1. 3in1 Aquarium Cleaner: This Aquarium Vacuum Cleaner comes with 3in1 functionality, where it can be used as a water changer, a sand washer or to clean fish tanks, ing a clean habitation for your favorite pets, suitable for 16' height small aquarium with 8 to 13 gallon of water or a water level higher than 7 7/8'. 2. Easy to Operate: The water valve allows for easy and convenient adjustment of the water flow, simply by pressing on the siphon to pump water, then attaching the suction cup to the water inlet. When pumping, the outlet water level must be lower than the inlet water level. When cleaning, press the airbag repeatedly until water flows out automatically. 3. Builtin Filter: The water inlet is equipped with a filter to prevent accidental injury to your fish or shrimp by being tossed around by strong pressure, or from being sucked into the sand washer. 4. Safe : Made of sturdy ABS material which is nontoxic and NonBPA, ensuring use and a long life.