不需要修，就說明sewer 管子沒有破裂。髒水往上反，到底是什麽原因？

說說我的供你參考，“Backwater valve flapper came off its hinge, accumulated toilet paper and plugged the line”

所有跟帖： 

• baby wipes and some other things in the main and house trap. -DD2020- ♀ (0 bytes) () 04/08/2022 postreply 16:34:49