How to Clean a Faucet Aerator
Learning how to clean a faucet aerator is one of the simplest plumbing fixes a homeowner can do, and it solves one of the most common household annoyances: weak or sputtering water flow. The aerator is the small mesh screen screwed onto the tip of your faucet. It mixes air into the water stream, reduces splashing, and saves water. Over time, minerals, sediment, and debris clog that screen, and your faucet slows to a trickle. The good news is that cleaning it takes about 15 minutes, requires no plumber, and costs almost nothing.
What Is a Faucet Aerator?
A faucet aerator is a small assembly, usually about the size of a dime, that threads into or onto the end of your faucet spout. Inside the housing sits a fine mesh screen, a flow restrictor, and sometimes a washer. The screen breaks the water stream into many tiny streams and mixes in air, which makes the flow feel fuller while actually using less water. Most modern kitchen and bathroom faucets use aerators rated at 1.5 or 2.2 gallons per minute.
Aerators come in two main styles. Male-threaded aerators screw into the faucet spout, while female-threaded aerators screw onto the outside of the spout. Knowing which type you have matters when you buy a replacement, but for cleaning, the process is the same either way. Some newer faucets also have hidden or recessed aerators that require a special key, usually included with the faucet or available from the manufacturer. If you are unsure which faucet style you have, our faucets and fixtures hub and our comparison of single handle vs double handle faucets can help you identify your fixture.
Signs Your Aerator Needs Cleaning
The most obvious sign is reduced water pressure at one faucet while the rest of the house flows normally. If only the kitchen faucet is slow, the aerator is almost certainly the culprit. Other signs include a stream that sprays sideways, sputters, or splits into uneven jets, or visible white or green crust around the faucet tip.
Hard water makes clogging worse. Calcium and magnesium deposits build up on the mesh screen, narrowing the openings until water can barely pass through. Sediment from municipal water work or a well system can also lodge in the screen. If you notice the problem getting worse over weeks rather than appearing suddenly, mineral buildup is the likely cause. A sudden drop in pressure at every faucet points to a different problem, such as a supply issue, and cleaning one aerator will not fix it.
Tools You Will Need
You need very little for this job. Gather a pair of adjustable pliers, a cloth or rag to protect the finish, white vinegar, a small bowl or cup, an old toothbrush, and a towel. That is the complete list. Do not use pipe wrenches or channel-lock pliers without a cloth barrier, because they can scratch or dent the faucet finish, especially on chrome or matte black fixtures.
If your faucet has a hidden aerator, you will also need the aerator key that came with the faucet. Check the original packaging or the manufacturer website if you no longer have it. Replacement keys are inexpensive and widely available. Having a small container to hold the tiny parts is also smart, because aerator screens and washers are easy to lose down the drain. Plug the drain or lay a towel over it before you start.
Step-by-Step: Removing the Aerator
Start by turning off the faucet and plugging the drain. Try unscrewing the aerator by hand first. Grip the aerator housing at the tip of the spout and turn it counterclockwise. Many aerators come off easily by hand, especially if they were installed recently. If it will not budge, wrap a cloth around the aerator to protect the finish, grip it gently with pliers, and turn counterclockwise until it loosens, then finish by hand.
Once the aerator is off, pay attention to the order of the parts as they come out. A typical aerator contains the outer housing, a mesh screen, a flow restrictor, and a rubber washer. Lay the parts on a towel in the order you removed them, and note which side faces up. Taking a quick phone photo of the assembly before you take it apart makes reassembly much easier, especially the first time you do this job.
Cleaning the Aerator
Separate the parts and inspect them. Rinse loose debris off under running water, then place the metal parts in a bowl of white vinegar. Plain white vinegar dissolves calcium and mineral deposits effectively and safely. Let the parts soak for at least 30 minutes. For heavy buildup, an overnight soak works even better. Do not use vinegar on rubber washers for extended periods, as it can degrade the rubber over time; a quick rinse is enough for washers.
After soaking, scrub the mesh screen gently with an old toothbrush to remove any remaining deposits. Use a toothpick or a pin to clear individual holes in the screen if they are still blocked. Rinse everything thoroughly under clean water and hold the screen up to the light to check that the holes are open. If the screen is torn, bent, or corroded through, cleaning will not restore it, and replacement is the better option.
Reassembling and Testing
Reassemble the aerator in the reverse order of removal, using your photo as a guide. Make sure the washer sits flat and the screen faces the right direction. Thread the aerator back onto the faucet by hand, turning clockwise. Hand-tighten it firmly, then give it a gentle snug with pliers and a cloth if needed. Do not over-tighten, which can crack the housing or damage the threads.
Turn on the faucet and check the flow. The stream should be smooth, even, and full. Run the water for 30 seconds to flush any loosened debris, then check around the aerator for drips. A small drip usually means the washer is not seated properly or the aerator needs one more quarter-turn. If the flow is still weak after a thorough cleaning, the problem may be deeper in the faucet, such as a clogged cartridge or supply line, and that is worth a closer look.
When to Replace Instead of Clean
Cleaning fixes most aerator problems, but sometimes replacement is smarter. Replace the aerator if the screen is torn or corroded, the housing threads are stripped, the washer is cracked or flattened, or the flow stays weak after a full vinegar soak and scrub. Aerators are inexpensive, typically $3 to $15 at hardware stores, and universal replacement kits cover most faucet brands.
When buying a replacement, bring the old aerator with you or measure the diameter and note whether the threads are male or female. Kitchen faucets commonly use a 15/16-inch or 55/64-inch aerator, while bathroom faucets often use a smaller size. Choosing the right flow rate matters too: a 1.5 gallon-per-minute aerator saves water in a bathroom, while a 2.2 gallon-per-minute aerator suits a kitchen where you fill pots. See our guide to faucet finishes compared if you are also considering a full faucet upgrade.
Preventing Future Buildup
A few habits keep your aerator cleaner for longer. If you have hard water, a water softener is the most effective long-term fix, and it protects your water heater and appliances too. Without a softener, cleaning the aerator every six months prevents heavy buildup from forming. It is a quick job once you have done it once, and a calendar reminder makes it easy to stay on top of.
After any municipal water work or a period when the water runs discolored, remove the aerator and flush the faucet for a minute before reinstalling it. This keeps sediment from lodging in the screen in the first place. A whole-house sediment filter is another good option for well water homes. With a clean aerator and a little routine maintenance, your faucets will keep delivering a strong, even stream for years.
Cleaning a faucet aerator is a small job with an outsized payoff. Fifteen minutes of work restores full water pressure, stops annoying sputtering, and can save you a plumber visit. Do it twice a year, and you will rarely deal with a weak faucet again. If cleaning does not restore the flow, or if you find corrosion inside the faucet itself, that is a good time to have a plumber inspect the fixture before a small problem becomes a leak.