Oh, the riser tube has that angled cut so you are closing it that way. Got it. It really doesn't matter how much it is closed considering that some water will come out and the water in the skimmer is getting skimmed. Instead of 300gph going through it, it might be more like 100gph (WAG on my part). If 100gph flow through it, that would be 2400g skimmed a day.
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Marc Levenson - member of DFWMAS
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