How often should the filter element of air purifier be changed?

     How often should the air purifier filter be replaced? Depending on the frequency of use, the replacement time is also different. Basically, it is replaced once every 3-6 months. It is almost not open in summer in the north, and the time can be appropriately extended. However, some air purifiers come with an automatic detection system that detects the use of the filter element and prompts whether it needs to be replaced. When the filter element needs to be replaced, there will be a light reminder. The air purifier also has an allergen filter that filters out pollen and animal hair or other allergens from the air. 

     The HEPA filter element in the air purifier filter element is the best filter material because of its large adsorption capacity and high purification efficiency. If it is used to filter cigarettes, the effect can reach 100%. It can be seen that the filter effect of this filter is not generally strong. It is recommended to replace it every 6 months to maintain air quality. In use, if the filter screen is full of dust, it should be replaced, so as to ensure that the filter screen of the air purifier can be in the best condition and ensure that the air is healthy and clean. Because once the filter is saturated, it will not absorb dust, and the air in the purifier can not only be purified, but also form secondary pollution due to the pollutants adsorbed on the filter.

     So how to judge if there is no automatic detection system function? 

     ①The purification effect is attenuated 

After the filter screen is saturated with air pollutants, the dust holding rate becomes lower and the purification efficiency decreases accordingly. If there is a haze meter at home, you can use the haze meter to verify the purification effect of the air purifier. If you find that the purification effect is greatly attenuated, then Don't hesitate to change the filter. 

     ②The air volume becomes smaller

     With the increase in the number of particles absorbed by the filter, a large amount of particles will also block the air outlet, and the filter will become more and more "tight and airtight", so the air volume at the air outlet of the air purifier will naturally decrease. When we feel that the air volume of the air outlet is significantly smaller, it means that the filter is about to be scrapped. 

     ③ Increased noise 

     Air purifier noise is an unavoidable problem, but if you find that your home air purifier tends to get louder, it's likely that the filter is too dirty. When the filter screen condenses a large amount of particulate matter, the resistance will naturally become larger. When the fan is running, the wind passing through the filter screen will generate higher decibel noise.