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What causes backflow in a plumbing system?
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Related Questions:
What is backflow plumbing? How do I schedule testing for my backflow prevention device? Should I install a Backflow Preventer on a Water Heater? How do I size a water heater for my home?
 
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Backpressure and or backflow occurs in plumbing pipes when the pressure of the nonpotable water system exceeds the pressure of the potable plumbing system side of the water system. This problem is extremely dangerous. [edit]
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