Catherine Mulligan and Antonion Pereira (IMAGE) Concordia University Caption Catherine Mulligan and Antônio Pereira: “We did not add any chemicals to the lake, but we still managed to get good results: algae suppression and turbidity decreases for an entire recreational season.” Credit Concordia University Usage Restrictions None License Original 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.