Back Wash from a washing machine

[theDIYdad]

Hi

Over the years I have always managed to do most DIY tasks myself.
However this one has me stumpted:

I live in a town house and it has a wet room on the ground floor with a utility room next to it. The utility room has a sink and washing machine plumbed into the outlet of the sink.

The wet room has a shower and a small sink.
The problem that I am having is that when the washing washing empties, the water back washes into the shower trap. Whilst it nearly reaches the top of the trap, it slowly drains back again.
The issue is that we end up with a soap stain from the washing powder.

Does anyone know of something like a one way value that will stop the back washing, yet requires very little water pressure for the shower trap to drain into it?
Thanks

 

[bhm1712]

it sounds like the sink drain where the washer is plumbed into is sharing a common drain with the shower drain. If the volume of water from the machine is not draining away fast enough due to small pipes or restrictions then it will inevitably fill up the drain pipes. The lowest point in the drain will likely be the shower and so you are seeing the waste water there. The easiest solution would be to plumb the washer into another drain or make it easier for the water to drain away. Could you fit a stand pipe type drain for the machine and plumb straight into the main drain?

 

[Nige F]

Hi

Over the years I have always managed to do most DIY tasks myself.
However this one has me stumpted:

.

Does anyone know of something like a one way value that will stop the back washing, yet requires very little water pressure for the shower trap to drain into it?
Thanks

Hep V O waste valve