After my upstairs toilet is flushed and the bowl fully refills, it sounds like a water hammer.
Here's a video of the noise. At 4 seconds, when the bowl has refilled, you hear the noise:
Please note I've been in this house for years, no work was recently done to this toilet or any plumbing in my home recently, and have never had this issue before with this or any toilet.
What can be done to correct this? Someone mentioned to me to buy a water hammer arrestor.
Thank you for the help!