose to outlet. Practical and good quality