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

The reason is cost. Think about it. How would you get this shower water into the toilet tank? And how are you filtering it?? Water is most places is very very cheap