Background:
This technique was developed by the navy as a way to save water on ships. They did this because when they were at sea they cold only hold so much water. This saved more for drinking and cooking.
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How about the "nay-sayers" try walking 1 mile and CARRYING every litre of water they think they need. They might decide it was worth saving the resources then.
that's only true if the water goes to it's natural place.
but humans were stupid, and tried to treat it, instead of letting it evaporate, and let the earth purify it.
of course, that treating takes up energy, and the water will eventually go to the ocean, but until then...
70% of the planet may be covered by water, but only a tiny amount of it is fresh, and only a tiny amount of that is drinkable (by modern standards).
Much of the rain that falls, falls on the sea, so is instantly rendered salty. Other drinking-water supplies are taken from water-tables (wells etc), which are falling faster than they are being replenished (you know all that stuff on mineral-water adverts about water being percolated through mountains for thousands of years? Think about it...)
All the water from your tap has been treated to be drinkable. That costs money, energy and chemical resources. Yet most of the water you use goes down the toilet, is used for washing (dishes, clothes, you), or gets sprayed on your garden. None of those uses require drinking-quality water.
Anything which saves tap water saves one of the most valuable (dwindling) resources on the planet.