there's a diy method in the thread i linked to above.. last post. basically just an undersink filter run from a powerhead / pump with a micron cartridge and DE powder *OR* polyfill. very simple and straightforward to build. Water polishing just means filtering mechanincally to a very fine particle size (meaning you're using media with very small gaps for the water to pass through) so as to get the water very clear. Some tanks never seem to need it, others beg for it on a daily basis (i'm dealing with that right now with 2 tanks side by side). In any case, poke around, do a search on this site for water polishing, mechanical filtration, DE (diatomaceous earth, diatom powder), poly-fill, filter floss, and/or micron filters. That should give you a pretty good background on the process and applications.
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