How to Replace a Faucet Aerator

Step 1: Make sure the aerator is the likely problem

1. Look at the water stream from the faucet. An aerator problem usually shows up as low flow at one faucet, a spray pattern that shoots sideways, or a stream that pulses and splashes.
2. Check whether hot and cold both have the same weak or messy flow at this faucet.
3. Look at the tip of the spout. If you can see mineral crust, debris, or a damaged screen at the outlet, the aerator is a good repair to try first.
4. Put a towel in the sink or close the drain so small parts cannot fall in.

If it works: You have signs that the problem is limited to the faucet outlet and the aerator is a reasonable replacement.

If it doesn’t: If several fixtures in the house have low pressure, troubleshoot a broader water pressure or supply issue before replacing the aerator.

Step 2: Remove the old aerator carefully

1. Dry the end of the spout so you can grip it better.
2. Try turning the aerator counterclockwise by hand while facing the faucet.
3. If it is stuck, wrap the aerator with a soft cloth or use a rubber grip pad, then loosen it gently with slip-joint pliers.
4. Remove the aerator and keep any screen, insert, or washer pieces together so you can compare them to the replacement.

Step 3: Match the replacement before installing it

1. Compare the old aerator and the new one side by side.
2. Check whether the faucet uses male or female threads and make sure the new aerator matches.
3. Confirm the diameter looks the same and that the new aerator includes the correct washer or gasket.
4. If your replacement came with multiple adapters, choose the one that matches the old setup rather than forcing a near fit.

Step 4: Clean the faucet outlet and threads

1. Use a toothbrush or nylon brush to remove grit and mineral buildup from the faucet threads and the seating surface at the end of the spout.
2. Wipe the area clean with a damp cloth.
3. Make sure the old washer is not still stuck inside the spout if your faucet design uses one.
4. Check that the threads are clean enough for the new aerator to start smoothly by hand.

Step 5: Install the new aerator by hand first

1. Place the washer or gasket in the new aerator if it is not already installed.
2. Thread the new aerator onto the faucet by hand, turning it clockwise while keeping it straight.
3. Tighten it until it is snug and evenly seated.
4. If needed, give it a very small final snug with pliers over a cloth, but do not overtighten.

If it doesn’t: Remove it and start again by hand if it feels crooked or binds early.

Step 6: Test the faucet in real use

1. Turn the faucet on slowly and let water run for 30 to 60 seconds.
2. Watch the aerator connection for drips and check that the stream is even and controlled.
3. Run both hot and cold water if the faucet has separate temperature control through the same outlet.
4. Use the faucet normally for a minute or two to make sure the flow stays steady and the aerator does not loosen.

If it works: The faucet has a smoother, more even stream and the aerator connection stays dry during normal use.

If it doesn’t: If the stream is still weak, remove the aerator and recheck the washer, thread fit, and any debris at the outlet. If flow is still poor with the aerator removed, the restriction is likely elsewhere in the faucet or supply path.