I used a Katadyn filter in the Himalaya and never had a problem. On a previous trip I relied on boiled water and ended up with Giardia an anerobic bug with what can only be described as catastrophic consequences and can take three months or more to shift ,believe me, not pleasant.
I know Katadyn filters are expensive but after having Giardia I know you pay either way... from experience I prefer the cash alternative, enough said!!
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'We are all in the gutter, but some of us are looking up at the stars' Oscar Wilde
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