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

It certainly *can* be, but in most places it’s not done simply because it would add more complex plumbing and filtration systems, which adds costs and more possible points of breakage/failure.