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Drinking water normally carries small amounts of bacteria. Health hazards typically occur only when the bacteria multiply. In conventional piping systems, a layer of biofilm forms over time. This biofilm acts as a breeding ground for bacterial growth. Bacterial growth is especially likely in standing water, where insufficient water consumption occurs. This is a typical problem in schools, hospitals, hotels and other buildings where water use is inconsistent. Standing water allows bacteria to attach to the biofilm, which results in exponential bacteria growth. BQ Rohrsysteme has developed B.Clean Technology to combat this problem. BQ-Cleanpipes contain an antibacterial layer which prevents the formation of the biofilm and kills bacteria in the drinking water.