This object is just a simple lathe. The trick is normal{function{...}}. 
I used usual granite pattern turned around Y axis on angle depending on distance to
that axis. 
The clother point - the more angle of rotation. Translating this pattern downwards
makes effect of "screwing" the water into deep.
If anybody wants, I can post sources.

Sincerely Yours, Alex Kluchikov.

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