Increasing population uses more ressources incl. Water. Animals, plants and ecosystems are suffering more and more. Wetlands are specially affected. Engineers and environmentalists created the concept of “constructed wetlands”, which are man-made and intended to function in the same manner as a natural wetland. Such “conctructed wetlands” provides habitats for various species, helps to recycle flood water, treats wastewater producing e.g. water for agregation.