To remove a hidden or cache aerator that sits recessed inside modern faucet spouts, you need a specialized aerator removal wrench (faucet key) that matches the specific tooth pattern or flats of your fixture. Insert the correct plastic key into the end of the spout engaging the aerator slots, and turn counterclockwise to unscrew it. If you lack a key, you can grip the inner ring gently with needle-nose pliers wrapped in tape. Verification: Unscrew the hidden aerator completely and inspect the internal threads for trapped mineral scale.
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