How to Clean a Faucet Aerator: Remove Mineral Buildup and Restore an Even Flow

If your faucet suddenly has a weak stream, sprays sideways, or produces several uneven jets instead of one smooth flow, the aerator is one of the first places worth checking. An aerator is the small screen-and-insert assembly at the end of many faucet spouts. It mixes air into the water and shapes the stream, but over time it can collect sand, pipe debris, and mineral deposits.

There has not been a major recent change to the basic cleaning method. Current manufacturer guidance still centers on identifying the aerator type, removing it correctly, rinsing debris, dissolving mineral scale when appropriate, and reinstalling it without damaging the faucet finish. What has become more important is recognizing that modern faucets use several aerator designs. Moen's current service guidance, for example, distinguishes exposed aerators, concealed aerators that need a removal key, and faucets with no serviceable aerator at the spout at all. See Moen's faucet aerator cleaning guide.

What should you check before removing the aerator?

First, confirm that the symptom is actually at the outlet. Turn the faucet on and watch the stream. If the water is strong but sprays unevenly, the aerator is a likely suspect. If both hot and cold flow are very weak, cleaning the aerator is still a sensible first step, but the restriction may also be in a supply line, cartridge, valve, or an in-line filter.

Delta explains that debris trapped in an aerator can reduce water pressure or make the stream come out at an odd angle. Moen likewise notes that debris and mineral deposits can restrict flow or distort the spray pattern. See Delta's official flow troubleshooting guide.

Do all faucet aerators come off the same way?

No. This is the main reason not to reach for pliers immediately.

• Exposed threaded aerator: a visible metal or plastic housing screws onto or into the end of the spout.
• Concealed or cache-style aerator: the insert sits inside the end of the spout and usually requires a small plastic key or model-specific removal tool.
• Non-accessible outlet: some faucets do not have a serviceable aerator at the tip. Moen documents designs that instead use in-line filters at the supply lines.

Thread direction can also vary with design and viewing orientation. Delta's general guide says many conventional aerators unscrew counterclockwise by hand, while Moen's current service table gives different directions for some male- and female-threaded versions. If the part does not move with reasonable hand pressure, stop and identify the faucet or aerator type rather than forcing it.

Do you need to shut off the water supply?

For a simple removable aerator at the tip of a standard manual faucet, Delta says the water supply does not need to be shut off; the faucet handle simply stays in the off position while you work. That does not apply to every design. Sensor faucets, in-line filters, and service work involving supply lines may require the shutoff valves to be closed.

If you are unsure whether the part you are about to remove is only the aerator, close the under-sink supply valves or consult the model instructions first. Never disconnect a supply line under pressure.

What do you need?

• A towel or sink stopper so small pieces do not fall into the drain.
• The aerator key supplied with the faucet, if yours is concealed.
• A soft cloth to protect the faucet finish.
• An adjustable wrench or pliers only if the manufacturer allows them and hand removal fails.
• A small bowl.
• White vinegar and clean water for mineral deposits when approved for the aerator material.
• A soft toothbrush.
• A clean towel for drying and organizing parts.

Avoid steel wool, metal picks, harsh abrasive pads, and strong acids. Faucet finishes can be scratched or chemically damaged. Kohler's care instructions call for mild detergent and warm water on faucet surfaces and warn against abrasive cleaners, while Delta advises thoroughly rinsing vinegar solution from the faucet finish after use.

How to clean a faucet aerator step by step

1. Protect the sink and note the aerator's original position

Close the drain or place a towel over it before taking anything apart. Aerators often contain a small rubber gasket, screen, flow-control insert, and housing. Those pieces are easy to drop.

Take a quick photo with your phone before disassembly if the insert has multiple layers. The exact order matters because the gasket must seal correctly and the flow elements must face the right direction.

2. Remove the aerator without damaging the finish

Try hand removal first on a conventional exposed aerator. If you must use pliers, wrap the housing with a cloth and use only enough pressure to break it loose. Delta specifically warns that excessive force can deform an aerator into an oval shape.

For a concealed aerator, use the matching key. Moen states that concealed aerators generally require the supplied removal tool or one from the service kit. Do not jam screwdriver tips into the slots; damaged plastic tabs can make later removal much harder.

3. Separate the parts and inspect them

Separate the components only as far as the design allows. Look for white or greenish mineral scale, grains of sand, small flakes of plumbing material, or damaged plastic. Delta notes that particles left from plumbing work can become caught in aerators, especially after water has been shut off for repairs.

If the rubber gasket is cracked, the mesh is torn, or the plastic flow insert is broken, cleaning may not solve the problem. Replacement is more appropriate than trying to reshape damaged parts.

4. Rinse loose debris first

Before using vinegar, rinse the removable pieces under clean running water. Hold the screen so debris can wash back out rather than being driven deeper into it. A soft toothbrush can loosen grit trapped in the mesh.

