When to Change Your Air Purifier Filter

When to Change Your Air Purifier Filter: A Comprehensive Guide

Air purifiers play a crucial role in maintaining indoor air quality, ensuring you and your family breathe in clean, allergen-free air. To ensure the effectiveness of your air purifier, it's essential to know when to change air filters. Regular filter replacement guarantees optimal performance, trapping airborne particles effectively and preventing them from recirculating back into your living space. In this article, we'll delve into the topic of when to change air purifier filters, with a specific focus on popular models like the Dyson air purifier and HEPA filters.

When to Change Filter on Air Purifier? Understanding Air Purifier Filters First

Before discussing when to change air purifier filters, let's briefly understand the common types of air purifier filters available in the market:

When to Change Filter on Air Purifier

a) HEPA Filters: High-Efficiency Particulate Air (HEPA) filters are renowned for their ability to trap 99.97% of particles as small as 0.3 microns. These filters are highly effective against dust, pollen, pet dander, mold spores, and even some bacteria.

b) Activated Carbon Filters: Activated carbon filters are excellent at adsorbing odors, smoke, and harmful volatile organic compounds (VOCs). While they don't capture particles as effectively as HEPA filters, they are essential for improving overall air quality.

c) Pre-Filters: Pre-filters act as the first line of defense, capturing larger particles like dust and hair.

They protect the more delicate HEPA and activated carbon filters, extending their lifespan.

When Should You Change Your Air Filter? 4 Signs it's Time to Change Your Air Purifier Filter

How to know when to change air filter? There actually are 4 signs to notify when should you change your air filter:

a) Regular Maintenance Schedule: Different air purifiers have varying filter replacement schedules. It's essential to follow the manufacturer's guidelines and replace filters at the recommended intervals. Check the user manual or the manufacturer's website for specific information.

b) Decreased Airflow: If you notice that the airflow from your air purifier has decreased significantly, it might be a sign that the filter is clogged with particles. Reduced airflow indicates that the purifier is struggling to pull in air and may not be cleaning the air as effectively.

c) Odors and Allergies Return: When you start noticing unpleasant odors or experience allergy symptoms that had improved with the air purifier in operation, it's likely that the filters have lost their effectiveness. This is a clear indicator that it's time for a replacement.

d) Visible Dirt and Dust Buildup: Some air purifiers come with indicator lights that turn on when it's time to change the filter. If your purifier doesn't have this feature, regularly inspect the filters for visible dirt and dust accumulation. If they look dirty, it's time for a replacement.

Normally When to Change HEPA Filter Air Purifiers?

HEPA filters are a critical component in air purifiers, especially for individuals with allergies or asthma. To maintain their efficiency:

a) Standard HEPA Filters: Replace these filters every 12 to 18 months, depending on usage and the manufacturer's recommendations. Normally, there's notify light on an air purifier, the red light means can sometime be a sign to change the air pufieir filter, if you would like to know what else a red sign could mean, you can check on my blog: Why is my air purifier red? 

b) True HEPA Filters: These filters have a longer lifespan and generally require replacement every 3 to 5 years.

When to Change Your Air Purifier Filter

Other Tips and Considerations

a) Filter Quality: Always use genuine replacement filters to ensure the best performance and longevity of your air purifier.

b) Air Quality and Usage: If you live in an area with high pollution or have high indoor air pollution due to smoking or pets, you may need to replace filters more frequently.



Regularly changing your air purifier filter is vital to maintain clean and healthy indoor air. Knowing when to change air purifier filter can significantly impact the performance of your air purifier. Follow the recommendations, pay attention to any signs of reduced efficiency, and replace filters promptly to enjoy fresh, purified air for years to come. Get good quality of air purifier filters at Membrane Solutions air purifier.