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Bacterial growth on surfaces in contact with water (a phenomenon usually known as “biofilm”) is a major problem in water distribution networks. Indeed, such bacterial layer is the ideal environment for the proliferation of pathogens. Moreover, biofilm is much more resistant (up to 1000x) to biocides and sanitation than free-floating bacteria, and its resistance increases with time. For this reason, to prevent the proliferation of harmful microorganisms, it is important to eliminate biofilm during its initial phase of development. Chlorine is usually dosed in drinking water to limit bacterial growth but, in most cases, its real effectiveness against biofilm is not checked.

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