What are the other types of filters in air purifiers besides HEPA filters and activated carbon filters, and what are the characteristics of each of them?

In addition to HEPA and activated carbon filters, there are several other types of filters in air purifiers, each with different characteristics:

1. primary filters: Usually used as the first layer of filtration in an air purifier, it consists of a screen-like material that mainly filters out larger particles such as dust, hair and fiber fluff. It serves to protect the subsequent filters and extend their service life.
2. photocatalyst filter: This filter uses nanoscale titanium dioxide as raw material, which is able to produce a catalytic effect under light to decompose harmful substances in the air, such as formaldehyde and bacteria. It can decompose harmful substances into harmless water and carbon dioxide.
3. plasma dust net: An electric field is generated by a high-voltage power supply, which causes airborne particles to become electrically charged and are then adsorbed by oppositely charged dust collection plates. This filter effectively removes fumes, smoke, bacteria and respirable particles from the air.
4. Formaldehyde Filter: Specifically designed to remove formaldehyde and other volatile organic compounds (VOCs). These filters are often used in combination with activated carbon filters to increase removal efficiency.
5. Humidifying Filter: In some air purifiers, humidification filters are used to add humidity to the air. These filters usually have a honeycomb structure and are able to trap dust in the air while humidifying it.
6. Electrostatic Electret Filter: This is a type of filter that utilizes the principle of electrostatic force to adsorb particles, and it features low wind resistance and high efficiency to capture tiny airborne particles.
7. Nanomaterial filters: A filter made of nanotechnology with high adsorption capacity and antimicrobial properties to remove airborne bacteria and viruses.
8. Mineralization Decomposition Screen: These filters use special materials that break down harmful substances in the air without creating secondary pollution.

When choosing an air purifier, you should select the right type of filter according to your personal needs and environmental conditions. At the same time, regular inspection and replacement of filters is the key to keeping your air purifier operating efficiently.