There was a show about this on TV last week. I believe that it was
Emerile's house.


In article ,
c (TOM KAN PA) wrote:
All the drains in my daughter's house run very slow, including the
toilets.
They never overflow or not drain, they're just slow.

Whether the toilet is flushed empty or with waste makes no difference.
This sounds to me like it could be the vent pipe.
Is this a possibility?

How do you determine if it is indeed at fault?

And how do you clean it out?