The Renewable Energy Hub Forum

Renewable Energy => Rainwater Harvesting => Topic started by: LucidEnergy on November 25, 2015, 12:36:04 PM

Title: Rainwater for toilet flushing
Post by: LucidEnergy on November 25, 2015, 12:36:04 PM
Is there anywhere in the world that commonly uses rainwater for toilet flushing? I know that seeing as it is greywater, it is suitable for toilet flushing, but I've never known it to happen in England. But I thought in more arid places this might be something that is more common.
Title: Re: Rainwater for toilet flushing
Post by: allegrif on November 26, 2015, 04:29:42 PM
This sounds like common sense to me, and I think it should be a legal requirement in new buildings. For example, I think a large block of flats or a large commercial building/skyscraper should have rainwater collecting facilities built in, which can then feed the toilet plumbing. In fact I don't understand why this isn't widespread already, surely it would save everyone money?
Title: Re: Rainwater for toilet flushing
Post by: LucidEnergy on November 26, 2015, 04:45:59 PM
Using it in a block of flats seems like a good idea. There could be a separate grey water tank which provides free water to people's toilets, in addition to the metered clean water they use for other applications.
Title: Re: Rainwater for toilet flushing
Post by: St Rhenium on November 26, 2015, 04:55:56 PM
I agree. Having separate plumbing systems in older buildings might not be feasible, but there is absolutely nothing stopping them being designed into brand new buildings. It's almost treacherous that this isn't widespread already.
Title: Re: Rainwater for toilet flushing
Post by: JamesH on November 27, 2015, 12:27:46 PM
I don't think it would even be that hard for older buildings, just one more pipe coming down from the gutter to a tank, then to the cistern. Maybe there are things I haven't considered but it doesn't seem too much hassle.