The Börger Multichopper is a comminution device with perforated disk and a multiple-blade cutter blade rotating on the supply-flow side for solid matter included in liquids. It cuts up coarse materials, which can then be comminuted. Multichoppers are applied mainly with diluted media, however, they are also employed in many other industrial sectors. The medium, consisting of liquid (generally water) and coarse solid matter, is drawn through the opening of the cutting plate of the Multichopper, which is adapted to the medium, by means of a pump or with suction-side pressure. The cutting blades rotating on the cutting plate cause many cuts per rotation and thus a reliable and troublefree comminution of the coarse material. By means of a central locking screw, the pressure of the rotating cutting blade can be adjusted in optimized relation to the cutting plate. On request, a "cutting-force, suction-side pressure automatic system" is available. The structuring of the cutting plate, the throughput quantity and the rotation speed basically determine the comminution result. Non-comminutable solid matter - such as e.g. stones or hard metal parts - are isolated before entry into the cutting plate, and are collected in the stone trap arranged below, from which they can be easily extracted.