When trucks coming from the gravel factory are driving down the hill, their tyres are lightly contaminated. Still, as the road is an important regional road, it is very important to have clean wheels before entering the public road which is 100 meters away. The customer chose a DK-Econobridge wheel washer of four meter which is a basic yet for his application sufficient unit which was installed with the water tank top surface for easy sludge recovery. Because of low maintenance reasons the customer chose a scraper conveyor in the water tank.