The very first thing you should know about water hammer is what it is, and then from there, we can explain the problem with it.
Water hammer may sound like a really ominous term, but really all it is is describing a sound that resembles knocking that comes from inside your pipes. You might have even heard it before and had no idea where it was coming from.
Water hammer is not a plumbing emergency, however, it is something to be concerned about in the sense that you want to have it addressed by a professional plumber as soon as you can. Read on to learn what causes this and the problem with it!