The Marina Cool Gravel Cleaner is a practical tool for keeping your aquarium clean. Just pump it up to start and move the gravel tube up and down so that a continuous flow of gravel is picked up and returned to the bottom. Move the gravel cleaner to new areas as water changes from cloudy to clear. Intake tube size : 45 cm (18 in) Water tube size : 1.5 m (5 ft)