Sagging Sewage Method Lines-- Dust changes can make your drain line to sag. When this occurs, the portion which has sunk accumulates paper and waste resulting in a blockage.?? ? ??????????? ????? ???? ??????? ???? ??????????? ?????, ????? ?? ????? ??????? ??? ????????? ???, ?? ?????? ???? ?? ??? ?????????????.?????? ??? ??? ?????????, ?????? ??? ??