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What causes a Backflow?

backflow causes
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What causes a Backflow?

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There are principally two types of backflow. One is backpressure and the other is backsiphonage. Backpressure can occur when the pressure of a non-potable source is greater than the potable (drinking) water source. The second type, backsiphonage is caused by a drop in atmospheric pressure on the drinking water side. This type of backflow is unusual but can occur if a vacuum is created when an extremely high demand is placed on the water system such as when fighting a fire.

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