If your bathroom faucet is running slowly, you may have a build-up of calcium and minerals inside the screen on the end of the faucet. Learn how to repair a faucet that isn’t running correctly in thisfree online home improvement video, with DIY home repair tips. Expert: Greg Lim Bio: Greg Lim is a professional handyman and residential property manager. In the seven years hes been a contractor, he has fully renovated two houses.