Sand Filters (IMAGE) University of Toledo Caption The lab-scale biofilters used during Dr. Jason Huntley's research at The University of Toledo are sand filters that contain biologically active bacteria that break down microcystin toxins. Credit Dr. Jason Huntley, The University of Toledo Usage Restrictions None License Licensed content 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.