Dirty water from washing machine flows up the bath plug hole

boilerfrustration · 9 Nov 2010

When my washing machine is pumping out, the dirty water flows out to the main black waste pipe.

But due to awkward plumbing, some of the dirty water rears its ugly head out of the bath plug hole which is quite low to the ground.

Although appearing for just a few fleeting seconds before draining off, the dirty water doesn't look very nice and is no doubt unhygienic. Can anyone recommend any type of valve or device that I can install under the bath to prevent this from happening?

seco services · 9 Nov 2010

you can fit a hep v0 to the bath waste.
but it shouldn't happen in the first place so clearly is a plumbing problem
somewhere.
has it always done it ?
is a drain partially blocked ?

have you a diagram of the layout ?

boilerfrustration · 9 Nov 2010

Yes, the dirty water has always flowed back in this way. I've tolerated it for a long time but just feel it needs to be resolved.

I'm quite certain the plumbing is primitive. I suppose a simple way of describing the problem is to imagine a Y shaped piping system. The washing machine is to the top left of the Y and the bath is to the top right. The black waste pipe is at the bottom.

Actually, the washing machine, dishwasher and kitchen sink all use the same route when emptying water.

I'll google up HepVo. As there is so little space under the bath which sits low to the floor, I hope the device is compact enough to fit in.

seco services · 9 Nov 2010

sounds like your getting cross over from the kitchen waste to bath waste as the w/m is pumped when it drains.

hepv0

sotal · 9 Nov 2010

You could put the plug in the bath

HERTS P&D · 9 Nov 2010

Bad plumbing or blocked drain.

faizal · 9 Nov 2010

the pipe has not got enough fall on it maybe
maybe its back siphonage

ColinJac · 9 Nov 2010

I know of a block of flats with 9 floors including the ground. In the bathroom of a 1st floor flat, a 1.5" shower waste stabs into the cast iron drain stack. The basin is teed into this pipe using 1.25" pipe.

Every now and then the shower drain makes loud gurgling sounds. I think its is when the floors above flush a toilet or empty a bath and the suction pulls out the water of the shower tray.

What are the views of the professionals on this? Would a shower anti-siphon trap and HepVo trap on the basin solve the problem? There is only one 4" cast iron tee into the bathroom. which means both basin and shower have to be on the same pipe.

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Dirty water from washing machine flows up the bath plug hole

ColinJac

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