High on the checklist of experiences nobody wants to have is a sewer back-up or overflow. Fortunately, this experience can usually be stayed clear of by being aware of what causes back-ups and preventing those reasons. The two key causes of sewer backups as well as overflows are oil and roots.
http://marcoffpz937.lucialpiazzale.com/the-history-of-apofraxeis-agia-paraskevi