If you find that you have a faucet seat that has become corroded or damaged over time, then you will need to remove it quickly before it starts affecting the rest of the faucet. A damaged faucet seat can actually cause problems with the flow of water, preventing it from coming out of the spout, and instead leaking along the line of the seat. Once the seat is corroded, then it can start forming a bond with the rest of the faucet which can make it difficult to remove. If you have any doubts, then you should call a plumber, but it is mainly a time-consuming job, rather than a complex one so with some home improvement tools you should be able to manage it.
Step 1 - Turn off the Water
Before you start doing anything involving the plumbing, you should always turn off the water as best you can. In order to get the most benefit from turning off the water, it is a good idea to shut it off at the mains. Only turning it off at the faucet pipe will work in the short term, but you may experience a water surge which can damage your chances and make refitting the faucet difficult. Use your wrench to turn the water off at the mains, and then run out any water which was already in the taps.
Step 2 - Remove the Corrosion
The next step is to remove the corrosion which is all around the faucet seat. Wipe down the area with a sponge and a clean cloth. You may need to examine the seat, and check that it is still possible to remove it. If the damage is too severe, then you may need to call in a plumber, but most removable faucet seats will still have the square bolt visible. Scrape off as much of the corrosion as you can.
Step 3 - Release the Faucet Seat
Take the edge of your screwdriver, and push it into the hole around the bottom of the seat. Tap the other end of the screwdriver with the hammer, so that it pushes the seat upwards. If there is a lot of corrosion, this may take a long time, but it is worth it. Take a pair of pliers, and hold the screwdriver in them. Take the screwdriver, and turn it slowly counterclockwise. This should loosen the faucet seat.
Step 4 - Remove the Faucet Seat
Once the faucet seat us up high enough, you can then start to unscrew the bolt which is holding the seat into place. Slide your wrench into the hole, and turn the hexagonal shape of the bolt, until the faucet seat starts to move around as you turn. You can then take the seat, and pull it upwards. You may need to use the hammer to knock away any additional corrosion. Give the faucet a wipe down once the seat has been removed.