Stop backflow nightmares! a step-by-step guide to blowing out your backflow preventer

Backflow preventers are essential devices in plumbing systems, preventing contaminated water from flowing back into the clean water supply. However, over time, these preventers can become clogged with debris, leading to reduced water flow or even system failure. Blowing out the backflow preventer is a crucial maintenance procedure to restore its functionality and prevent costly repairs.

Understanding the Backflow Preventer

A backflow preventer is a mechanical device installed in the plumbing system to prevent water from flowing in the wrong direction. It consists of a check valve that allows water to flow in one direction but closes when the flow reverses.

Signs of a Clogged Backflow Preventer

• Reduced water flow from faucets or appliances
• Gurgling or sputtering sounds coming from the plumbing system
• Water hammer (loud banging noises in the pipes)
• Water discoloration or foul odor

Materials Required

• Water hose with a nozzle
• Bucket or drain pan
• Wrench (optional)

Safety Precautions

• Wear eye protection and gloves.
• Shut off the water supply to the backflow preventer before starting.
• Release any residual water pressure in the system by opening a faucet.

Step-by-Step Blowout Procedure

1. Locate the Backflow Preventer:
Identify the backflow preventer in the plumbing system. It is typically found near the water meter or where the main water line enters the building.

2. Shut Off Water Supply:
Turn off the water supply valve to isolate the backflow preventer.

3. Release Water Pressure:
Open a faucet or hose bib to release any remaining water pressure in the system.

4. Attach Water Hose:
Connect the water hose to the test cock or hose bib on the backflow preventer.

5. Open Test Cock:
Slowly open the test cock to allow water to flow through the hose.

6. Blow Out Debris:
Increase the water pressure from the hose and direct the water into the backflow preventer. This will help dislodge any debris or clogs.

7. Flush the System:
Continue flushing the backflow preventer for several minutes or until the water runs clear.

8. Close Test Cock:
Once the water is clear, close the test cock.

9. Reopen Water Supply:
Slowly reopen the water supply valve to the backflow preventer.

10. Check for Leaks:
Inspect the backflow preventer and surrounding area for any leaks. If leaks are present, tighten the connections or call a plumber for assistance.

Additional Tips

• If the backflow preventer is heavily clogged, you may need to use a wrench to remove the test cock and clean it manually.
• If the blowout procedure does not resolve the issue, it may be necessary to replace the backflow preventer.
• Regular maintenance, including periodic blowouts, can help prevent clogs and extend the life of the backflow preventer.

Conclusion: Maintaining Backflow Preventer Health

Blowing out the backflow preventer is a crucial maintenance task that helps ensure the proper functioning of your plumbing system and prevents costly repairs. By following these steps and adhering to regular maintenance, you can keep your backflow preventer clear of debris and protect your water supply from contamination.

Quick Answers to Your FAQs

Q: How often should I blow out my backflow preventer?
A: It is recommended to blow out your backflow preventer annually or as per the manufacturer’s guidelines.

Q: Can I blow out a backflow preventer without a water hose?
A: No, a water hose is necessary to provide sufficient water pressure to dislodge the debris.

Q: What should I do if my backflow preventer is still not working after blowing it out?
A: If the blowout procedure does not resolve the issue, it may be necessary to replace the backflow preventer or contact a plumber for further troubleshooting.