The overall aim of this book is to present default values for the micro-organisms elimination or inactivation credit of universally used processes in water treatment (MEC or MIC). These MEC or MIC values have been calculated from international literature data which revealed a high variation in capacities or logremoval. The parameters and process control parameters affecting the presented capacities are described. This new edition describes the state-of-the-art progress in research on conventional treatment, coagulation and flocculation, rapid granular filtration, slow sand filtration and UV disinfection. This title belongs to KWR Watercycle Research Institute Series