Sagging Sewage Technique Strains-- Filth variations can develop your drain line to sag. When this occurs, the portion that has sunk accumulates paper as well as waste bringing about a blockage.?????????? ?????? ????? ??????????? ????????? ????????? ?? ???? ?????? ??????? ??? ????????? ????????? ?????????? ?? ???? ??? ???????? ??? ???????????.). ??