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

No there are toilets that have the sink above it and that water is used in the toilet. Stuff is just not set up that way, and you also need to consider often times you are adding complexity if you wanted to do say a shower. You probably want to move that water into a tank to be accessed later, but now you have to sources of water and need a system that supports two sources, take from grey water, if empty use regular water.