Sagging Sewage System Traces-- Filth alterations can create your drain line to sag. When this happens, the section that has sunk accumulates paper as well as squander leading to a blockage.??? ????? ???????????? ??????????? ?????? ?? ??????????? ??? ????? ??????? ?? ??? ???? ??? ????????? ??? ?????? ?? ??????????.??????????????? ?? ??????? ??? ????