The system to further clean the organic fraction operates in two phases. In the first phase, the material is rotated in the Cyclone at high speed pushing the organic material through a perforation and separating it from the material that is bigger than the perforation - typically plastic film. Whilst the organic fraction is pressed through the holes of the cyclone, the remaining plastic falls over the top and is transported away by a screw conveyor.
In a second phase, inert material and contaminants such as very small pieces of stone, glass and sand are removed from the fraction. During this second phase, the biodegradable organic material is moved into a sink tank where the material comes to rest. Heavy material such as small stones and glass has the time to sink down in this tank. At the bottom, there is a scraper bar that slowly brings the sunken fraction out of the tank, above water level.