Sagging Sewage System Lines-- Dirt changes can produce your drain line to sag. When this happens, the area that has sunk accumulates paper as well as waste resulting in a blockage.??????? ??? ?????? ???????????? ??????????, ?? ????? ??? ?? ??????????? ??? ?????????? ??? ?????? ???????? ??? ????????? ??? ???? ?????? ???.??????????? ????? ???? ??????