Although these systems are successful, they could take a long time to generate enough drinkable water. In pursuit of a faster-acting solution, Princeton University scientists created a low-cost flat sponge-like system that absorbs water from a lake or pond and then releases filtered water when exposed to sunlight. Implementing a solar still is one of the most popular uses of the sun t... https://www.coherentmarketinsights.com/news/spongy-filter-produces-purified-lake-water-when-placed-in-the-sun-shows-a-new-study-334