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What is a backflow?

April 26, 2017backflow

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What is a backflow?

3 Answers

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There are actually two type of backflow: 1) back pressure, and 2) back siphonage. Back pressure occurs when the non-potable source pressure exceeds the potable water pressure. Back-siphonage occurs when the supply line pressure falls below atmospheric pressure (14.7 PSI at sea level).

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Backflow is the undesirable reversal of flow of non-potable water or other substances through a cross-connection and into the piping of a public water system or consumer’s potable water system. There are two types of backflow- back pressure and back siphonage.

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Backflow occurs when the flow of water changes directions, usually because of a change in pressure. This is a potentially dangerous situation because untreated or nonpotable (not safe for human consumption) water can be sucked back into the drinking water system and contaminate it. For example, backflow can happen if the flow from a hose in a bucket of water containing soap or household chemicals reverses because of a change in pressure, pulling the water from the bucket into your home’s drinking water system.