I got sent a great article today on backcountry water filtration and purification by a Katadyn employee, called
What’s in the Water?
The conclusion: if you want to be safe, filter and then purify using chlorine dioxide tablets. I’d skip the Miox though. I hear they’re unreliable.
Check out the article. It is very detailed.

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Aquamira Frontier Pro is an exceptionally lightweight 2 oz. alternative to the more bulky water filters and water purifiers available on the market to day. In comparison, my First Need filter weighs a hefty 15.9 oz.
The Frontier Pro connects to platypus bladders or plastic bottles. To get water, you [...]

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Most of the water filters carried by backpackers and long distance hikers cannot remove organisms smaller than 3 microns in size. While protozoa such as Giardia (shown below) and Cryptosporidium are about 5 microns in size, water filters miss bacteria such as Cholera, E. Coli, and Salmonella (0.2 - 0.5 microns) and viruses such as [...]

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I am a big fan of Platypus hydration bladders and I normally carry two, 3L bladders with me when I’m backpacking.

Platypus bladders are different from Camelback bladders, which I have used in the past, because they have a much smaller opening screw top openings. This is important when you are cooking and you need to [...]

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The First Need water purifier is one of the few filters on the market today that filters down to 2 microns. This means the it filters out all viruses, crypto, and protozoa without the need for additional purification tablets like Chlorine Dioxide. The only downside to this filter is that it weights 15 oz, which [...]

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