Can I reuse salt water for a second batch of Kim-Chi?!
Sure, why not. It's not like you changed the composition of this brine solution like adding more water or something. So, give it a go. Now, if it was a liquid marinade for meat then I would've said no because you run the risk of cross contamination.
I'm a personal chef.
Sure, it's recycling right?
You can re-use it to help save the planet!