Cal-Sag and Calumet River - (IMAGE) University of Chicago Caption Sidestream Elevated Pool Aeration station in Cal-Sag and Calumet River Credit credit MWRD.jpg 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.