25 nm "cloth"

I am looking for 25 nm "cloth" (I'm using that term loosely) my goal is to create a cheaper water filter similar to "LifeSaver bottle" (https://en.wikipedia.org/wiki/LifeSaver_bottle) which is $139
 

f95toli

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That is not a very well defined question.
25nm of what? A metal?
What kind of substrate should it be attached to?
What size do you need?
 

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