eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?

Question

eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?

In: 797

Answer 1

A big one is the existing expectation of it being clean water. Dealing with all the bits and stuff in the gray water would just make it all so much more difficult. I could just see apartments flooding cuz something in the upper tank got clogged or bound or something from some loose strands of hair out of the shower. Only place I could see something like this being viable would be in places that are extremely stressed for water and can afford to outfit all their with a more robust model.