Step\/Method 1
Buy \"Spanner Remover\".
Step\/Method 2
Clamp the bubbler with a wrench and turn it counterclockwise to unscrew the bubbler.
Step\/Method 3
Successfully removed.
Step\/Method 4
Rinse the residue of the filter with water, poke the other end with a bamboo stick, and remove the built-in bubbler of the faucet.