Hydrogels 1 (IMAGE) University of Texas at Austin Caption A hydrogel tablet developed by engineers at The University of Texas at Austin can purify a liter of river water in an hour or less. Credit The University of Texas at Austin 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.