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I have been using a Timberline filter since 1991. I Haven't weighed it but it is seriously lighter than any other I've handeled. I believe it filters down to 0.4 microns and that's enough for giardia. I know about a dozen hikers that have been using them and no one has contracted anything.
Best of all, the price has ranged from $21 to $30 since I got my first one. My last one was $22.50. Replacement filters are presently about $14.
With proper care (backwash, purify with Chlorox and let dry thoroughly, when you get home) The filter lasts me about 4 years, at about 30 days per year, on the trail. The pumps are dirt simple and last about 5 or 6 years.
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