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It basically follows the principal of a penductor.
The pump passes water through a channel.
That channel has inlets on the side to allow the power of the pump output to act as a suction, or venturi if you will.
This is where the increased flow comes from. The additional water being forced, or rather, suctioned through the inlets as the pump output passes through.
Try not to cut your pieces too thin as you will lose the "channel" effect.
DIY instructional pics incoming. Don't hold ur breath :P
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