Sagging Sewage Process Lines-- Dust modifications can build your drain line to sag. When this occurs, the area which has sunk accumulates paper and squander resulting in a blockage.??????????? ??? ????????? ??? ??????????? ??? ??????????? ??? ??? ????, ???????, ??????? ? ??????, ???????????? ?????????? ?????????? ??? ??????? ?? ????????? ??? ??? ??