High up on the listing of experiences nobody wants to have is a sewage system backup or overflow. Fortunately, this experience can typically be avoided by recognizing what triggers backups and staying clear of those causes. The two primary causes of drain back-ups as well as overflows are oil and roots.
https://www.openlearning.com/u/mitchell-qb96y3/blog/AnIntroductionToApophraxeisArguroupole/