have brownish colored hot water in the tub and shower. drained and flushed the hot water heater which is only 4 years old. ran water in all faucets and flushed them out, the kitchen and shower and tub spurted out a lot of brown water then ran clear. water ran clear in tub and shower that night. the following evening the water ran brownish colored again. Not sure what to do next. We have a well but the cold water does not have any color to it.