Pure natural chitin (chitosan) is a substance extracted from the crustaceans of shrimps and crabs. Through special patented process and preparation method, formaldehyde can be removed and decomposed. Chitosan has a special structure, and its highly active amino group (-NH2) can react with many harmful gases. Therefore, toxic gases such as formaldehyde and TVOC escaping into the air can be captured and decomposed, and converted into water molecules (H2O) without secondary pollution, so as to finally purify the air. Using natural chitin as raw material, it can effectively adsorb and decompose free formaldehyde, patented nano formula, with a large number of positive charges, forming a strong adsorption force, which can quickly decompose free formaldehyde, bacteria, viruses and harmful substances. Achieve the special effects of mildew prevention, antibacterial, deodorization, smoke odor removal and ultraviolet protection, effectively prevent the breeding of germs and purify the environmental quality. Pure natural, non-toxic, pollution-free, and will not cause secondary damage.