Sagging Sewage Technique Strains-- Filth changes can create your drain line to sag. When this occurs, the part that has sunk accumulates paper and also waste resulting in a blockage., ????? ??????? ????? ?? ????? ?????????????? ???? ??? ???????? ???, ????????????? ??? ??? ??? ?? ?????????? ???? ?????????? ??? ??????? ???.?? ????????????? ????? ????