What is the purpose of a backflow preventer in plumbing systems?

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The purpose of a backflow preventer in plumbing systems is to prevent the reverse flow of contaminated water into the potable water supply. This device is critical for protecting public health because it ensures that any potentially harmful substances, which may be present in non-potable water, do not contaminate the clean drinking water supply.

In many plumbing situations, such as during changes in water pressure or when there is a sudden drop in pressure, there's a risk that water could flow backward through the pipes. A backflow preventer is designed to mitigate this risk by creating a physical barrier that stops contaminated water from entering the clean supply, thereby maintaining the integrity of potable water and adhering to health regulations.

This functionality is vital in settings where cross-connections might occur, such as near irrigation systems, industrial processes, or fire suppression systems, where non-potable water could easily come into contact with the drinking water supply. The effectiveness of the backflow preventer in safeguarding against contamination is why it plays a crucial role in plumbing and water safety standards.

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