#255867
Anonymous
Participant

Cast Iron itself will not bend but there can be settling at the joints which will leave a dip. Often a structure has cast iron inside and changes to clay piping outside. Clay is noted for allowing roots to enter and to have dips. Many houses have their sewer cleaned yearly. When the drain needs to be cleaned more frequent than yearly then it is time to replace the line.
When they clean the line this time ask them where and what the obstruction is.