Kitchen and bathroom

Clean a removable faucet aerator when one tap flows poorly

Check whether the outlet screen is restricted, preserve its parts, and test the result. One weak faucet differs from low flow throughout the home.

By Repair Robin · Updated 2026-10-08 · About 20 minutes hands-on

What you’ll need

• The faucet's aerator removal and cleaning instructions
• A small tray and soft cloth
• A clean soft toothbrush
• The exact aerator key, if required
• White vinegar only if permitted for this aerator's materials

Before you start

Allow extra time for any approved soak. Check finish-care instructions before using vinegar; keep it off sensitive counters and never mix cleaners.

Keep the faucet handles off during removal and ask others not to use it. This outlet-only task does not disconnect hoses, open the faucet body or operate under-sink valves.

Step by step

1. Identify the outlet before turning anything

   Match the outlet to its instructions. An exposed shell may unscrew by hand; a recessed round insert may require a specific key. Stop if removal is unclear or requires prying or disassembly beyond the outlet. Photograph it first.

2. Catch small parts and remove the aerator gently

   With water off, close the drain and set a tray nearby. Follow the specified removal direction by hand or with the matching key. Stop if the faucet twists, the key slips or substantial force is needed. Do not crush the shell with pliers.

3. Preserve the washer and check the flow

   Look for a washer left against the spout. Arrange loose pieces in removal order; do not force sealed inserts apart. Put parts safely aside, reopen the drain and briefly run gentle cold water. Turn it off. Persistently weak flow without the aerator suggests another restriction.

4. Rinse debris and treat only permitted deposits

   Rinse and gently brush the removed aerator. Do not pierce screens or remove flow-control parts. For mineral deposits, use the exact part's approved cleaner and soak time. Delta permits vinegar for its aerators, not necessarily every brand or finish. Rinse thoroughly.

5. Reassemble without forcing the threads

   Restore the pieces and washer using your photograph and model diagram. Replace damaged parts with specified equivalents. Start squarely; if threads bind, back off and realign. Follow the tightening instructions. Do not substitute tape or sealant for a washer.

6. Test both the stream and the joint

   Start with gentle cold flow, then test normal operation without touching potentially hot water. Dry the joint and watch for leakage around the aerator. Compare the stream with your starting observation and store the key with the instructions.

If it’s not working

Water leaks around the reinstalled aerator

Turn the tap off. Check washer placement and thread alignment, not tighter force. Replace damaged seals or threads with matching parts.

Flow improved without the aerator but cleaning did not help

Check assembly order and insert condition. Ask for a replacement with the correct thread and rated flow; do not drill the restriction.

A clean screen made no difference

Record whether hot, cold or both are affected and seek model-specific support. Do not disconnect supply lines or remove cartridges.

Check your result

• The original screens, flow-control parts and correct washer are present.
• The stream is usable and the aerator joint stays dry during the test.
• If the symptom remains, you have recorded the before/after result instead of assuming the repair worked.

Where this guide stops

• No faucet-body, cartridge, supply-valve or concealed-filter repair is included.
• A new faucet's designed flow limit is not a blockage to remove. Do not promise that cleaning increases household water pressure.