Modelling of natural water treatment systems in India: Learning from the Saph Pani case studies - Kloppmann, W.; Sandhu, C.; Groeschke, M.; Pandian, R.S.; Picot-Colbeau, G.; Fahimuddin, M.; Ahmed, S.; Alazard, M.; Amerasinghe, Priyanie H.; Bhola, P.; Boisson, A.; Elango, L.; et al. (2015)