Here in Chicago we have a combined sewer and storm drain system - as a result it's not uncommon to have sump pits and ejector pits combined - which is the case in my basement. The ejector then handles the sump pumping, as well as removing the basement sewage.
My ejector services the basement bathrooms and shower as well as any rain seepage from the drain tiles, but since it's a combined system I am terrified of an overflow.
The good news is that if there is an overflow, its likely to be just my home's waste & the clear storm water, but that's still enough to ruin a basement.
My question is, what backup systems would you recommend for this type of setup? The ejector is currently mains powered (plugged in), so if I lose power, I essentially have no sump pump.
I'm considering a water powered backup sump pump, but am concerned about any potential sludge or remaining waste clogging a system that is not built for any solids/semi solids.
Any brilliant ideas?