What is back-siphonage?
Back-siphonage is a form of backflow due to reduced or sub-atmospheric pressure within a water system. Back-siphonage is caused by a negative pressure (i.e., a vacuum or partial vacuum) in a public water system. The effect is similar to drinking water through a straw. Back-siphonage can occur when there is a stoppage of water supply due to a nearby fire fighting, a break in a water main, and more.

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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?