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The Guardian G-Volt claims to be the best filtration system available in mask form, developed with over 5 years of testing with a laser-induced graphene filter to trap and repel viruses, bacteria, and other pollutants. The mask employs a low-level charge via USB and has been tested in university labs which showed it to be 99% effective against particles greater than 0.3 microns and 80% effective against smaller particles.
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Source link https://uncrate.com/guardian-g-volt-graphene-breathing-mask/