Sagging Sewage System Traces-- Dust variations can develop your drain line to sag. When this occurs, the portion which includes sunk accumulates paper and squander resulting in a blockage.???? ????????? ??? ????????, ???? ??? ?????????, ???? ??? ???????????????? ???????? ??????????, ???????? ???? ??? ??? ?? ?????? ????? ???? ???? ????? ? ??? ?????