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I am trying to design a bathroom capability to have a urine diverting toilet.  The bathroom will also have a sink.  I was hoping to run the sink water, and urine, into a filtering greywater system.  I was told by a toilet marketer that all states have deemed urine, greywater.  i.e. that urine can be included with sink water and be filtered through a greywater system (I cannot confirm that).  I cannot find any references to the above…only definitions that greywater consists of ‘water’ from home applications.  Any input greatly appreciated.

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Hi,

I’ve never heard anywhere that urine is considered greywater. What state are you in? If you’re seeking a permit for the urine diversion into the greywater system you’d need to talk to your local regulator and see what they think.

If you are combining urine into the greywater system you’ll have a much higher nitrogen content and will need to be mindful of your ground and surface water situation to ensure you don’t cause nutrient contamination.

I discuss these considerations in the composting toilet chapter of my book, The Water-Wise Home, which could be useful to you.

Good luck with your project!

 

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