The cone does not facilitate a swirl. The cone forces water to flow more evenly away from the tip of the cone, it does not do anythign to help swirl the water. To prove: take a hose, take a cone, turn hose on above the cone, watch water go away from center of the cone. Now the outlets, they don't cause spinnage either, they cause water to be pulled towards them, straight. To prove: Take a bucket with water (sprinkles if you want too hehe) punch some holes, watch the water flow out the holes.
Put these two separate things together, and presto, you get even water distribution, and bilocational water collection; I believe gone_fishin's diagram would be fairly acurate.
The main thing is that, not all the water flows in the same direction, this is why no swirl will occur. By using a clock, outlets at 2 and 8, if you want clockwise rotation, look at 3 and 9 the water in those zones will be going the wrong way! (counter-clockwise) the same problem occurs with the opposite direction.
My .02.
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