I just had a sediment filter installed by a plumber. I didn't run the water while he was here but after he left, I found that the pipes emit a high frequency whine (singing) when either hot or cold water is turned on. It stops when the water is turned off. I have opened every spigot and let the air out from the filter installation to no avail. I turned the water off and drained the pipes and refilled the pipes but the problem remains. I'll call the plumber Monday (he was here Friday) but does anyone know an easy fix?
