Sagging Sewage Technique Strains-- Grime variations can build your drain line to sag. When this occurs, the section which has sunk accumulates paper as well as waste resulting in a blockage.??????????? ??? ????????? ??? ??????????? ??? ??????????? ??? ??? ????, ???????, ??????? ? ??????, ???????????? ?????????? ?????????? ??? ??????? ?? ????????? ?