Water is a rare commodity. Even though we call Earth "the blue planet" because much of its surface is covered by sea, the proportion of freshwater, and particularly clean water, is very low, at a figure of 0.3%. Furthermore, the demand for clean water is increasing. The aim of water purification is to produce drinking water, as well as clean service water and process water for industry and business. The untreated water comes from the sea or from groundwater wells, but also from surface waters, such as lakes and rivers. In times of increasingly scarce water resources, the recycling of service and sewage water becomes even more significant.
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