How often to change air purifier filter cartridges depends on the model, but most main filters are rated for 6 to 12 months, and pre-filters need cleaning far more often. Levoit, Coway and Winix all say to replace their main filters every 12 months, as reported by HouseFresh, an independent air purifier testing site.
Pets, smoke and wildfire season shorten that. JMG ENTERPRISES, a YouTube channel, replaces his Levoit filters every 4 to 6 months because he has a dog. Mold Mending, a channel on indoor air and mold, found a filter left 9 months was heavily clogged.
Your manual has the final word for your model.
How Often to Change Air Purifier Filter: Schedules by Model
Prices from Amazon at time of writing. I may earn a commission from links, at no cost to you.
| Purifier | Main filter | Pre-filter | Source |
|---|---|---|---|
| Levoit Vital 200S-P | Every 12 months ($49.99) | Washable; clean regularly | The YouTube channel HouseFresh |
| Coway Airmega Mighty2 (AP-1512N) | Every 12 months ($69.99) | Slide-out; vacuum every 2 to 4 weeks with pets | HouseFresh |
| Winix 5510 | Every 12 months ($79.99 kit) | Washable fine mesh | HouseFresh |
| Blueair Blue Pure 211i Max | Every 6 to 9 months (about $70) | Washable fabric | The YouTube channel Consumer Analysis |
Signs Your Filter Needs Changing Sooner
- The filter-life indicator hits zero. The Mighty2 shows exact remaining life for both filters.
- Odors come back faster. Carbon fills up before the particle filter, which is why bonded filters get replaced early.
- Pets, smoke, construction dust or wildfire season. Owners with dogs report replacing filters every 4 to 6 months.
- The pre-filter is caked with dust. Clean it right away, since a clogged pre-filter cuts airflow.
How to Change the Filter Safely
- Turn the purifier off and unplug it.
- Remove the pre-filter and clean or vacuum it, following your manual.
- Slide out the old main filter, bag it and tie it before carrying it to the trash, as the YouTube channel Mold Mending suggests.
- Install the new filter in the right direction and reset the filter indicator.
How These Picks Were Chosen
The picks and findings on this page come from Mold Mending, JMG ENTERPRISES, HouseFresh and Consumer Analysis, plus the Amazon listings linked above. I have not tested these products myself, so each finding is credited to the source that reported it.
What YouTube Creators Say About Filter Changes
These findings are paraphrased from the video transcripts and credited to each creator. They are the creators’ own test results and opinions, not mine.
- Mold Mending: filter packs often include two carbon pre-filters per HEPA filter because the carbon layer gets changed at about 3 months. She found 6 months plenty for the HEPA filter, and bags old filters before carrying them to the trash so dust is not released again.
- The YouTube channel JMG ENTERPRISES: he vacuums his Levoit HEPA filters and blows them out about every 10 days, and still replaces them every 4 to 6 months because he has a dog. Check your manual first, since some manufacturers say not to vacuum the main filter.
- HouseFresh praised the slide-out pre-filter, which it suggests vacuuming every 2 to 4 weeks, especially with pets.
- HouseFresh: the main filter is bonded, so you replace the whole thing once the carbon is used up. For odors, it suggests the Pet, Toxin or Smoke filters, which have 400 g of pelleted carbon versus 250 g in the original, but says that is still too little for serious odor or VOC problems.
- Consumer Analysis: downsides are the exposed fabric pre-filter, which shows debris and wear, a proprietary particle filter instead of true HEPA, a thin foam carbon layer, and filter costs of about $70 every 6 to 9 months, or about $93 a year.
Frequently Asked Questions
How often should you change an air purifier filter?
Most main filters are rated for 6 to 12 months. Coway, Levoit and Winix list 12 months for the models here; Blueair lists 6 to 9 months for the 211i Max.
Can you wash a HEPA filter?
Usually not. Pre-filters are often washable, but most manufacturers say not to wash the main filter. Check your manual.
How often should you change the filter with pets?
Often sooner. One Levoit owner with a dog replaces his filter every 4 to 6 months.
What happens if you don’t change the filter?
Airflow drops and odors come back as the carbon fills up. Mold Mending found a filter left 9 months was heavily clogged.
Sources
- Amazon “Customers say” review summaries on each listing (AI-generated by Amazon from customer reviews), from Amazon at time of writing
- Amazon product listings for the air purifiers linked above, from Amazon at time of writing
- Amazon search results for “air purifier” (snapshot October 16, 2026)
- Mold Mending: “How Often Should I Change Filters in my Air Purifier and How to Keep Track?”
- JMG ENTERPRISES: “How To Clean Air Purifier Filters (HEPA – Levoit)”
- HouseFresh: “Coway Mighty2 → The BEST Air Purifier for Most People?”
- HouseFresh: “Levoit Vital 200S ▸▸ Still Worth It In 2026?”
- Consumer Analysis: “Blue Pure 211i Max Review – The Best Value Large Air Purifier?”
Related: Best Air Purifier for Pets | Levoit Vital 200S-P Review | Air Purifier for Smoke
Notes and disclosure
Note: Prices and ratings come from Amazon listings at time of writing. Prices change often, so check the current listing. CADR and coverage figures are the manufacturers’ listed numbers unless a reviewer is credited. Test results quoted below come from the YouTube reviewers credited in each section.