From my experience as LEED (Leader Environmental & Energy Design) of Green Building Council chartered architect , 3 years ago I proposed a system similar to yours for a sustainable group of houses in Menorca Island.
Unfortanely, the owner (an English investor) didn't accept the idea of people drinking their own waste water, even if depurated and conveniently purified.
I think your system is very sustainable but can't be accepted by public.
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by giovanna barbaro