>>Looks more like a coincident surface problem... (Given that there's
>>absolutely nothing to be refracted that could be generating so much
>>noise!) Does the liquid inside the bottle "touch" the bottle itself?
> 
> 
> Umm.. the liquid MAY be touching the bottle... perhaps. But it's just a
> cylinder so I could just slightly decrease its radius. But would making the
> whole bottle a union also remove it? :?

No, making it a union will have no effect. (Merge might - but that's 
usually *lots* slower.)

Try leaving a tiny gap between liquid and bottle and see if that fixes 
the problem. (If it does, will probably render a fair bit faster too.)

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