hammer arrestor

I have had an issue with water pipe hammering for a number of weeks and can't get it to stop. I had my shower replaced about a year ago. Up until a couple weeks ago, there was no issue with hammering. Now, it has gotten really bad. I added pipe insulation all over the place, added and tightened...

After a master bathroom remodel (new shower tiles and valves), every time the toilet flush or any faucet within 50 feet closes, there's a knocking sound from wall and ceiling with the shower. The piping is CPVC and PEX just at the shower. I tried a small hammer arrestor at the toilet and...