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Two blue shop towels (available at Home Depot, AutoZone…

Two blue shop towels (available at Home Depot, AutoZone...

Two blue shop towels (available at Home Depot, AutoZone, Harbor Freight, etc.) have been tested to be an effective filtration medium, filtering up to 95% of 0.3 micron particles.

Cotton masks are less effective, filtering 20%-60% of 0.3 micron particles, and need a filtration medium sewn into them, or a pocket to add a filtration medium into.

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