At ground of metal processor van Dalen Metals the contaminated rainwater must be treated . After rainfall, the water ends up in an underground pipe system. Through this system the water is separated to 2 E.S.A. Flexible water treatment units. Number 1 for Brabantse Delta stands on the front site of the property and number 2 for Rijkswaterstaat is standing on the back. The project what you see on the photo belongs to number 2. The E.S.A. Flexible Water Treatment Installation at van Dalen also treated rainwater. Here we use step 1, the E.S.A. Flocculation Unit. And step 2, the E.S.A. Filtration Unit. After treatment, the water may be discharged onto the surface water.