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Absorbent cotton wool is a good bio-compatible example, but it has low availability in the US and is not reusable.

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  • $\begingroup$ A sponge is another example. $\endgroup$ – Solar Mike Dec 29 '17 at 21:25
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reticulated (i.e., open-celled) foams of polyurethane are excellent for this purpose, and commercially available in bulk. their nominal pore sizes can be specified as well.

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