UMY series washing screws are wed to seperate washing thm material which wanted and to take water later. Washed materials fall down to bottom and throw out being dragged by screw leafs from way out. Screw leafs had beed protected by changeable plastic priming coat to abrassive. Washing screws are made different diameters and lengths as one and two screws. Driving system is operated as reductör and chain-gears.