Before removing the aerator, you'll need pliers and a wrench. This tool will help you remove the aerator. While it's relatively easy to replace, it's important to use pliers with rubber jaws to avoid damaging the fixture. If the aerator is too tight, a plumber will have to do it for you. When he removes the aerator, it's best to wrap the end of the aerator with tape to prevent the screw from slipping out.