The washing installation is an extension to the fully automatic sorting line. This is used to wash the sorted films and to make them suitable for the next step in the recycling process. The line consists of a bunker, NIR separator, drum washer, screw press, conveyor belts and a water treatment system. With the help of this line the final check stroke takes place on the films with the aid of the optical NIR separator. With this, for example, certain colors can be filtered out, which is a wish of some processors of the films. The films are then washed with the drum washer and dewatered by means of the screw press. To be able to reuse the water, a water purification system has also been supplied.