eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?
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Water is generally inexpensive. That is why it is so often our “go to” thing to use for washing away waste products.
Water treatment is generally expensive.
If you are in a place where it is difficult to get water (Like in space at the the ISS) is may be cost effective to treat water for some level of recycling. **Generally it is not cost effective to recycle water.**
In my rural area it is so cheap to pump potable water out of the ground with minimal treatment before using it for any use including drinking.
We flush all water into our septic system where it goes back to the earth.
But the well and the septic system are required for living here, so using them once you have them has very little extra cost.
Adding an additional filtration / purification system would be a huge expense.
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