Peeing right after doing UT

I've noticed that when drinking my water, I usually pee right after. I usually drink that as well - but, what's up with this?

It didn't happen when I only drank a small amount, now I do maybe 12oz. at once.

I would think the body is just sending it right back out since it's gravity is the same as urine (obviously it is urine, but you know what i mean).

Thanks for any advice/anecdotes.

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