Sagging Sewage System Traces-- Dust improvements can create your drain line to sag. When this happens, the segment which has sunk accumulates paper as well as waste resulting in a blockage.???? ????????? ??? ????????, ???? ??? ?????????, ???? ??? ???????????????? ???????? ??????????, ???????? ???? ??? ??? ?? ?????? ????? ???? ???? ????? ? ??? ?????