This step may be all that is needed after recent plumbing work. Moen installation instructions for some models tell users to remove the aerator and flush the open faucet for about 15 seconds before reinstalling it, while some Kohler instructions specify a longer flush for particular products. Follow your model's installation sheet if you are flushing debris from newly serviced plumbing.

5. Soak mineral-covered parts in vinegar solution when approved

For stubborn mineral deposits, manufacturer instructions commonly use white vinegar. Delta recommends vinegar soaking for aerator deposits and, on some specific aerator support pages, a 50/50 mixture of white vinegar and water. Kohler likewise specifies a 50:50 water-and-vinegar soak for the plastic insert on certain faucets. See Delta's cleaning and care FAQ and Kohler's faucet troubleshooting and care instructions.

Do not assume that longer or stronger is always better. Some Delta guidance permits overnight soaking, while other product-specific instructions use a 50/50 solution. If your faucet manual gives a concentration or time, use that instruction. For decorative metal finishes, avoid immersing the finished faucet body unless the manufacturer specifically permits it.

6. Gently brush away softened scale

Brush the screen and flow channels lightly. The goal is to free the original openings, not make them larger. Do not push a drill bit, needle, or metal wire through calibrated openings; changing their size can alter the aerator's flow pattern and rated performance.

If hard scale remains after one soak, repeat the manufacturer-approved treatment rather than scraping aggressively. Replace the aerator if the insert remains blocked, brittle, cracked, or deformed.

7. Rinse every part thoroughly

Rinse until there is no loose sediment or vinegar odor. Delta's finish-care guidance specifically says vinegar solution should be rinsed thoroughly with water afterward.

While the aerator is off, you can briefly flush the faucet spout if your model's instructions call for it. Keep the sink clear because the open stream may splash more than usual without an aerator installed.

8. Reassemble the aerator in the same order

Put the screen, insert, and gasket back exactly as they came out. Start the threads by hand to avoid cross-threading. On common exposed aerators, Delta recommends hand-tightening rather than cranking down with a wrench; that also makes the next cleaning easier.

For a concealed aerator, use the proper key only until the insert is seated according to the faucet instructions. Excess torque can damage the plastic insert or the threads inside the spout.

9. Turn on the faucet and judge the result

Run both cold and hot water. Look for an even stream, less side spray, and normal flow. Also check the seam around the aerator for leakage. If it drips around the edge, turn the faucet off and check that the gasket is present, flat, and correctly seated.

What if the aerator will not come off?

Do not keep increasing force. First decide whether it is actually an exposed threaded aerator. A concealed unit may need a key, while some faucets have no removable tip aerator at all.

For a mineral-stuck conventional aerator, Delta suggests wrapping the end of the spout with a white-vinegar-soaked cloth for a period of time to soften deposits before trying again. Protect the finish and follow the faucet maker's chemical-contact limits. If the housing begins to deform, stop.

What if the water flow is still low after cleaning?

A clean aerator rules out only one restriction point. If the stream is still weak, compare hot and cold flow and consider the rest of the faucet system. Delta's maintenance documents list debris in the cartridge as another possible cause of very low flow, while Moen directs owners to model-specific low-flow troubleshooting if aerator service does not fix the problem.

Possible next checks include:

• A partially closed under-sink shutoff valve.
• A kinked flexible supply hose.
• Debris in the faucet cartridge.
• An in-line filter used on some faucet designs.
• A pull-down spray wand screen or hose restriction.
• Low pressure affecting more than one fixture in the home.

If only one faucet is affected and cleaning the aerator changes nothing, the next step should be model-specific troubleshooting rather than a stronger acid soak.

How often should you clean a faucet aerator?

There is no single manufacturer interval that fits every home. Hard-water areas can build scale quickly, while soft-water systems may go much longer between cleanings. Clean the aerator when the stream becomes uneven, flow noticeably falls, visible scale appears, or plumbing work sends debris through the lines.

It is also sensible to inspect the aerator after water service has been shut off for repairs. Delta notes that small particles from pipe work can be flushed into aerators when service resumes.

How do you know the cleaning worked?

Bottom line

Cleaning a faucet aerator is usually a small maintenance job, but identifying the aerator correctly matters more than using force. Start by checking the flow pattern, determine whether the aerator is exposed, concealed, or non-accessible, remove it with the correct method, rinse loose debris, use manufacturer-approved vinegar treatment for mineral scale, brush gently, rinse thoroughly, and reinstall the parts in their original order.

If the faucet still has low flow after the aerator is clean, stop repeating the same cleaning step. The restriction may be in a cartridge, supply line, filter, or spray assembly and should be diagnosed using the instructions for that exact faucet.

Sources checked September 11, 2026. Faucet aerator designs, removal directions, chemical-contact limits, and service procedures vary by model, so product-specific manufacturer instructions should override general guidance.