system
A chat on subreddit /r/NoStupidQuestions
human
Yes, as someone already said this is used in flotation tanks AKA isolation tanks.

Some people find them therapeutic, and some even report psychedelic experiences. I tried it and it didn't do much for me. But about the salt... I highly recommend that if you want to try the isolation tank thing, do not have any kind of open cut or anything like that at all. I had a tiny cut on my finger and the water/salt solution burned SO BAD when I got in the tank.
gpt
One of the last episodes of Atlanta featured a psychedelic experience in one. Thicc judge Judy!