In reply to UKC/UKH Gear: Looks good for mountain use, but doesn't remove chemical contaminants like some others do (e.g. Travel Tap). Even in the mountains, I often collect water from streams at the bottom of the hill to drink on the way up. If it's anywhere near a farm, it could well have pesticide/nitrate contamination.
Edit: Had a quick look on Amazon and it seems more expensive than competitors.
> Looks good for mountain use, but doesn't remove chemical contaminants like some others do (e.g. Travel Tap).
Have you any idea how it does that? I did quite a lot of reading before I wrote this review https://www.ukclimbing.com/gear/review.php?id=8426 and it seemed chemical contamination (maybe because its such a wide range of contaminants and some can bond to the water at a molecular level?) was actually the hardest thing to remove - expensive purifiers like the MSR one don't. So I wonder how a 30 quid filter system does?
It does seem to have been tested by reputable labs. Given the calmed large number of sales, I think if it didn't work we would have heard about it by now.
It looks like they have a tertiary stage of some sort, like granular activated carbon (GAC) that will adsorb the chemicals, whereas the filter you reviewed just had the membranes.
Out of interest, how do you know if some of the membranes have failed? I would assume that as it gets used a lot, the membranes start to clog and some may burst under pressure, letting it pass dirty water.
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