What exactly is happening here.

zincoxide

Member
In the attached image can someone please explain to me how exactly the water is pumped out of the skimmer?

I understand the concept that the water is pumped in through a venturi valve which creates the air bubbles. Then the air/water mixture travels down to the bottom of an internal reaction chamber where it then travels up and the clean water back down to the bottom of the external reaction chamber.
My problem is, I don't understand how it actually exits the bottom exaust?
Can someone please explain?
 
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