The “Drum filter” part is identical to the AquaForte Prime Drumfilter XL. The bio chamber has a volume of over 200 liters and is suitable for at least 100 liters of media/biorings (such as KNS, Helix, Kaldness K1 etc.(Because of the slots in the returns, the bio chamber is not suitable for really small media like Eco Pondchips) *Bio media is not included.* *Bio chamber is equipped with large membrane aerator and piping for air pump connection. Max. flow ±30m3/h. *The perfect combination for mechanical & biological filtration in one housing. Very compact size for a total filter system, fits on 1 pallet!