Faucet aerators typically do not have a strict expiration date and often last for many years if cleaned regularly, but they generally need descaling every 6 to 12 months depending on your local water hardness. If the internal mesh screen becomes permanently clogged with heavy calcium crust or if the rubber washer flattens out and leaks around the threads, replacing the entire aerator costs only a few dollars. Verification: Inspect the aerator flow pattern annually during routine home maintenance checks.
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