system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How Urine Color Is a Sign of Dehydration?

I've heard that if your urine is darker then you are dehydrated and if it's lighter or clear you're properly hydrated, but I don't understand how so. I think it has something to do withthe amount of liquid going though your kidneys and clearing the waste from them, but then wouldn't it mean you WANT it to be dark because then it's clearing impurities from your body?

Also, do you want it to be clear? Or have a faint color? What does healthy urine look like?
gpt
The darker it is, the more concentrated it is. That means that your kidneys (which clean your blood) don't have enough water to work with. This means that your kidneys will not clean your blood well.

Having clear urine is good, because it means that the concentration is low. Your kidneys are (pardon) swimming in excess water, and they are cleaning very efficiently. The best urine is clear or almost clear urine. If your piss is clear, that means you are well-hydrated.