The pre-filter, activated carbon filter and HEPA filter of the air purifier each have different functions, and they can achieve the best purification effect only when they are combined. Here is an explanation of their functions:

1.Pre-filter (primary filter)

• What is it used for?

Mainly blocks large dirt, such as dust, hair, pet hair, lint and other floating objects visible to the naked eye.

It is equivalent to the "first line of defense", which first blocks coarse particles and protects the high-level filters behind, so that they will not be blocked so quickly.

• What should I pay attention to?

It is usually a mesh structure, which can be disassembled and washed or cleaned with a vacuum cleaner. It is not expensive to replace it with a new one after a long time.

It is recommended to clean or replace it every 1-3 months. If there is a lot of dust in the house, it should be cleaned more frequently.

2. Activated carbon filter (deodorizing filter)

• What is it used for?

Specially used to deal with various odors and chemical odors, such as formaldehyde from renovations, oil smoke, cigarette smell, and toilet odor.

But it is completely useless for particulate pollutants such as dust and PM2.5.

• What should I pay attention to?

Activated carbon is like a sponge. It will not be effective when it is full. Generally, it needs to be replaced every 3-6 months.

If your home has just been renovated or someone smokes, you can choose a model with a thicker activated carbon layer.

3. HEPA filter (high efficiency filter)

• What is it used for?

It specifically captures tiny particles, such as PM2.5, bacteria, viruses, pollen, pet dander and other invisible things.

It is especially useful for people who are prone to allergies and asthma.

• What should I pay attention to?

It cannot be washed with water! It must be replaced after six months to one year of use, otherwise it will be blocked and affect the effect.

When buying, look for the H11-H13 grade. The higher the number, the stronger the filtration (but the greater the wind resistance).

• How do they work together?

• Air purifiers usually filter like this:

Large particles → Pre-filter blocks → Odor → Activated carbon absorbs → Fine particles → HEPA dries

Only by filtering layer by layer can the air that comes out finally be clean.

• Some purifiers have ultraviolet sterilization function, but this alone is not enough, and it must be used with a filter.

• When buying, consider your needs: choose thick activated carbon for strong deodorization, and choose high HEPA grade for anti-allergy.

Nanjing TC Tech Co.,Ltd. is specialized in the development, research and design of advanced environmental technology and related products.
With our highly trained R&D staff and customer service, our company is able to offer various filtration products and designs, as well as comprehensive services to customers all over the world.

*Products can be customized, not limited to the ones listed on this website.