1. The adsorption filtration, activated carbon 

Activated carbon is a porous material containing carbon, it has a highly developed pore structure, the porous structure of activated carbon with large surface area, can contact fully with gas (impurities), thus giving the peculiar to the activated carbon adsorption performance, make it very easy to achieve the purpose of absorption collected impurities. Just as a magnet, all have mutual attraction between molecules. 

Disadvantages: ordinary activated carbon adsorption toxic gas, so don‘t low efficiency, easy to take off the attached. 

2. The mechanical filter, HEPA net 

HEPA in Chinese means high efficiency air filter, reach the standard HEPA filters, about 0.3 micron efficiency reached 99.999%, HEPA net is the feature of air can pass, but cannot pass tiny particles. 

HEPA filter by a pile of folding of the before and after continuous glass fiber membrane, the formation of wavy gaskets are used to support filter placement and quality. 

3. Electrostatic purification methods 

Working principle: tungsten wire is continuous release of high voltage electrostatic electrostatic precipitator, let the air in the dust and bacteria with the positive charge, and negatively charged plate adsorption. To filter was a little dust, smoke than cell. To protect the respiratory system, and greatly reduce the risk of cancer. 

Advantages: simple to use, use one or two weeks later, can wash out the black dirty water, slowing down without secondary pollution. Is not to replace the expensive consumable materials. And can be static sterilization. 

Electrostatic tungsten filament release 6000 v high voltage electrostatic, instant kill bacteria, viruses and pollen. And all kinds of infectious diseases are very effective for eliminating cold.