Sagging Sewage Process Strains-- Filth variations can generate your drain line to sag. When this happens, the section that has sunk accumulates paper as well as squander resulting in a blockage.????????????? ?? ?? ?????????? ?????? ??? ?????????? ???????? ??? ??????? ???? ???????? ???????? ?? ????? ??? ???? ??? ??? ?? ??? ????????????.? ??????? ???