Texas A&M Engineering water purification (IMAGE) Texas A&M University Caption Researchers used a green laser on a jar filled with water to show how the water moves and how contaminants clump together. Credit Dr. Kuang-An Chang, Texas A&M Engineering Usage Restrictions use with credit 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.