Sagging Sewage Process Traces-- Dust alterations can produce your drain line to sag. When this occurs, the section which has sunk accumulates paper as well as waste resulting in a blockage.??????? ????? ????????? ?? ????? ???????, ?????????? ??? ??????????? ??????, ??????? ??? ?? ????????? ??? ??? ???????? ??????????.) ????? ????, ????? ??? ???????