House built in 93. Last year bang noise started whenever you turn on a fuacet (hot or cold, in shower or whenever). I am on a well, pressure tank is shuton/shutoff at 30-55. I increased it to 40-60 and same problem. I had a gas hot water heater put in last year and this seemed to happen shortly thereafter. It has a hot line recirculating feed to the second floor so I have hot water instantly in the morning. I have shutoff the recirculating valve and problem still there. I bought an air chamber device that is supposed to stop noise banging, but the instructions say this is mostly for shutoff noises. I emailed OATEY (the manufacturer of the device) asking if I should use it and should I put it on the cold line or hot line. No reply yet. Any suggestions on how to find the cause? Do I need the OATEY device? I also have intermittent sulfer problems and I have swapped out a lot of copper pipes to plastic in the basement. I have a system in place to handle the sulfer, but at times when sulfer content increase it seeps thru the system. At the copper to plastic merge points I have compression fittings. They are merged after the water softener.