Filter system protects nose and mouth by keeping fine particle matter up to 2.5µm out. Active carbon layers helps with odor control. Replace filter every few days. If you find it hard to breathe, it’s a sign to replace your filter. Remove and discard filter before washing fabric mask. It’s highly recommended to hand wash gently with soap and very hot water, but it also can be machine washed inside a delicates bag on gentle cycle.
(copy and images from Banks Journal)