Sagging Sewage System Lines-- Grime changes can develop your drain line to sag. When this happens, the part which includes sunk accumulates paper and waste bringing about a blockage.??????, ?? ??? ??? ?????? ? ???? ?? ?????? ?? ????? ??? ?? ??????? ??? ??????????, ?? ???????? ?? ????? ??? ? ???????????? ??? ?????????? ?? ?????????? ?? ????????? ???