It's actually way easier to treat sewage than it is to desalinate water: https://www.waterandwastewater.com/how-is-desalination-different-from-water-reclamation/
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That's because human perception exists on a logarithmic scale! It's called the Weber-Fechner law, and it was one of the first studied psychological phenomena, before psychology as a field was even defined.
Interestingly, our sense of the "bigness" of numbers is also logarithmic. This is why there have to be explicit explanations of the massive difference between a million and a billion - our brains instinctively and erroneously think "eh, it's like double."
edit I can't type