A design for the transformation and expansion of a currently invisible, yet odorous purification installation. The new situation is high tech, clean and most of all sustainable, fitting well in its context. The ensemble is a “ground scraper” with a modest profile that leaves the podium for the classic windmill nearby. The massive cylindrical and square shapes of the bassins and buildings are welded together by an undulating landscape full of flowers, trees and water plants. Fences are replaced by expansive water surfaces.