Sagging Sewage System Traces-- Dirt changes can build your drain line to sag. When this occurs, the segment which has sunk accumulates paper as well as waste resulting in a blockage.????????????? ?? ?? ?????????? ?????? ??? ?????????? ???????? ??? ??????? ???? ???????? ???????? ?? ????? ??? ???? ??? ??? ?? ??? ????????????.– ????? ???????????????