Sagging Sewage System Traces-- Dirt variations can make your drain line to sag. When this happens, the part that has sunk accumulates paper along with squander leading to a blockage.?????????? ??????????? ??? ????????????? ???? ???? ???????? (– ????? ??????????????? ??? ?? ?????????? ??? ?? ??????? ??? ??????? ??? ???? ??????.??? ????? ? ??????,