3 ms·

The article isn't clear where the metals are coming from. It could be that the desalination process simply concentrates what's already in the seawater.

• tfha 8y ago
  They add copper as part of the purification process
  • apo 8y ago
    What's the source? The article says nothing about it, and seawater contains copper and other metal ions all by itself: https://web.stanford.edu/group/Urchin/mineral.html https://web.stanford.edu/group/Urchin/mineral.html