Stormwater biofiltration

Engineered soil-media and plant-based bioretention systems — compact, prefabricated cells installed at curb-side inlets, parking lots and roadways — that filter sediment, nutrients and metals out of urban stormwater runoff before it reaches waterways, sold as manufactured units by dedicated stormwater-treatment producers (Contech, Convergent Water Technologies, Zenebio, Imbrium Systems, Hydro International).