19 Jan Go anywhere water filter – LifeStraw

Because a week’s worth of Perrier takes up took much backpack space there’s LifeStraw – the easiest, most convenient, simplest and by far away smallest and lightest water filtration system you can take with you. Half the size of a school recorder and weighing next to nothing just drop one end of LifeStraw into contaminated water, or just water you’re not 100% sure about (mountain streams/snow melt), and the internal fibre membrane traps poisonous pathogens. It works like like a conventional straw, without any of the pumping associated with conventional filtration systems. You can drink directly from a water source or fill a canteen and use LifeStraw with that.
The makers claim, borne out subsequently by independent tests, that LifeStraw, eliminates 99.99999% of waterborne bacteria, and almost as many water borne protozoan parasites down to 0.2 microns in size. This exceeds the EPA standard for removing all the usual waterborne nasties E.Coli, Giardia and Cryptosporidium of 1.0 microns. In other words there is always a very slim chance that something might slip through the net. On the other hand you get knocked down by a bus or eat a dirty prawn.
LifeStraw is claimed to be good for 1000 litres of filtered water before the filter needs replacing; more than enough for a couple of weeks off the beaten track.
£20.50 (£14 replacement filter) / waterlife.com