Back flow occurs when water from one system flows backward into another part of the plumbing system, potentially introducing contaminants into the potable water supply. This can be caused by a change in water pressure, which can result from events like pipe bursts, heavy water usage, or even firefighting activities. Back flow poses serious health risks, as it can cause cross-contamination with hazardous substances, including chemicals, sewage, and bacteria. Plumbing codes often require the installation of backflow prevention devices to mitigate this risk. These devices include air gaps, check valves, and backflow preventers, all designed to maintain water quality and safety by preventing reverse flow.
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