Water filtration by Matthew Modoono January 5, 2022 Share Facebook LinkedIn Twitter Jackie Helliwell, who studies environmental engineering, filters stormwater samples for copper and zinc material in the Egan Research Center. Photo by Matthew Modoono/Northeastern University Jackie Helliwell, who studies environmental engineering, filters stormwater samples for copper and zinc material in the Egan Research Center. Photo by Matthew Modoono/Northeastern University