Most kitchen and bathroom faucets in a St. Louis home have a small screen threaded into the tip of the spout. That part is the aerator. It mixes air into the stream, keeps the flow soft, and holds back debris. In a hard water home it also catches mineral particles, and over time those particles can narrow the openings until the faucet sputters or sprays unevenly. The fix is usually simple, and you can do it with basic tools and a little patience.
What an aerator does
Inside the housing you will usually find a plastic or metal screen, sometimes with a small rubber washer and a set of tiny parts stacked in order. The stack matters. If you pull the parts out, keep them in the order they came out so you can reassemble them the same way. Not every faucet uses the same design, so treat your first disassembly as a record of how the piece goes together.
Signs of a mineral clog
- The stream splits, fans out, or sprays sideways instead of coming out straight.
- Water sputters or spits when the tap is first opened.
- Flow feels weaker at one faucet while others in the same house run normally.
- You see a white or chalky crust around the outlet or on the screen.
Hot and cold sides can clog at different rates, so check both handles. If only the hot side is weak, the water heater area may be worth a look as well, but start with the aerator because it is the quickest to inspect.
Taking the aerator apart
- Shut off the water supply to the sink, or close the shutoff valves under it. Then open the faucet to relieve pressure.
- Wrap a cloth or rubber sleeve around the aerator so pliers do not scratch the finish.
- Unscrew the aerator counterclockwise by hand first. If it is stuck, use the cloth and a gentle pliers grip.
- Lay the parts out on a towel in the order they came out, with the screen side facing up.
Cleaning the screen
Rinse each part under running water, using your thumb to rub away loose grit. For the crust, soak the parts in a bowl of white vinegar until the deposits soften, then scrub gently with an old soft toothbrush. Avoid steel wool and abrasive scouring pads, since they can scratch the finish on the parts and leave fine metal bits behind. Rinse thoroughly before reassembly, and check that no small pieces are bent or cracked.
If a screen is torn, warped, or badly pitted, replace the whole aerator rather than forcing it back into service. Replacement aerators are sold for most common faucets, and the faucet model is usually stamped on the body or listed in the manual.
Checking the flow after reassembly
Reinstall the parts in their original order, hand tighten the aerator back onto the spout, and turn the water on slowly. Look for a steady, straight stream. Run the tap briefly, then check for leaks at the base of the spout and around the threads. A small drip after reassembly often means a washer is out of position, so take the aerator apart again and check how it seats.
When the faucet itself is the problem
Sometimes a clean aerator does not fix weak or uneven flow. Mineral deposits can build up inside the faucet body, or a worn cartridge can restrict the path. Look at whether the trouble happens on one side only, whether it appeared suddenly after a change in your plumbing, and whether other fixtures on the same line behave the same way. Those answers help you decide whether to keep cleaning or to have a plumber take a closer look. This guide does not replace that inspection.
Keeping the screens clear
- Check each aerator once or twice a year, and more often if your St. Louis water tends to leave a lot of residue.
- Keep a small container of white vinegar and an old toothbrush near the sink for quick soaks.
- Take the aerator out after a long absence or a plumbing repair, since debris can move into the screen then.
- Note which faucets clog fastest so you know where to look first next time.
A little routine attention keeps the flow even and the spray steady. It is one of the simplest hard water chores a homeowner can do without special tools.