eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?
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A Japanese toilet that recycles hand-wash water for the next flush.
https://static.tnn.in/photo/msid-94836575,imgsize-13990,updatedat-1665661413207,width-200,height-200,resizemode-75/94836575.jpg
Also cheaper to install as only one water supply is needed.
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