The small mesh screen at the tip of a faucet is called an aerator. It mixes air into the stream so the flow feels full while using less water. In an Arnold home, the aerator also catches whatever travels through your plumbing, including mineral scale from hard water, bits of rust, and grit that can be knocked loose after work on a water main or a water heater. Checking it is one of the quickest jobs a homeowner can do, and it often explains a weak or uneven stream without any special equipment.
Signs the aerator needs attention
- The stream sputters, spits, or splits into odd angles.
- Flow is weaker at one tap than at others in the same room.
- A white crust or small grains show around the edge of the screen.
- Water looks cloudy at first and then clears as it keeps running. Trapped air often causes this, but a dirty screen can do the same thing.
What you will need
Gather a towel, a small bowl, a soft brush such as an old toothbrush, and a cup of white vinegar. Most aerators unscrew by hand, but if one is stuck, use the adjustable wrench or the tool that came with the faucet, and wrap the jaws in a cloth so the finish is not scratched.
Cleaning steps
- Shut off the water supply valve under the sink, then run the faucet briefly to drain the line.
- Wrap a towel around the aerator and unscrew it slowly by hand.
- Take the parts apart in the order they came out. Note where each washer or spacer sits, and lay them on the towel.
- Soak the metal and plastic pieces in the vinegar until loose deposits soften.
- Rinse each part, then brush the screen gently to remove grit. Do not force the mesh, since bent openings change the spray pattern.
- Reassemble the parts in the original order, with every washer in place, and screw the aerator back on by hand.
- Open the supply valve slowly, then check the joint for drips before you walk away.
Checks beyond the screen
If only the hot side is weak, the cause may sit upstream of the faucet. Heavy scale inside a water heater or on the hot supply line can narrow the path, and so can a partly closed valve. Compare the hot and cold flow at the same tap. If the cold side is steady and the hot side is not, the next step is to look at the water heater and its supply connections rather than the faucet itself.
If several fixtures in the house are weak at once, the problem is probably not the aerators. A pressure regulating valve, a clogged inlet screen on an appliance, or a supply issue on the street side may be the source. Ask a licensed plumber to check the main shutoff and pressure if the pattern shows up throughout the home.
What a clean aerator does not tell you
Cleaning an aerator changes how the water flows, but it does not reveal what is in the water. It cannot show lead, bacteria, nitrates, or chemical byproducts of treatment. Homes in Arnold draw on a mix of sources, and local water reports describe the tap water in the area as hard. Those reports also list topics such as chloramine, TTHMs, HAA5, and chromium-6, which need a report or a lab result to understand.
Well owners need to test separately. Private wells in and around Arnold can carry iron, manganese, sulfate, coliform bacteria, nitrates, radium, or radon. If your property is in the south or west parts of the area, near the SW Jefferson County Mining Superfund area, sample the well for lead. A state-certified lab can give you the right test, and the sample should be taken by a process the lab provides, not guessed at from a faucet screen.
Keeping the habit
Add the aerator to a simple maintenance list. Check the screen when you clean the sink, and note any change in flow in your home water log. A screen that clogs quickly points to sediment in the supply, which is useful information when you decide whether to add filtration or ask for a water test. Clean screens make it easier to tell the difference between a plumbing problem and a water quality question.