At KWR, Edwin works as a researcher and team leader of the microbial water quality and health (MWG) team. There, he works on blue-green algae and the microbiological quality of swimming water. At KWR, he advises surface water authorities and water pipeline companies on microbial and ecological health risks posed by things including toxins such as those that can be produced by blue-green algae and other harmful micro-organisms. Essential in his work are molecular microbial methods (DNA techniques) for application in swimming water management. Edwin was involved in putting together over 260 swimming water profiles, of which the majority was carried out for RWS. Edwin is co-founder of protocols for the construction of a blue-green algae profile which is part of the swimming water profiles and was involved in the blue-green algae QuickScan in order to quickly count them under a microscope. Recently, Edwin helped water managers detect sources of faecal pollution with the use of DNA techniques developed by KWR.