Crystal-clear water thanks to multi-stage, mechanical/biological filtration Large filter surface in a compact size Low power consumption and quiet operation. Smart: External filter for smaller aquariums of up to 60 litres Practical: Self-venting function for easy operation Space-saving: Can be positioned next to or behind the aquarium. Can also be attached to the aquarium wall using the optional bracket Complete quick start set: Includes filter media, hoses, adapters, suction and discharge pipe as well as water diffuser