I'll stick to my (saturated solution of) Iodine, thanks.  With those 
dwell times my Iodine solution is effective (my sources say), cheap (way 
less than USD 130) and reliable (no batteries).  If the taste bothers 
me, I can add a few drops of Sodium Thiosulfate solution (making sure 
not to contaminate my purification container) and voila.

Dave

Peter wrote:

>
> Then they have this:
>
> http://www.nitro-pak.com/product_info.php/cPath/40_72/products_id/820



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