Broken or ruptured sewer pipes are one big reason for a clogged or would-be clogged sewer. If the sewage is unable to drain-out from the system properly, it will lead to smelly and filthy backups. A sewer pipe rupture can be caused due to increased ground movement and traffic and usage of inferior quality of material while construction.
Tree & Shrub Roots:
Old sewer lines were constructed either out of clay or some other porous material. Moreover, the connections between their sections were not as tight as they are today in case of PVC pipes. Therefore, when the roots of trees and shrubs grow, they stretch in search of water and ultimately land up in the sewer pipe of your home or office.
Any kind of debris like toilet paper or objects that are accidentally flushed down in the toilet can also make the toilet sewer clog-up. In fact, toilet paper, in particular, can end up catching onto tree roots or some other obstructions that are poking from the sides of the sewage pipe. Eventually more toilet paper gathers at that spot resulting in a big clog.
Grease and Oil:
Grease, fats and oil also contribute significantly in clogging sewer lines. Pouring grease or any sort of oil down the drain is never a good idea. In case you want to throw away hot grease, pour it in a coffee can and once it solidifies, throw it in the dustbin. People also think that running hot water while pouring grease can help but it doesn’t.