Scientists at the Department of Energy’s (DOE) Argonne National Laboratory have developed a light-activated coating for filtration membranes—the kind used in water treatment facilities, at semiconductor manufacturing sites and within the food and beverage industry—to make them self-cleaning, eliminating the need to shut systems down in order to repair them.

Cheap and effective, water filtration membranes have been around for years but have always been vulnerable to clogging from organic and inorganic materials that stop up its pores over time, a phenomenon known as fouling.

“Anything you stick in water is going to become fouled sooner or later,” said Argonne senior scientist Seth Darling.