Hunkeler drainage systems of the CROCODILE series are designed for the removal of residual liquids from waste materials. The CROCODILE empties free-flowing contents from synthetic drink-containers, Tetra-Pak containers, tin cans or PET bottles. In addition it can remove liquid from sludges. Optional, the system can be used for industrial waste or for the removal of water in the production of synthetic materials. Thanks to the reduction of weight through the removal of liquids, materials can be more economically disposed of at disposal centres.