How do u adjust the flow on the filter?

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I know on the aquaclear's you move to intake pipe side to side to increase or decrease but not sure about the whisper.
 
I have a Whisper 20-40 with a valve on the top of the intake to adjust flow. If yours doesn't have that then I suspect you don't have the ability.
I turn mine right off when feeding frozen brine and run it full bore the rest of the time.
 
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