Biofilters with indigenous South African plants, such as palmiet, mat sedge, soft rush, cobra lily and vleibiesie, are significantly more efficient than unvegetated soils in removing nutrients and metals pollutants from urban stormwater, Stellenbosch University (SU) researchers say. The team. https://www.engineeringnews.co.za/article/indigenous-plant-biofilters-effectively-remove-pollutants-from-stormwater-researchers-say-2021-11-26