I wish those filters would be banned from the marketplace. They give people a false sense of security and therefore may put more people more at risk. 

They are not certified by a lab. A Chinese manufacturer used a stamp on this cut material, but there is zero lab certification of these products or the packaging. It's all a sham

There is zero regulation of this stuff in China. Who knows what's in this product and what the effect is. No one is regulating. Don't trust it

Activated carbon works to filter microparticles. There is not enough activated carbon in these filter products to actually be of any benefit. Again, there's no lab certification or ingredients list on these things. Fraud