I don't filter anything that would require the same features/functions as say a medical counterpart but I can confirm that filters really work. I've run them individually and in pairs through a Buchner funnel with a vacuum pump (actually just a rebranded aquarium pump lol) with great success. I've had the desired results, which is the removal of small particles of Everclear. Be warned though, although StonyLab makes these filters and presumably Buchner funnels (I stamped a mm funnel just above the sticker that reads "StonyLab 100mm"). that's ridiculously crooked) these 94mm are too big to lay flat in their 100mm Bรผchner funnel. TL; DR - They do their job at the perfect price.
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