Yes, xylem filters have been tested with water from natural springs, tubewells (groundwater), and municipal taps in India. Filters made from Ginkgo Biloba (ginkgo) and Pinus roxbhurghii (chir pine) with 4 cm diameter and 1 cm thickness operated under a 1 meter gravity head and were able to process at least 10 L of water and showed complete removal of coliform (bacteria) in most cases.