Sagging Sewage Program Strains-- Grime variations can develop your drain line to sag. When this happens, the area which has sunk accumulates paper in addition to squander resulting in a blockage.?? ?????? ??? ?????????????, ???????????? ????? ??????????? ??? ??? ?? ???? ????????? ???, ???? ??? ??????? ???? ????? ????????? ?????? .???? ?? ???????? ?