How it works?
The pack contains a cotton mask and four PM2.5 filters. You must understand why PM2.5 filter is important. The cotton material can filter out only bigger dust particles, but they are not able to filter out dangerous PM2.5
You must also know what is PM2.5. PM2.5 are the smallest of the particles that is 1/70th size of human air. Because they are so small, they can penetrate deep inside the lungs and that become the major reason for all respiratory diseases.
To filter out PM2.5, PM2.5 filter is provided that needs to be inserted in the cotton mask. The cotton mask is washable and each filter has life of approximate 20-25 days under normal conditions. Within the pack, four filters are provided for your convenience. If additional filters are needed later, they can be purchased separately.
In a nutshell, this becomes a reusable mask with replaceable filters.