There are two types of filters available : 94% with super low breathing resistance and is therefore the most comfortable. 96% is more protective (1% more protective than N95 mask) and is a bit more breathing resistant. Depends on the situation and usage, you can change the filters easily:
How to change Totobobo filter?
More instruction of use:
Click on pen to 
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When do you change the filters? Please answer.
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