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Not new, but nevertheless works without power or high tech parts, being very low cost, reliable etc. Clearly a case where less is more.

This is a lesson for those who are trying to achieve the same thing with "more", obviously with high-stupid-tech.

I think, with such easy, simple, low-cost solutions to water problem (in large scale), there won't be any water crisis in a few decades as many predict, saying that water will be "the most expensive liquid".