The pre-washing trommel in waste facilities uses a rotating cylindrical drum equipped with internal lifting wings and high-pressure water jets to clean PET bottles before further processing. As the drum rotates, the wings tumble and agitate the material while pressurized water loosens and removes labels, dirt, and surface contaminants. This early cleaning step improves material quality, reduces contamination levels, and prepares the PET for more efficient sorting, shredding, and washing in downstream recycling stages.