Valcke Prefab Beton NV operates several precast component production facilities at its factory premises in Vlamertinge. Façade elements with washed out surfaces are produced in one of these manufacturing units. A highpressure water jet system is employed for this purpose. As a result of this production process, great amounts of washout water mixed with washed-out solids are generated when laying the granulation bare. In close consultation with the customer, ecofrog® GmbH developed, installed and commissioned a continuous flow-through process for clarifying the 40 m³ water incurred on an hourly basis. The goal with this process was to achieve a closed water circuit enabling the alkaline water to be reutilised in the wash-out system. This process allows Valcke to put local environmental conditions into practice and saves up to 400 m³ water per day.