^ although we have a disposal we don't put potato peels, vegetables, etc in there. we catch whatever big things are caught on the sink drain and dispose the smaller pieces left behind.
my sink is a single with 1 tube going from the sink to disposal and out behind the wall. it clogged before but went away with chemicals, never was this bad before so we are worried about having to tear the wall apart behind if we can't figure out whats wrong.
afaik roto rooter is the only place i know that uses fiber optic to see what is causing the back up. im not sure what other route to go.