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Extremely quiet, using the latest generation of aquarium filter mechanism, suitable for fresh and salt water aquariums up to 400 litres. Annoying suction is one, thanks to the external pump – a thing of the past. The HW 504 is simply assembled and plugs straight in, the rest will 15 W pump with a flow rate of 1000 L/H The Quick Disconnect Coupling on the pump head allows the hoses from the filter housing to separate as they go on without to empty. The hose connections are 360 degree swivel seat. Adjustable flow by means of adapter lever. The HW 504 A offers a high flow rate and operates extremely quiet. Several filter baskets, for easy removal, allow you to use various filter materials from fine to coarse. Can be used individually to fill filter baskets. The filter is already large fitted and ready to use. Top prefilter traps coarse dirt efficiently stick back and also extends the lifetime of the biological filter material. Easy to remove, easy to clean, to use. Instructions: Wash before first set up once the filter materials from from your packaging. Please note that or more cotton wool may not belongings into the filter at a time.