Thus is achieved a highly effective cleaning of the product with a minimum of water. Before entering the installation the clods and stones will be separated from the product stream. For potatoes, the installation is provided with a drying system with felt cloths. The washed product is therefore clean and dry to be further processed. Harnessing the highest achievable capacity is an important requirement for manufacturing companies. That includes Franzen Landbouw. Therefore, the washing line is provided with an exchange system. This makes it possible to wash separate breed or batches without too much loss of time during the washing process.