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Any simplified rainwater designs for loo's nowadays?

Posted: Thu Jul 08, 2021 8:02 pm
by Mr Gus
Owt changed?

I'd like to be able to divert some roof run off (near a loo) to my downstairs WC but have a feeling the same old grey water near a potable is still a no-no? ..considering when this was last discussed on a forum in a galaxy far far away have things changed in light of climate urgency?

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Thu Jul 08, 2021 8:25 pm
by Stinsy
As far as I know BS8525-1:2010 is still in effect, unchanged. My understanding is that so long as any taps are labelled all is good. I don’t think you’re allowed to use grey water for hand washing, that is a dealbreaker for many toilet use-cases because the need to run portable and grey makes it too expensive.

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Thu Jul 08, 2021 10:56 pm
by nowty
I installed a completely separate pressure pumped plumbing supply to my toilets and outdoor garden taps. If it goes wrong, I can re-connect the upstairs toilet by physically disconnecting the grey water pipe and reinstating the original potable water supply. I think that is enough to abide by the regulations as the supplies remain completely seperated.

Maybe I need to label the outdoor taps as non potable water. :?:

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Re: Any simplified rainwater designs for loo's nowadays?

Posted: Fri Jul 09, 2021 9:16 am
by Mr Gus
If that is deemed acceptable then that is indeed doable, no cited concerns about interchanging the two from a microbial aspect?
(I was under the impression there would need to be two water inlets & proximity of one to the other was part of the concern? ..hope i'm wrong)

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Fri Jul 09, 2021 3:38 pm
by nowty
The main issue is to prevent backflow from the greywater system to the potable system which is what I have implemented.

Good simple info found here.
https://www.eswater.co.uk/globalassets/ ... advice.pdf

And some other info from the Environment Agency, found here,
https://sswm.info/sites/default/files/r ... 0Users.pdf

Looks like I am OK, apart from needing to colour code the pipes and add various labels to things.

Another job to add to the long term "To Do" list. :cry:

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Fri Jul 09, 2021 3:58 pm
by Mr Gus
Thanks nowty, I'm currently clearing my back garden (Bee & blackbird heaven) as we gave it over when the local bird songbird populace went into decline, having seemed to recover over a 10 year period i'm hacking it back to its original purpose which will likely involve a few 000 litres of water storage my loo is fittingly close & as it is my own personal jump off point for a visit to the spice islands I don't think i'll get complaints :lol:

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Fri Jul 09, 2021 11:11 pm
by Joeboy
Remotely related. We used toilets similar to these in Japan. Have a dump, wash hands, hand water fills cistern for next customer.

https://www.wholesaledomestic.com/combi ... zwQAvD_BwE

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Fri Jul 09, 2021 11:18 pm
by nowty
Joeboy wrote: Fri Jul 09, 2021 11:11 pm Remotely related. We used toilets similar to these in Japan. Have a dump, wash hands, hand water fills cistern for next customer.

https://www.wholesaledomestic.com/combi ... zwQAvD_BwE
Wow, thats such a good idea and so simple, especially in terms of plumbing.

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Sat Jul 10, 2021 6:45 am
by Stinsy
I saw those in Japan. Seemed elegantly efficient.

Re: Any simplified rainwater designs for loo's nowadays?

Posted: Sat Jul 10, 2021 9:25 am
by Joeboy
Stinsy wrote: Sat Jul 10, 2021 6:45 am I saw those in Japan. Seemed elegantly efficient.
Many kinds.

https://www.familyhandyman.com/article/ ... ves-water/