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How xylem filters work

This video illustrates how the naturally occurring xylem tissue in plants can be used for filtering water. The xylem tissue transports water and nutrients in plants and is present in trunks and branches. Structurally, the xylem comprises of conduits that are inter-connected to one another through porous membranes present on their sidewalls. The pores range in size from a few nanometers to a few hundred nanometers and are typically much smaller than several contaminants present in water such as dust, bacteria and protozoa. A section of branch or trunk that is longer than the length of a single conduit will force the water to pass through the pores, which can entrap contaminants larger than their size. This piece of branch can therefore function as a water filter. For further details, visit www.xylemwaterfilter.org. Video credits: N.R. Fuller, Sayo Studio Copyright 2021. Krithika Ramchander, Rohit Karnik, Megha Hegde, Kendra Leith. All rights reserved.