I'm attempting to build a basement apartment and would like to add a toliet however it's only near this side drain that currently is for my upstairs sink and laundry. It's about 2.5-3 in Dia but appears to have some sorta of reducing coupling at the bottom... Photos below.

Option 1. Saniflow macerating toilet empty into drain.

Option 2. Rear discharge toliet with 3'' to exiting drain with access to clear pipes.

This drain should be close to the 6'' main that goes to the street not sure on slope or anything underneath. I was going to rent a camera to see if I can find out either of those.

[goo.gl]



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So, is the plan to run the new downstairs washing machine on the same drain as the upstairs washing machine and laundry sink, plus add a toilet fixture?



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Incorrect. it's a bathroom sink and toliet plus wash machine and two kichen sinks... Highly unlikely all will be going at once it would be a second bath in the basement I just though a half bath would be a nice bonus and cheap to do sadly I think I'm wrong...

Upstairs laundry are on main drain



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Downstair's fixtures need to be vented.

even if it is highly unlikely they will all be running at once, code says they need to be piped as if they were.

Agreed, it would probably work satisfactorily for him and if getting it inspected isn't something he is planning to do (I know that may be a shocker but in many areas no inspection isn't unusual) then he could accomplish his plan. Would need to somehow add venting to help draining, or maybe add AAV's upstream of fixture traps where possible. Since the toilet trap is builtin to its bowl on a normal toilet I don't know if possible to add AAV to the ejector type toilets.