Sagging Sewage Procedure Traces-- Dust changes can build your drain line to sag. When this happens, the section that has sunk accumulates paper as well as waste resulting in a blockage.??????? ??? ?????? ???????????? ??????????, ?? ????? ??? ?? ??????????? ??? ?????????? ??? ?????? ???????? ??? ????????? ??? ???? ?????? ???.????????? ?? ?????? ????