Sagging Sewage System Traces-- Dust modifications can create your drain line to sag. When this occurs, the portion which has sunk accumulates paper as well as squander leading to a blockage.????????? ?? ????? ??? ???????? ??? ??? ?????????? ?? ?????? ??? ????????? ??? ??????? ??? ?????? ???????? ????????.?? ?????? ???????? ??????? ??? ?????????? ??