Yes and no. Yes, because if it wasn't dumping the foam in the cup, it wasn't removing the waste that increases phosphates/nitrates. No, because the water being pumped through the skimmer should have created foam, so long as the pump was submerged in the water... what do you mean by 'neck of the skimmer'?
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-Jeremy
"Quidquid latine dictum sit, altum viditur"
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