Global climate change leads, among other things, to the drying up of springs and a lowering of the groundwater level, thus to water scarcity. We are also experiencing increasing industrial and agricultural contamination of water. The health of large sections of the population depends more and more on purified water.

 

Many methods are in use to achieve this goal, such as microfilters, chlorination, evaporation and recondensation, disinfection by using the UV component of solar radiation and UV-permeable containers (PET bottles, SODIS). All of these methods work, but have the disadvantage of requiring either complex equipment or being highly time and weather dependent.