Why is the formaldehyde filter not working effectively?

The formaldehyde filter uses catalytic activated carbon, which is highly effective at adsorbing and reacting with formaldehyde. It purifies indoor air by repeatedly filtering it through the purifier, thereby adsorbing formaldehyde and achieving a purification effect.
However, formaldehyde is a volatile organic compound that is not released all at once but rather gradually over time, sometimes for years. When indoor temperatures exceed 19°C (66°F), formaldehyde volatilizes more quickly, and the release rate increases with higher temperatures.
If there is an excessive amount of building materials in your home, the formaldehyde concentration can be very high. Additionally, if the release rate of formaldehyde exceeds the purifier's capacity to remove it, the purification effect can be less noticeable.
Furthermore, if you notice an increase in formaldehyde concentration, it could be due to varying release rates in different areas of the room. It is recommended to ventilate the room during the day when outdoor pollution levels are low.