On 01 January 2013 the revised annex V of the MARPOL convention for the prevention of pollution by garbage from ships entered into force. According to the annex, the discharge of all garbage into the sea is prohibited. Comminuted food wastes capable of passing through a screen with openings no larger than 25 mm may be discharged into the sea under certain circumstances. For macerating the food wastes, the customer uses a Börger Multicrusher Ocean installed in a 90° turned position. At the top opening, the kitchen waste is fed through a hopper. A special "tamping arm" is used to feed the solids to be macerated completely.