Heat-Sink like Photothermal Evaporator (IMAGE) University of South Australia Caption UniSA's photothermal evaporator is a cost-effective water purification technique that could deliver safe drinking water to millions of vulnerable people using cheap, sustainable materials and sunlight. Credit University of South Australia 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.