Sagging Sewage System Strains-- Filth changes can create your drain line to sag. When this happens, the portion which has sunk accumulates paper and also waste bringing about a blockage.?????????? ????????, ????????????? ??? ???????? ???? ?????, ???????? ? ???????:?? ?????? ???????? ??????? ??? ?????????? ??????????? ??????????? ??????? ??? ????, ?