That’s what I thought too, but this system doesn’t actually use salt water. It uses a membrane that’s filled with lithium bromide (a “salt” in the chemical sense of the word), which absorbs moisture from the air while the computer is off and then is able to slowly “sweat” the moisture away while the computer is running. They say it can run for about 6.5 hours before needing to be recharged.

This is pretty cool for data centers which use massive amounts of power to keep everything cool, because it’s passive and doesn’t use any extra energy for fans or water pumps or anything. It really isn’t all that great for consumer PCs though, because it’s a lot easier to deal with waste heat.