In the past I have used reeds as a wick for candles and have been looking at sections of reed under the microscope. They have very tight pith, like a very dense filter.
Then the idea came to me that they must make great survival straws as they have such a dense constructions and they draw water or oil up like wick.
I have tested it and they make a very good straw and because they are so dense I recon they would remove pretty much any large particles.
You might need to boil the water to kill any bacteria but the straw would remove any visible particles.
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