The Common Ground Handbook

I've been reading the Common Ground Handbook tonight and I came upon a section I was not expecting.

"Papel Higienico: Toilet Paper
Most Costa Rican plumbing isn't designed to handle paper products of ANY kind. Be sure to throw toilet paper in the wastebasket near the toilet."

This was something I would never have even considered before I read the handbook. It would be really embarrassing to cause a plumbing problem at your host family's home on the first day. Also on a side note, the book mentions that Costa Ricans use the formal usted form most often and you will very rarely hear the Tu form used.