WSS
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Whenever I turn on any water source in the house (shower, washer, flush toilet), there is a loud humming noise (like a foghorn) coming from the pipes. It is loudest right at the main shut off valve inside the house (which is in a closet). As soon as the water source is shut off, the noise disappears. Opening/Closing the valve (globe, I think, maybe gate) to different positions alters the sound, sometimes eliminating it, but it soon reappears. Thoughts?