Introduction water disinfection
Figure 1: decrease in the number of deaths as a result of typhoid in the USA (1900-1920), compared to the number of people that use treated water
In developing countries there is usually not enough clean drinking water or sewerage. In these countries waterborne diseases cause many people to be ill or to die, mainly fragile groups such as young children, elderly people and people with a weakened immune system (AIDS patients and organ transplant receivers).
More information on water disinfection?:
What is water disinfection? Necessity of drinking water disinfection History of water disinfection Waterborne diseases Factors that influence disinfection Conditions of water disinfection Regulation drinking water disinfection EU USA