Using sulfuric acid down vent pipe

[Bliggity]

Once I pour the acid down the pipe do I let it sit for about 30 mins then flush my toliet, or do I need to also rinse with a hose?

 

[johnjh2o]

My question is why would you do it in the first place?

John

 

[havasu]

Good gawd, wouldn't this be a plumber's job security for a great big job?