Sagging Sewage Process Lines-- Dust adjustments can build your drain line to sag. When this occurs, the portion that has sunk accumulates paper together with waste leading to a blockage.??????, ?? ??? ??? ?????? ? ???? ?? ?????? ?? ????? ??? ?? ??????? ??? ??????????, ?? ???????? ?? ????? ??? ? ???????????? ??? ?????????? ?? ?????????? ?? ?????????