It IS clogging sewer lines. It's crazy.
Well believe it or not, I do have a little experience in plumbing.
My mother and step father owned a plumbing, heating, air business all their life.
When I bought this house, since it ia on town system, I ask about the plumbing.
Since there was not a backflow in place, I paid a bit over $400 to have one
installed. It's something may not ever be needed but it gives peace of mind.
Every house/business should have it if they live in an area that has a city
Since this is an old coal mining town, a little elevated, hilly streets....up....
down.....up.....down.....slightly, and not knowing how old the pipes are
under the ground, and the amount of rain it gets here, I felt it was wise
to have the backflow installed.