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