I ran across this yesterday and while it is not very common here I think i know what it is. For some reason I keep questioning myself and need some insight.
Home is 6 years old on public sewer system and has a walk out basement with one bathroom in the basement.
Am I looking at a sewage pump in basement pumping to a grinder pump outside and then it goes into the public sewer? The alarm system in the other pics is in case of system failure?
Alarm.pdf (206 KB)