Hey all I have an issue in the two 2 pic's below theres jet or world pool like action coming from my gpu no idea whats causing it and no air is getting in. as far as I can see. but this is what it looks like coming out.
But in all seriousness, wouldn't that have to be air? The only reason it's visible is because there's another medium in the vacuum the rotation causes. If the water itself were swirling, you wouldn't be able to see it.