EHEIM Quick Vacpro.

The battery powered gravel cleaner enables you to clean the gravel substrate in your aquarium with ease, independently of your regular of water changes. The suction power of the cleaner is designed to remove dirt particles without too much disturbance to the gravel. A mesh filter compartment collects the dirt whilst letting the water flow back into the aquarium. The filter compartment is simple to remove. For intermediate cleaning of gravel substrate between water changes Bottom gravel hardly disturbed Water flows back into the aquarium Batteries included.