All the while the sun shines and winds blow there’ll be a constant cycle of evaporation and rainfall. But weather patterns constantly shift, so that rain may not conveniently fall over the fixed location catchments supplying particular water distribution networks.  The ‘failure’ of rains to drop where wanted then leads to perceptions of water scarcity, and shortages affecting wide populations.

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Nobody chooses to live where there is no water at all – survival would be impossible. Where people are there’ll be water from some source or other, and obviously sufficient for them to be there in the first place. The main reason a house has a roof is to keep the rain off the occupants.

 

It’s better to disaggregate the demand so many don’t suffer from one network drying up, better still to be able to use efficiently what’s directly available to the site. Whatever the supply, in the event of periodic shortages there’s vital advantage in being able to recycle water on-site for re-use, safely, rather than the one-pass-through-use defining the waste of clean water the world over.

 

Which is what the IUS does, and uses heat sterilisation to guarantee the water is always safe to use, in both first use and recycle.