We have grey water coming out of our sinks, toilets and showers. I have noticed a funny smell a couple weeks prior to this from my shower, but I ignored it thinking it was nothing too major. This first started when I came home. I turned on the sink to wash my hands and then all the sudden there was a gap in the water, kind of like extra air in the water and made a loud spurting noise, then all of the sudden grey smelly water came running out....
Originally asked by Jakob Landgraf on Stack Exchange (diy) (CC BY-SA 3.0).