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A team at MIT has "discovered" that sapwood is an effective water filter (duh!) All you need to make a water filter is a plastic funnel, epoxy, and a stick.
http://web.mit.edu/newsoffice/2014/need-a-water-filter-peel-a-tree-branch-0226.html
MIT group shows xylem tissue in sapwood can filter bacteria from contaminated water.
If you’ve run out of drinking water during a lakeside camping trip, there’s a simple solution: Break off a branch from the nearest pine tree, peel away the bark, and slowly pour lake water through the stick. The improvised filter should trap any bacteria, producing fresh, uncontaminated water.
http://web.mit.edu/newsoffice/2014/need-a-water-filter-peel-a-tree-branch-0226.html
MIT group shows xylem tissue in sapwood can filter bacteria from contaminated water.
If you’ve run out of drinking water during a lakeside camping trip, there’s a simple solution: Break off a branch from the nearest pine tree, peel away the bark, and slowly pour lake water through the stick. The improvised filter should trap any bacteria, producing fresh, uncontaminated water.