Yes, I came across those Pocari Sweat things when I started watching Korean programs on the internet. I had NO IDEA what they are but one of my FB friends told me it was like Pedialyte, and very gross. Suppose to replace the stuff you sweated out.
It’s Japanese and it doesn’t taste very good. I much preferred Aquarius, a competitor made by Coca Cola Japan. Pretty much tastes like Fresca.