Active purification methods include negative ions, net ions, photocatalysts, cold catalysts, and electrostatic dust collection. This type of purification principle is through a chemical reaction to formaldehyde toluene and other harmful chemicals decomposed into non-toxic water, carbon dioxide, etc., or fine particles adsorption. This type of way back to produce ozone, a certain concentration of ozone can be sterilized and disinfected, but a little higher on the human body is harmful.
Passive purification is hepa filter and activated carbon filter, hepa filter adsorption particles, activated carbon adsorption formaldehyde and toluene. This type of method requires regular replacement of the filter element, otherwise it will be adsorbed full back to the overflow, resulting in secondary pollution.
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