I've lived in an old house many years and since I've been here the washer in the basement drains into the floor drain, which drains into the sanitary sewer. It's not an ideal setup but it works fine and I don't see a lot of reason to have it redone. I have also added a darkroom sink next to it and I am also draining that sink into the floor drain. Is there any disadvantage to this other than that the city might force me to fix it at some point to bring it "up to code"? Indirect connections are apparently used a lot I found in restaurants but not as much in residential and I can't find much on the pros and cons of them.
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