INSTEN Aquarium Fish Tank Bowl Gravel Siphon Hose Pump Filter Vacuum Cleaner This battery-powered cleaner will clean your gravel and catch dirt without doing a water change. It can be used to siphon the water out for a water change. It sucks the dirt with water through a filter bag, the dirt will be kept in the filter bag and water will return to the tank. Adjustable height by two interchangeable pipes of different length, suitable for both shallow and deep aquarium. Height Adjustable from 55cm to 80cm. Recommended for aquariums with 26cm-62cm depth. Easy to install and use. Power by 2 x CLR-14 Battery. User manual included. Accessory ONLY; batteries not included. All rights reserved. All trade names are registered trademarks of respective manufacturers listed.