<http://schema.org/description>
"Cheap, simple water filters made of plant xylem could dramatically reduce the incidence of water-borne diseases in places without access to clean drinking water, say engineers."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.technologyreview.com/s/520706/how-to-build-a-plant-xylem-water-filter/>