![OC) the kitchen sink in our new house is backing up with wastewater from the bathroom after showering, flushing the toilet etc. : r/WTF OC) the kitchen sink in our new house is backing up with wastewater from the bathroom after showering, flushing the toilet etc. : r/WTF](https://i.redd.it/b3iiy7f4gny21.jpg)
OC) the kitchen sink in our new house is backing up with wastewater from the bathroom after showering, flushing the toilet etc. : r/WTF
![Just moved into an old apartment; this showed up in the kitchen sink overnight, and I have no clue what it is! : r/Plumbing Just moved into an old apartment; this showed up in the kitchen sink overnight, and I have no clue what it is! : r/Plumbing](https://i.redd.it/aua37kcm54a01.jpg)
Just moved into an old apartment; this showed up in the kitchen sink overnight, and I have no clue what it is! : r/Plumbing
![drainage - What is causing my kitchen drain to back up into my dishwasher? - Home Improvement Stack Exchange drainage - What is causing my kitchen drain to back up into my dishwasher? - Home Improvement Stack Exchange](https://i.stack.imgur.com/t9V12.png)