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Originally Posted by beaker020
all you've done by increasing the head (actually; lift) is reduce the flow just the same as if you were closing the valve. The skimmer doesnt run any better, it just makes you feel better because the valve is open like it 'should' be. A better approach is to make a short riser for the collection cup out of PVC or ABS. This will allow you to run the valve full open AND get full flow at the same time.
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Hi, I agree with you that what I've done is increase the head. But also, the pump is spinning the same speed and drawing the same amount of air just drawing less water. I find the change in water to air ratio is what increased the performance. I can definatly see the differance in the foam in the collection cup. I have nice dark and dry skimmate.