An aerator mixes and shapes the water stream at the end of a faucet. A partly blocked screen can make that stream weak or uneven while other fixtures remain normal. Cleaning it is a useful local check, not a treatment for low pressure throughout the house.
In this guide
Tools and preparation
- Small bowl.
- Soft brush.
- Towel.
- Any aerator key specified for the faucet.
Check the exact finish-care instructions before choosing a cleaner.
Time is a planning estimate, not a timed field test. Material prices vary; check the correct parts and local prices before buying.
Steps and safe checks
1. Compare other outlets
Check another faucet and compare hot and cold flow at the affected one. If several fixtures are weak, or only one supply temperature is affected, the problem may be upstream of the aerator.
2. Identify the removable part
Look up the faucet model. Some aerators unscrew by hand; recessed models can need a dedicated key. Cover the drain so a small gasket cannot disappear, and photograph the parts as they come apart.
3. Clean without damaging the finish
Rinse loose debris from the removed aerator. Brush the screen gently. Use a vinegar treatment only when the manufacturer permits it for that part and finish; follow its dilution and contact-time guidance.
4. Reassemble and test
Put the screen and gasket back in their original order. Refit the aerator according to the model instructions, then open the faucet gradually and check for leakage around its connection.
Check the result
A more even stream supports an aerator restriction as the cause. If flow remains low, record whether hot, cold or both are affected and seek further diagnosis.
Common mistakes
Do not remove water-saving inserts to increase flow. Overtightening can distort a gasket or damage threads, and a general-purpose descaler can mark specialty finishes.
When to call a professional
Get help with seized parts, damaged threads, leaks from the faucet body or a sudden pressure change affecting the whole home.
What can happen if you postpone it?
A blocked aerator can leave an uneven stream or poor flow. If other fixtures are also affected, repeatedly cleaning this one part can delay investigation of a wider supply problem.
Prevent a repeat
Clean when the flow changes, and keep the model number and key together. Inspect the stream after plumbing work that could release debris.
Sources and scope
Source check: November 4, 2026. AI-assisted educational writing checked against the linked documentation; no firsthand testing or licensed professional review is claimed. Manufacturer instructions and applicable local requirements take priority.