best .02 micron water filter for no elec.

I have .2 micron filters, but need a good .02 for viruses ect. I have the sawyer camping filters, and also some bucket filters: http://www.homespunenvironmental.com..._p/bc-0503.htm
...but I need something in case it really gets hairy with water supplies, and I need it to work without electricity. The best I can find is this sawyer: http://ift.tt/1WJVLq4

I would love to hear recommendations for a good filter.

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best .02 micron water filter for no elec.