Keep the air intake venturi flushed with boiling RO every couple of weeks! It really affects performance. (well, it's what I do anyway!)
BTW, can anybody tell me what the extra acrylic ring is for? - It's function is not immediately obvious, I must say.
The pump is now almost dead silent, for all practical purposes it is completely silent. The only way you'd be able to hear this skimmer is if you had absolutely nothing else turned on in your tank. My powerheads make more noise than it does.
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