How to get rid of water hammer noise or water arrester
“Water hammering” usually presents with a loud bang after you close a faucet. Many people confuse water hammering with unsupported pipes in new or older homes.
The key to differentiating between hammering and unsupported lines is to count the bangs and when they occur. Water hammering is a single loud “bang”, while an unsupported water line will produce a rapid succession of short, sharp sounds. Now, water hammering can also be the cause of the water pipe becoming unsupported from the consistent shudder of the pipe due to the hammering.