-The biofilm produced will generally present itself as a black slime that, in certain cases, can be flushed out.-In branchlines, the presence of air gaps in wet systems or undrained water in dry pipe systems is believed to be a contributing factor -In risers, the higher exposure to oxygenation compared to other parts of the system is believed to be a contributing factor.Insert new calc slides after this slide.More $ for lab buildings/fire pumps Trade-ups: unrated wall/ceiling/door construction,.
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