The Grit Washing Plant is used for treatment of partly de-watered grit from waste water treatment plants. To continue, the product offers a conventional grit separation that separates all solids in the grit trap efficiently. Furthermore, the classified contaminated grit are then treated in the washing plant where the organics are separated from mineral particles. Moreover, it provides less than 3 % organic content, a very high solids content of > 90 %, easy to retrofit after existing grit classifiers and reduces disposal costs. The machine is very easy and safe to handle.