HEPA filters are some of the best air filters on the market, usually found in many different air purifiers. They can be relatively expensive, but that just proves that they work. Cheaper HEPA filters might not be true HEPA filters, so keep your eyes peeled for those that might falsely claim that they’re true HEPA filters.
HEPA means high-efficiency particulate air, which means that it takes particles out of the air. They do this because of the interwoven material having multiple types of technologies, making it difficult for allergens, bacteria, and viruses to be kept inside of the weaves. However, that doesn’t mean that it can be left alone.
According to Damage Control 911, you have to keep the HEPA filter clean. You should vacuum or wipe down your HEPA filter about every two or so months. You should never let your HEPA filter go without a cleaning for more than three months.
Otherwise, you could see things growing that you don’t want to be there. At that point, you could see your air quality degrade more than it had before. This goes for any air filter, though. If it is a permanent HEPA air filter, you still need to clean it every other month to keep it running at its full potential.