Dune Filters During Installation (image) North Carolina State University Caption The NC State researchers designed and built two dune filtration systems in Kure Beach, N.C. The systems consist of large, open-bottomed chambers that effectively divert stormwater into dunes, which serve as giant sand filters that remove microbial contaminants from the stormwater. Credit Michael Burchell, North Carolina State University Usage Restrictions Photo credit must be given. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.