Bought to make DIY cloth mask filters. That works great! I just used our masks as rough templates and cut out something like a pyramid to fit nicely inside our cloth face masks. Of course they've also been accidentally thrown in the wash with the masks a few times and really survived - I'll use them again then as hot water + soap should kill most germs. We usually throw away filters after a few uses or longer Exposure and store the masks with these filters in the car dashboard so they don't catch fire from the heat between uses.
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