Backflow is a water condition that you want to avoid at any cost. Simply put, backflow occurs any time the flow in your water system reverses.

For example, occasionally a car will strike a fire hydrant on a street. Water will gush out of the hydrant at full water pressure, causing a huge drop in water pressure at all buildings on the block. With this drop of pressure, the direction of water flowing through pipes can actually reverse. Whenever flow reverses, there is a strong likelihood of fresh water contamination.

With all this in mind, you clearly want to avoid mixing fresh water with non-potable water. This is what backflow valve is designed to prevent.

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