Sagging Sewage Program Strains-- Dust variations can make your drain line to sag. When this happens, the segment which includes sunk accumulates paper along with waste leading to a blockage.????????? ?? ????? ??? ???????? ??? ??? ?????????? ?? ?????? ??? ????????? ??? ??????? ??? ?????? ???????? ????????.?? ????????????? ????? ??????? ?? ???????? ?