Sagging Sewage System Traces-- Dust variations can generate your drain line to sag. When this occurs, the part that has sunk accumulates paper as well as squander leading to a blockage.????????????? ????? ?????????? ???? ?????????? ????????????? ???? ???????? ??? ??? ??? ??????, ???? ??? ??????? ?????? ??? ????????????? ?????????? ??? ??? ?? ??????