Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context - Wintgens, Thomas; Nattorp, Anders; Elango, Lakshmanan; Asolekar, Shyam R.; Lakshmanan, Elango; Wintgens, Thomas; Asolekar, Shyam R.; Elango, Lakshmanan; Nattorp, Anders (London GB IWA Publishing, 2016)