Why Filter Replacement Timing Matters
A clogged filter reduces air purifier effectiveness and can even release trapped particles back into the air. Most manufacturers recommend replacing HEPA filters every 6-12 months, but actual life depends on usage, air quality, and environmental factors.
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Signs Your Filter Needs Replacement
Reduced airflow
Air coming out feels weaker than usual
Increased noise
Fan works harder to push air through clogged filter
Visible dirt buildup
Filter looks gray or discolored when inspected
Odors returning
Smells that were eliminated start coming back
Allergy symptoms
Sneezing or irritation despite running purifier
How Filter Life is Estimated
We adjust the manufacturer's rated filter life based on your actual usage and environmental factors that affect how quickly the filter gets saturated.
Adjusted Life = Base Life × Usage Factor × Air Quality × Additional Factors
- 1 Start with manufacturer's rated filter life
- 2 Adjust for daily usage (24/7 uses filter faster than 8 hrs/day)
- 3 Factor in local air quality conditions
- 4 Apply additional factors like pets, smoking, or cooking
Extend Your Filter Life
Use a pre-filter to catch large particles before the HEPA
Vacuum the exterior and pre-filter monthly
Keep windows closed during high pollution days
Place purifier away from direct dust sources
Filter Replacement FAQ
Can I clean and reuse HEPA filters?
True HEPA filters cannot be washed - water damages the fibers. Some units have washable pre-filters, but the main HEPA filter must be replaced. 'Permanent' or 'washable' HEPA filters exist but are less effective.
Should I replace carbon and HEPA filters at the same time?
Not necessarily. Carbon filters for odors often need replacement every 3-6 months, while HEPA filters last 6-12 months. Check your specific model's recommendations.
Is it bad to run a purifier with an old filter?
Yes. A saturated filter restricts airflow, making the motor work harder and potentially releasing trapped particles. It's better to replace on schedule for both performance and longevity.