Quick Answer:
If your faucet aerator or pull‑out sprayer suddenly collapses to a weak, narrow stream, the first checks are to remove the aerator and look for debris, test the raw stream, and verify the pressure regulator (PRV) behavior while the fixture is flowing. The problem is often debris or an unstable PRV setpoint, not the faucet itself.
Why This Happens
Two common causes produce a collapsed spray pattern and weak feel:
- Sediment or mineral debris trapped in screens (aerator, sprayer hose, or at the PRV). Debris can break loose and reappear until the upstream source is cleared.
- An unstable or failing PRV that drops pressure under flow or releases debris when it shifts. A PRV that is stuck, worn, or set incorrectly can cause intermittent weak flow at one or more fixtures.
If the same symptom shows up across multiple fixtures, that points more strongly at the PRV. For a single faucet, check the faucet parts first but don’t stop there if debris is returning.
Step-by-Step What to Do
Step 1 — Remove the aerator or sprayer head and test the raw stream
- Unscrew the aerator or pull the sprayer head off and run the faucet. Observe the raw stream from the spout.
- A steady, full raw stream from the spout with poor aeration points to a clogged aerator. A weak raw stream suggests an upstream restriction.
Step 2 — Check for debris caught in screens
- Inspect and clean the aerator screen and any small filters in the sprayer head. Use a soft brush and water; avoid harsh tools that could damage threads.
- Collect any grit or sediment; if you find a lot, it may be coming from upstream rather than the faucet.
Step 3 — Verify PRV setpoint while flowing
- Have someone run the faucet while you observe the system pressure gauge near the PRV or meter (if you have one). Watch how the pressure behaves as the fixture flows.
- If the pressure drops suddenly, fluctuates, or the PRV shifts under flow, the regulator may be unstable or stuck and affecting the faucet’s flow pattern.
- Note the PRV setpoint and whether it holds steady while water runs; this is the key diagnostic for PRV instability.
Step 4 — Clean the PRV screen and flush the line if debris keeps returning
- If debris keeps showing up after cleaning the aerator, shut off the main, relieve downstream pressure, and open the PRV housing (or the PRV screen access) per the manufacturer instructions to inspect the screen.
- Flush the line downstream of the PRV to clear remaining sediment. Replace or reinstall the screen and slowly restore pressure, watching for return of debris.
- If debris continues to appear, the source may be corrosion or a failing component upstream that a plumber should evaluate.
Step 5 — Reassemble and test
- Reinstall the aerator or sprayer head, then run the fixture and other nearby fixtures to confirm steady flow and consistent spray pattern.
- Monitor over a few days; intermittent debris or pressure shifts suggest a PRV or upstream issue that needs further attention.
What Not to Do
- Don’t clean only the faucet head if debris is coming from upstream/PRV. That will temporarily mask the symptom while the real source continues to send grit back into the faucet.
- Don’t force or pry PRV parts without shutting off water and relieving pressure. PRVs contain springs and components that can release suddenly.
- Don’t use strong chemical cleaners inside the PRV or supply lines; those can damage seals and worsen the problem.
When to Call a Professional
- Persistent debris after cleaning the aerator and PRV screen.
- PRV setpoint does not hold steady or pressure fluctuates noticeably while fixtures run.
- You’re uncomfortable opening the PRV or you lack a pressure gauge. A licensed plumber can test, adjust, or replace the PRV and safely flush the service line.
For system‑wide pressure complaints or repeated regulator issues, consider a full PRV inspection or replacement rather than repeated cleaning.
Safety Notes
- Shut off the main water supply and relieve pressure before disassembling a PRV or other pressurized parts.
- Use hand tools sized correctly for fittings; avoid damaging threads and seals.
- If you don’t have a pressure gauge or are unsure how to operate the PRV, call a professional. Working on the mains or regulator incorrectly can cause leaks or loss of control of house pressure.
Common Homeowner Questions
- Q: How do I know if the PRV is the problem?
A: If multiple fixtures have weak flow or the system pressure drops while running a fixture, the PRV is likely involved. - Q: Can I replace a PRV myself?
A: You can if you are comfortable shutting off the main, have the right tools, and follow instructions; otherwise hire a plumber. - Q: Will cleaning the aerator stop the problem permanently?
A: Only if the aerator was the sole source of debris; recurring grit usually means an upstream or PRV issue.
If you want more on system‑wide effects and diagnosis, see PRV causing low water pressure everywhere for broader troubleshooting steps.