Sagging Sewage Process Lines-- Dirt variations can create your drain line to sag. When this happens, the segment which has sunk accumulates paper as well as waste resulting in a blockage.????????? ?? ????? ??? ???????? ??? ??? ?????????? ?? ?????? ??? ????????? ??? ??????? ??? ?????? ???????? ????????.???? ??????? ??? ??? ????? ????????????? ??????