For Those With Septic Tanks

Went to Costa Rica last year and a couple of the Air BNB's we rented had the rule of no flushing of TP and put it in the trashcan. I was thinking that is going to stink by the end of the week. I was surprised it actually didnt and by the end of the week in that house I didnt think twice about it and how common it was all across the country.