Dennerle Grvael Cleaner with integrated priming aid for Cleaning of the aquarium ground. Thus, the water change and the cleaning of the gravel can do in one step and mulm, dead plant particles or food praticles will be removed form the aquarium ground.Dennerle Gravel Cleaner:+ with integrated priming aid, no longer sucking with the mouth+ with double valve for simple use+ slimline suction pipe -ideal for plant aquaria+ with practical hose holder+ length suction pipe: 50 cm+ lenght hose 1.80 m