Landscape architecture and planning professor, Marina Bergen Jensen, from the University of Copenhagen, has patented a new urban stormwater filtration system that does not use any power or chemicals. It features a double porosity filter that was tested on smaller applications before being implemented into an actual wastewater treatment plant.

The new treatment method is able to clean 110 liters of storm runoff water every second and is currently being used in a large wastewater treatment facility in ???????????<
Jensen's filtration system consists of a "sandwich-type filter" that cleans water as it passes through it. As gravity pulls the water through the filtering membrane, small pollutants and particles become trapped while the clean water continues through.

An article by StormwaterOne.com states, "The new stormwater runoff treatment facility is a major win for nature and the climate... no power or chemicals are used by the facility and it operates without any odor or noise pollution."

The filter is not suitable enough yet for cleaning water for human consumption, but Jensen is currently researching how to further improve the technology. A Danish company named WaterCare currently manufactures and distributes Jensen's filter.