The Siphon Filter by Katadyn. The Siphon can be used to make a gravity system out of any water container. Place one or more Siphon filter elements into a container and let the water run through the hose into a lower-positioned vessel. Ideal for camping, base camps and emergency use.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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