Extremely loud vibration in bathroom after taking a shower

[CleanSump]

We had a pipe that would vibrate when water was shut off at a faucet, or toilet flushed. I put dampers (hammer arrestors) on the water lines at the washing machine and that cured it.. Google Water Hammer.

 

[whizbyu]

Regarding drains that have compromised inside diameters due to build up: How safe is Thrift if used correctly?