My brother refinished my basement including a bathroom. He used one of my sump pits as an ejector pit. I am told that the furnace, water softner & washer also drain into this pit. However since the bathroom has been finished about 4x a year I get water from the pit or drain in the furnace room. I have been told this is because the ejector pit is incorrectly sized & should not be tied into these other drains, and to correct the problem I need to have an actual correctly sized ejector pit put in. Is this true? This will be a difficult task, so I am wondering if there is an easier way to fix the water overflow problem besides digging up the concrete floor?

I'm curious. Tell me more about this sump pit and its system. Is the pit open? What does it discharge into? How long have the bathroom been connectedc? Any vents run?
Let's have more details Regards, Tom

Please, snap few pictures of your sewer ejector pit and surrounding area and post it for us to see... Thanks... Milo

I can snap a few pic in the morning. The sump pit I am told is a standard 24" deep pit. It has the furnace, water softner drain, hot water heater drain, washer, and then the toilet, bath tub (rarely used) & bathroom sink. It is vented to the roof and was sealed when it leaked somehow. The bathroom has been finished about 18 years

If you have a bathroom group connected then you don't have a sump pit, you already have a ejector pit.
Does you present setup accept the solids from then toilet? What size piping do you have? Let me know, Tom