What is backflow?
Backflow is the flow of water or other liquids, mixtures, or substances into the distribution pipes of a potable water supply from any source other than the intended source. There are 2 types of backflow: backpressure backflow and back-siphonage.

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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?