LESS Coating (VIDEO) Penn State This video is under embargo. Please login to access this video. Caption Penn State researchers have developed a method that dramatically reduces the amount of water needed to flush a conventional toilet -- a bio-inspired, liquid, sludge- and bacteria-repellent coating that can essentially make a toilet self-cleaning -- described in a paper in Nature Sustainability. Credit Wong Lab, Penn State Usage Restrictions Non commercial use only 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.