Hi Everyone - Would love some help with solving water hammer. House built in 1987 with copper pipes. Moved here in 2000. At some point, long ago, water hammer developed. We installed a hot water recirculator years ago that alleviated the issue as well as provided instant warm water. Well, that device has broken and while we might replace it, we felt we should get to the bottom of the hammer before we try to sell the house (soon, we hope) and a home inspection leads to an expensive repair needed immediately. The pipes do a fading echoing bang (3 or 4 times, about a second in between each bang) when the water at all faucets is shut off (toilets, sinks, sprinklers, dishwasher, clothes washer - everything). When the water comes on, we hear one "bang," more a of a knock really (that we can hear over the water running). Several times, we've done the routine of turning the water off at the main, draining the pipes, flushing the toilets, turning the water back on and shutting faucets from bottom up when water runs steadily. This solves the problem but only for a very short time, last time less than an hour. We've installed water hammer arrestors at the dishwasher and the washing machine but the banging has returned. Every toilet has had its insides replaced with Korky Quiet Fills. Still have the banging. Professional plumber says he can install an inline arrestor at the main for under $220 and says it has about a 75% chance of fixing our problem. But I am skeptical. Because the hot water recirculator stopped the hammer as long as it constantly recirculated water through the pipes, I suspect we have a water pressure issue. Can anyone offer guidance? Thanks!

My daughter bought a house that is on a well. The house originally had galvanized piping throughout the house, and water pressure was very weak. All the metal piping was replaced with PEX. I was hoping that getting rid of the galvanized would help with the pressure but it didn't. Is replacing the pressure switch at the tank the best/only way to increase the pressure, or is there any adjustment in a standard pressure switch? Thanks.