Backflow
Unwanted reverse flow of water / From Wikipedia, the free encyclopedia
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Backflow is a term in plumbing for an unwanted flow of water in the reverse direction.[1] It can be a serious health risk for the contamination of potable water supplies with foul water. In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl. For this reason, building codes mandate a series of measures and backflow prevention devices to prevent backflow.
This article is about backflow in plumbing. For backflow in the circulatory system (AKA reflux), see regurgitation (circulation). For various other types of biological backflow, see reflux (disambiguation).