Sagging Sewage System Traces-- Grime alterations can develop your drain line to sag. When this happens, the part which includes sunk accumulates paper in addition to waste resulting in a blockage.??????, ?? ??? ??? ?????? ? ???? ?? ?????? ?? ????? ??? ?? ??????? ??? ??????????, ?? ???????? ?? ????? ??? ? ???????????? ??? ?????????? ?? ?????????? ??