Many customers who using air purifier filters may have the question about when the air purifier filter should be replaced, generally there are three methods we can choose to deal with the problem.
Suggestion 1: According to the color of the filter material
HEPA filter media have two sides, the side where the air flows in is called the front or windward side, and the side where the air flows out is called the leeward or back side. When the back side of the filter becomes dark gray or black, the filter needs to be replaced. Generally, the color of the filter material is white or white yellowish before use (some products add a layer of blue or silver antibacterial film on the front side of the filter, but the filter material itself is still white or slightly yellowish), with the continuous use of air purifiers, the color of the filter material gradually becomes darker, which is mainly due to the particles embedded in the filter material fibers. This is mainly due to the particles embedded in the fibers of the filter material. The location of the particles staying in the filter material will be different with different filtration levels. The higher the filtration level, the less likely the back of the filter to become black, the True H13 (filtration efficiency of 0.3 microns or more particles greater than or equal to 99.97%) filters, even if continuous use in 24 hours a day for 1-2 years, the back of the filter is as white as new while the front will become very black.
Suggestion 2: According to the odor emitted by the filter
Generally the air purifier not only remove PM2.5, but also able to deal with formaldehyde, toluene, TVOC, ammonia, hydrogen sulfide, sulfur dioxide and other odors. And activated carbon or deodorization unit with activated carbon as a carrier is a safer and more effective solution to remove harmful gases. However, activated carbon will be saturated after a period of time, when its ability to deal with harmful gases is greatly reduced, and even the gas adsorbed in the past will escape. At that time the air purification will be likely to emit unpleasant odors, which means the filter need to be replaced.
Suggestion 3: According to PM2.5
If you have a PM2.5 detector, then you can compare the removal rate of the machine in the new opened state and used for a period of time, when the removal rate drops 50% you can replace the filter. This standard is only applicable to HEPA filters.
Post time: Apr-12-2022