Needle wheel skimmer pump. Air intake WHERE?

[solpete]

Ive got a resun king3 protein skimmer pump with needle-wheel. It came with air-intake adapters for both water-intake and outlet. Where do I put the air intake tube? Looking at the skimmer below in this figure of a NEEDLE WHEEL skimmer they put the air intake after the pump.

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But many needle wheel skimmers have the air-intake before the needle wheel....

Im confused!

I know that a fast-rotating object in water can cause small bubbles to be created because of the pressure-drop so It actually makes sense to put the air-intake after the needle wheel. But you can find arguments for putting it before the wheel aswell so that the air gets mixed up....

HELP!

 

[Willie McDaries]

it does typically go on the intake end of the pump, never seen one configured like in that pic...the impeller chops up the bubble and make them smaller

 

[solpete]

Just compared the resun with the aquabee... Much fewer bubbles with resun.. Perhaps because the aquabee has normal impeller

Finally