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this post was submitted on 07 Aug 2025
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Asklemmy
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If it works, it works, I guess. It didn't at our case (clogged too badly, the previous inhabitant did some, weird shit), hence the plumber.
I did it like you did and then the shit water came up the bathtub several cms high. Later attempts changed nothing. Was a disaster. But the plumber went wild and it worked.
That is pretty odd that your black water and grey water pipes are connected. I thought they were usually separate so that your shower didn’t smell like shit.
That is completly normal in Germany (and most of the rest of this world). Only very few buildings have separate grey water lines.
A"siphon" or "trap" is why this doesn't cause a smell problem.
Normally a separate grey water line is only used, if the grey water can be used on the property. A separate public grey water collection system is almost unheard of, except in some scientific project related developments (there has been some research into this, but it hasn't proven to be a reasonable solution, for now at least).
I might have to add that I am a civil engineer specialiced in urban water management. :)