The QZQ Aquarium Gravel Cleaner is a multi-functional aquarium tool that can be used to perform a variety of tasks. The siphon design principle is used to create a vacuum that allows easy water changes. The sand washer is equipped with two internal thickened airbags that can pump the water quickly. The aquarium siphon outlet pipe is also equipped with a filter that protects your lovely fish and small gravel from being sucked out of the tank. The QZQ Aquarium Gravel Cleaner is designed to be attached to the tank and has a flow regulator.