Looks like it's reusable. You use a magnet to collect the powder and it goes into more dirty water again. "Disinfectant powder is stirred in bacteria-contamina

Looks like it's reusable. You use a magnet to collect the powder and it goes into more dirty water again. "Disinfectant powder is stirred in bacteria-contaminated water (upper left). The mixture is exposed to sunlight, which rapidly kills all the bacteria (upper right). A magnet collects the metallic powder after disinfection (lower right). The powder is then reloaded into another beaker of contaminated water, and the disinfection process is repeated"