Teh washer is probably worn and has a sharp thin edge which is acting as a reed when the velocity is at the right rate.: When using the upstairs bathroom, the faucet will emit a high pitched squeal during use of the shower. The squeal seems to be linked to the pressure. The squeal starts as pressure goes down, and then quits when the pressure returns to normal. It is a well system, with a pressure tank, and water softner. Any suggestions would be greatly apprecaited.
