Backflow Prevention Practice Exam

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What should be done if a backflow preventer fails a test?

Re-test it after 24 hours
Replace it immediately
Adjust the settings
Inspect the entire system

The correct answer is: Replace it immediately

When a backflow preventer fails a test, the appropriate action is to replace it immediately. A backflow preventer is crucial for protecting the potable water supply from contamination caused by reverse flow of water, which can happen due to various reasons, including a drop in water pressure or a malfunctioning device. Once a backflow preventer fails, it indicates that the device can no longer perform its primary function of preventing backflow. Continuing to use a defective backflow preventer poses a significant risk of contamination. Therefore, replacing the faulty unit ensures that the integrity of the water supply is maintained. While inspecting the entire system may seem like a necessary step after a failure, it's most effective to first replace the failed component to restore proper function rather than potentially delaying resolution. Re-testing after 24 hours or adjusting settings may not address the underlying issue, as a failed device typically needs replacement rather than mere adjustment or re-testing.