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NFC: A filter idea

I have always wanted to replace the standard impellor in an outside 
power filter with an archimedes screw.  I claim it would be much 
more efficient, with the side benefit of not being destructive to 
beneficial plankton.  Any thoughts on this?  Does anybody know 
how to fabricate such a part?


"Cry to it, nuncle. as the cockney did to the eels when she put 'em i' the
paste alive; she knapped 'em o' the coxcombs with a stick, and cried 'Down
wantons, down!'"