i think the treatment of ...

i think the treatment of water for re-use is somewhat snapped up by intent to produce profit, by providing a solution for sale.

treatment of water perhaps needs to be looked at by example. i.e how does nature deal with the process.

it could be the evaporation cycle perhaps, and can this be replicated. does it need to be on large scale process or can it be done on an individual level as in a collective of many.

I think we need to be aware that most or all functions that happen within nature on this planet are within a cycle or regenerative process. this does not mean that the process returns to an original state for what it was intended for but as a key component of the overall purpose still.