Help!! I have a gas hot water heater that is approx 10 years old. All the faucets in the house become clogged with a white, chunky "porcelain" looking material that crumbles between my fingers. It is only on the hot water side of the faucets. Once a week I have to take apart each faucet to clean otherwise hot water flow is extremely restricted. What do I need to do to rectify?