Sagging Sewage Process Lines-- Dirt variations can create your drain line to sag. When this happens, the area that has sunk accumulates paper and squander resulting in a blockage.?????????? ??????????? ??? ????????????? ???? ???? ???????? (????? ????? ????? ? ???????? ????? (?.?. ?????? ???????????)?????????, ?????????? ??? ??????? ????? ??????????