Uwe82
2018-01-24 17:27:57
- #1
If the processes are below the backwater level, a lifting station is mandatory.
As far as I have been told, it is not necessary. If the backwater flap is closed, wastewater should simply not be discharged below. As long as there is still a toilet above the backwater level, a lifting station is not required, an electric backwater flap is sufficient.
And the way it is shown in the last graphic, it is not allowed to operate like that. The barrier must, in my opinion (layman), be between the drain in the basement and the pipes coming from above.
//EDIT: There is no backwater flap installed there, so it works like that. However, you need pipes that first go upwards and then downwards.
Alternatively with backwater flap: Separate wastewater pipes must lead to the sewer once for below the backwater level and once for above the backwater level. This ensures that above is constantly drained and below flows in.