Safe and readily available drinking water is a top priority in every country, regardless of their development status. Even countries with highly developed infrastructure and networks are subjected to outbreaks of disease induced by waterborne pathogens such as Legionella and E. coli. Furthermore the Robert Koch Institute has reported the likelyhood of these outbreaks to increase due to the rising temperatures and erratic weather patterns caused by climate change. (Source: EN|DE) When not properly checked and maintained, drinking water systems can provide suitable environments for the growth of these pathogens. By offering regions with little to no water flow, mild temperatures (25-45°C) and the presence of some residual nutrients, drinking water systems can provide an ideal environment for bacterial growth. This issue is made worse in the case of swimming pools or technical water systems such as cooling towers, due to the higher temperatures associated with these systems and the higher chance of pathogens entering the system.  ​ Some of these water bacteria pose a health risk to humans, e.g. Legionella, Pseudomonads, E.coli or Salmonella. According to the World Health Organization (WHO), Legionella represent the greatest health threat to humans. By inhaling contaminated aerosols (e.g. when showering), they can cause legionellosis. The dangerous Legionnaires' disease or the milder Pontiac fever are well known diseases. The number of Legionella cases is increasing drastically year after year.