It's easy to tell what exactly can be caught by a filter making filter "disclosure" easy. Either
the critters are bigger than the filter or they're not. For instance, giardia are pretty huge,
so just a filter works well grabbing most of them. There's going to be more variability with
the chemical treatments: which chemical treatment is used, water temperature, pH, water
chemistry. Iodine is really common, I've used it a bunch, but it tastes gross. In addition to
tasting better than iodine treatments, chlorine dioxide solutions (e.g. Aqua Mira) are
actually quite effective against cryptosporidium, unlike the iodine products. When you get
down to the tiny viruses, typical filters are useless. Even chemical treatments aren't great.
In fact, many viruses survive even big city chemical treatment plants. They are best
inactivated by boiling the water, if viruses are even a problem where you're hiking (they're
no biggie in the Sierras). Sorry, I know nothing about tapeworms. Maybe the eggs are big
enough to get caught in a typical 0.2 micron filter?? UV treatment kills off all sorts of stuff.
I take advantage of that by filtering surface water from lakes (or just under the surface if
there's a lot of pollen or other floaties). A nice double-death-whammy.
--- In firstname.lastname@example.org, "Andy Mytys" <amytys@...> wrote:
> Actually, the only thing that Aqua Mira says is that "If water is very
> cold, cloudy or tinted let stand 30 minutes."
> I can't say for sure if its affective against cryptosporidium,
> tapeworms, or viruses. I do know it works against Giardia.
> I must admit that I find it more that slightly troubling that I can't
> find any official information on the web as to what exactly Aqua Mira
> is good for, beyond making water "taste better" in some cases,
> preserving stored water, and killing bacteria in water.
> I wish that these chemical oompanies had disclosure to the level of
> filters, where you're told what the product works on and, more
> importantly, what it doesn't work on.