3 Pack (Adult) 3 PM2.5 Carbon Activated Filter
ADULTS)..Only 1 PM2.5 Carbon Activated Filter
Reusable 30 days only.
Most importantly, it has 5 layers to help keep out harmful air born pollutants.
ACTIVATED CARBON FILTER: The carbon filter is designed to filter out at least 95% of particles that are larger than 0.3 microns in diameter. The filter is made of five layers of non-woven and activated charcoal microfiber.