For my household drinking water, I buy 3M 0.5micron filter cartridges from amazon.com for about US$30+ which provides 6 months of filtered water supply. I pre-filter it with the regular 50micron water filter (similar to the link below).
if you are looking for a freshwater micron filter for aquarium, then why not adapt regular household water filters as micron filters?
something like this. Instead of using it as a CO2 reactor, you install the usual micron filter:
http://aquatic-art.blogspot.sg/2008/...2-reactor.html











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