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

Among the other things people have said, wastewater systems works with gravity, so if you want to have such systems, you’ll have to pump water from your shower into a specific tank that will then emptied in the toilet’s tank, which adds to the complexity of the building and takes up a lot of space and energy for minimal gain in most cases.