We have developed a number of machines for destoning and washing potatoes, root vegetables, etc. These machines, which can be entirely made of stainless steel, are renowned for their reliability and water-saving properties. The drum washer, for example, can have a screw system in the water reservoir. As a result, the mud is removed separately and the unnecessary draining of water is avoided. The washer can also be combined with a destoner, which makes the water usage even more economical.