What is backpressure backflow?
Backpressure backflow is a form of backflow due to pressure created by mechanical means or other means which causes water or other liquids or substances to flow or move in a direction opposite to that which is intended. Backpressure backflow is caused by a downstream pressure that is greater than the upstream or supply pressure in a public water system. Backpressure can result from an increase in downstream pressure, a reduction in the potable water supply pressure, or a combination of both.

Causes of increases in downstream pressure: Pumps (such as wells and booster pumps), elevated tanks, temperature increases in boilers, etc.

Causes of decreases in downstream pressure: Water line flushing, fire fighting, or breaks in water mains.

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1. What is backflow?
2. What is backpressure backflow?
3. What is back-siphonage?
4. What is a backflow preventer?
5. Why does a soft drink dispensing machine require backflow protection?