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The ordinary masks (FFP1) only stop 70% of 5 micron particles; it need higher dust levels to handle air pollution, medical health and the different working condition. By switching washable filter case rapidly, we could easily covered the needs of dust levels FFP1 ~ 3 , and with a carry bag, you could arrange the needing or backups for emergency situation, for example against prescription we got a filter case with a container for inhaled drugs , it also cause less mold growth then face masks.
Hsan Pao Huang,
Chou Yi Che,