Sagging Sewage System Traces-- Grime changes can make your drain line to sag. When this happens, the area which has sunk accumulates paper along with squander leading to a blockage.?? ? ??????????? ????? ???? ??????? ???? ??????????? ?????, ????? ?? ????? ??????? ??? ????????? ???, ?? ?????? ???? ?? ??? ?????????????.???? ??????? ??? ??? ????? ????