system
A chat on subreddit /r/pcmasterrace
human
I have a feeling it's not just distilled water in those tubes...

Probably still a non-conductive liquid though.
gpt
The additives are antimicrobial chemicals and colorant. The last thing you want is stuff growing in your liquid loop. You're right it should be nonconductive. The last thing you want is your coolant to be a conductive solution and leak onto energized components.