Have you ever used micron filter cotton to purify the air?

The company bought it once on 20 17, and the quality was very good. Now we have been working together. It seems that there are many kinds of filter cotton with primary effect and activated carbon, and there are also various filters with primary effect, medium effect and high efficiency. Our company contacted all customers in advance to see the products. They all have factories, so we should be able to visit them now. Just contact them in advance.