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

Grey water can be used to reuse water in a building multiple times before it exits the building through toilets and other drain points.

The most uses out the water can be:

Drinking water or other clean water use (showers, sinks, laundry)

Sterilize with UV/ozone treatment

Drain to Planter and water plants.

Drain the excess to toilet usage – and then out of the building. Depending on where you are this goes to city water reclamation or a septic tank. and the run off from the septic tank can be used to water gardens, lawns, etc.

You can also introduce rain catches into this and introduce that water at the planter tier.

I am skimming over a lot of discussion about the technical requirements, piping and implementation.