I heard that fine dust masks are disposable, so I should throw them away right away if I use them once.
Do I have to use them only once?
If I used it for a while, can I reuse it?
I used it for about an hour, but I don't want to throw it away.
Can I just shake it off and use it?
864 2018-04-02 Gentleman
It's disposable, but I'm not saying you should use it only once. You can use it many times. You can't just wash it.
When you wear a fine dust mask, the color starts to change. If the color is not too dirty, you can keep using it. If you use it for a long time, you'll get a sense of what color it's going to be and how much it's going to be.
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