Is a million gallons long-term enough for your water purification needs? LOL

And it filters out viruses to boot...

I've been looking at Sawyer Water Filters for quite a while now, and recently they added the Sawyer Complete Water Purifier Sytem: Viral (SP194) to their lineup.

.02 Micron Absolute Filter
Gravity Fed
Viral Filtration to 99.9997% (>5.5 log)
Biological Filtration to 99.99999% (7 log) bacteria and 99.9999% (6 log) protozoa
1 Million Gallon Guarantee

I'd still put an activated carbon cartridge backup on it for chemical filtration, but otherwise this system looks great.

the 4 Liter setup runs about $140.00 at Bass Pro Shops.
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"Learn survival skills when your life doesn't depend on it."