Cleaning Faucet Aerators: Dissolving Hard-Water Mineral Buildup

Faucet aerators are small screens that seem insignificant until they aren't—then suddenly your kitchen sink is spraying water sideways or dribbling like a broken watering can. In hard-water areas, mineral deposits (mostly calcium and magnesium) build up inside the aerator mesh, blocking water flow and distorting the spray pattern. The good news is that cleaning one takes less time than making coffee and costs nothing if you have vinegar at home. This is one of those maintenance tasks that feels like a small thing until you do it and realize how much you've been living with a degraded faucet. Once clean, the difference is instant and noticeable.

1. Unscrew and Safely Remove. Turn the water off at the faucet. Grasp the aerator (the cylindrical screen piece at the faucet spout tip) with your fingers and unscrew it counterclockwise. Most aerators come off by hand with gentle, steady pressure. If it's stuck, try wrapping a thin cloth around it for better grip, or run warm water over the joint first to loosen mineral deposits. Once loose, unscrew it completely and set the parts aside.
2. Document and Disassemble. Lay the aerator on a paper towel and gently disassemble it. Most aerators have three main parts: the outer barrel (the metal housing), an internal screen or mesh cartridge, and sometimes a flow-restrictor washer. Handle the screen carefully—it's fragile. Keep all parts together in one spot so nothing gets lost. Don't force parts apart; they should come apart with gentle twisting or slight pressure.
3. Pour the Dissolving Agent. Pour undiluted white vinegar (5% acidity) into a small cup or glass—enough to fully submerge all aerator parts. Distilled white vinegar works best because it has no additional minerals that might interfere with the cleaning process. If you don't have vinegar, you can substitute with white distilled lemon juice or a commercial descaling product made for faucets, though vinegar is cheaper and works just as well for most buildup.
4. Submerge Everything Fully. Place the aerator barrel, screen, flow-restrictor washer, and any other internal pieces directly into the vinegar. Push them down so they're fully submerged. If the barrel is too large for your cup, you can lay it on its side in a shallow bowl and pour vinegar around it, rotating it halfway through soaking. The screen and smaller parts should be completely covered.
5. Let Chemistry Do the Work. Leave the parts in vinegar. There's no need to stir or agitate during soaking. The acetic acid in vinegar dissolves calcium and magnesium deposits over time. For light buildup, 4 hours is often sufficient. For heavy, crusty deposits, 8 hours works better. You can soak overnight if convenient—there's no harm in leaving it longer. If you're in a rush, you can speed this up by gently warming the vinegar in the microwave for 30 seconds before soaking (make sure it's not hot to the touch).
6. Brush Away Mineral Crud. Remove the parts from the vinegar and rinse them under running water. Use an old toothbrush or a small soft-bristled brush to gently scrub the screen and the inside of the barrel where mineral deposits clung. You should see white, chalky residue come loose. Pay special attention to the mesh of the screen—deposits love to hide in those tiny gaps. For stubborn spots, dip the brush back in vinegar and scrub again. If deposits are still heavy, soak for another 30 minutes and repeat.
7. Clear the Hidden Spout. While the aerator is off, look up into the faucet spout opening. Sometimes mineral buildup and loose debris collect there too. If you see any white or crusty material, run warm water through the spout opening to flush it out, or carefully poke at stubborn deposits with a toothpick or thin brush. This often gets overlooked and can restrict flow just as much as a clogged aerator.
8. Rinse Every Surface Completely. Hold each aerator part under running water and rinse until no vinegar smell remains and the water runs clear. Run water through the screen mesh from both sides. Make sure no debris or vinegar residue is trapped inside the barrel. You want everything to look clean and bright. If any white deposits are still visible, return the parts to vinegar for another 2-hour soak.
9. Put It Back Together Correctly. Dry all parts with a clean cloth. Reassemble the aerator in the reverse order you took it apart. Typically this means: flow-restrictor washer first, then the screen, then the outer barrel. Screw the barrel closed gently—you should feel a slight resistance but don't overtighten. Test the assembly by running water through it over the sink to make sure water flows freely and no parts are leaking or misaligned before reinstalling.
10. Screw Back and Verify Fit. Hold the faucet spout in one hand and screw the aerator back on clockwise using your fingers. Tighten gently until snug—you should feel a slight friction, but you shouldn't need tools or force. Stop when it feels seated; over-tightening can crack the aerator threads over time. Turn the water back on and check the spray pattern. The flow should be noticeably stronger and more uniform than before.
11. Confirm the Spray Pattern. Turn on the faucet and let water run for 10-15 seconds to flush any remaining sediment. Look at the spray pattern—it should be even and not spraying off to one side. Feel the flow volume; it should feel significantly stronger than before cleaning if mineral buildup was the problem. If the flow is still weak, the aerator may need another soak, or there may be debris in the spout that needs additional flushing.