Question I have a slight problem. I added a laundry in the basement and connect to upstairs kitchen/dishwasher drain. While I did that in a hurry I want to permanently fix a issue I have is which laundry standpipe keep overflowing and at the same time add a laundry sink that wife want. I’m attaching a pic off my current setup. What would be the best option for me to fix this issue. Thanks in advance for helping me out.