science

And it's very easy to make, you just need to ask Finland to get black metal

I got you. From the article:

Desalination can provide a critical water supply, but today's most common methods come with significant drawbacks. Reverse osmosis forces water through specialized membranes to remove salt, while thermal distillation uses heat to separate fresh water from seawater. Both approaches can consume large amounts of energy, often require water treatment before and after the process, and generate a highly concentrated salty waste known as brine.

When that brine is discharged back into the ocean, it can increase local salinity and reduce oxygen levels, creating harmful conditions for marine organisms.

In Professor Chunlei Guo’s lab at the University of Rorchester, researchers developed a solar desalination device featuring laser-etched superwicking black metal, a technology that produces fresh water from seawater while capturing salts and minerals instead of generating harmful brine waste. Credit: University of Rochester / J. Adam Fenster

Tl;dr - Different method for the same desalination, but keeps & transforms the waste into useful stuff instead of throwing it out

I don't know how regular desalination plants work, this method apparently works by evaporating water on a black surface, and the cool trick is that the surface is self cleaning, so the salt can be recovered as a solid.

To give an actual answer: put it in already hollowed out salt diapirs at the bottom of salt mines.

Sell it. People will pay for salt.

Humans: "we can improve nature" :D

I imagine the issue is the sheer amount of brine produced would require ginormous salt pans to drive off the last of the water, compounded by it taking take longer to fully dry compared to the time taken to desalinate an equivalent amount of water as salt is very hygroscopic.