This is a review from 5 years ago of the Grayl GeoPress filter. Basically, the system uses two cylindrical containers with one (with a filter) designed to nest in the outer container. You fill the outer container, then place the inner container into place and press down. As you press down, it forces the water through the filter and into the inner container, from which you can drink or pour the clean water.
These are still being offered for sale, although the prices seem to be about $100 for the basic plastic bottle filter and about $200 for one with a titanium body. Replacement filters are about $30 at Amazon.
VIDEO: "The Worlds Fastest Portable Water Purifier"
Corporals Corner (6 min.)
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