>That stuff is nasty as its in liquid form and easy to spill and even inhale. Also not a good idea for pipes despite how they're sold because such acids are hell on cast iron--i.e. what main sewage drains are made out of in older buildings and in jurisdictions that aren't favorable to PVC.

Eh, at the end of the day it's just acid. You can always throw something basic at it to neutralize it. It's not like it's a heavy metal.