Sagging Sewage Method Strains-- Dust changes can produce your drain line to sag. When this happens, the segment that has sunk accumulates paper as well as waste resulting in a blockage.?????????? ??????????? ??? ????????????? ???? ???? ???????? (? ??????? ????????? ??? ?????????? ??? ??????? ??????????? ?????????? ????? ???????? ??????? (??? ?????