Sagging Sewage Process Lines-- Grime modifications can produce your drain line to sag. When this occurs, the segment which has sunk accumulates paper as well as squander resulting in a blockage.?????????? ??????????? ??? ????????????? ???? ???? ???????? (– ????? ????????? ???? ??????? ??? ??? ??? ??????? ????.?? ????????? ??? ??????????? ??? ????