The pleated filter media with high surface area removes particles as small as 1um in diameter. Filters are a perfect match for a 10" filter housing canister. Use for beer, wine or any beverage needing filtering.1 Micron Filters should be used for a final, ultra-clear polish. Use only when beer or wine is already very well settled. Excessive yeast or sediments in solution will quickly clog up a 1 micron cartridge.