How Often to Change CPAP Filters: The 2026 Maintenance Guide
What is a CPAP filter?
CPAP filters help keep the air you breathe through your CPAP machine clean. The filter also help maintain the long-term performance of your machine by filtering out dirt and dust that can cause damage.
Types of CPAP Filters
There are two types of CPAP filters. Each type has its own purpose and must be maintained differently.
While many legacy CPAP machines used a two-part "black and white" filter system, many modern devices like the AirSense 11 now utilize a single high-efficiency disposable filter.
The black CPAP filter removes pollen and larger debris from the air before the air reaches the white CPAP filter. The reusable foam filter (often black) should be washed once per week and replaced every 3 to 6 months, or sooner if the material begins to perish.
The white filter removes the finer debris from the air before the air reaches the CPAP machine itself. The white CPAP filter is disposable and should be changed every two weeks.
The CPAP filter system is an important part of the CPAP machine. The filter system aids in improving the quality of air being delivered to the CPAP user. Poor air quality being pumped into the lungs can lead to other health problems.
We suggest you keep a calendar by your CPAP machine and mark the dates you need to clean or replace your CPAP filters. Remember, the white CPAP filters are disposable and should be replaced bi-weekly. The reusable foam filters are washable and should be washed each week and replaced every 3 to 6 months.
Following your CPAP filter replacement schedule can help you get the rest you need.
What Causes CPAP Filter to Turn Black?
If you never change your CPAP filter, the particles in the air will begin to accumulate on the filter, turning it black. Poor indoor air quality may also be affecting the filter, including airborne particles from cigarette smoke and candles.
How Often Do You Change Filter in CPAP Machine?
Check your user manual for your CPAP machine for specific information on filter replacement. Depending on how often the machine is used, filters generally should be replaced twice a month.
Where to Buy CPAP Filters?
You can purchase replacement filters for your CPAP machine at The CPAP Shop. Find filters for all major CPAP machines and different types of filters. If you have questions about filter replacement or purchase, speak to our knowledgeable staff. Call 866-414-9700 or email us at questions@thecpapshop.com.
This post was last reviewed and updated for accuracy on March 11, 2026.
This post was updated with the latest information in March 2026.
If you haven't looked at your CPAP filter in a month, go check it right now. Is it gray? Is there a layer of dust? In 2026, we’ve learned that a dirty filter is the #1 cause of premature motor failure. When the filter is clogged, the motor has to spin twice as hard to maintain your prescribed pressure, leading to overheating and that dreaded "whining" sound.
What is a CPAP Filter?
CPAP filters help keep the air you breathe through your CPAP machine clean. The filter also help maintain the long-term performance of your machine by filtering out dirt and dust that can cause damage.
Types of CPAP Filters
While every environment is different (pets and smokers require more frequent changes), here is the clinical standard for 2026:
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Disposable Fine/Ultra-Fine Filters: Replace every 2–4 weeks.
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The 2026 Rule: If you can see any discoloration, the electrostatic charge is already gone. Toss it. These are not washable.
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Reusable Foam (Pollen) Filters: Wash weekly, replace every 6 months.
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The 2026 Rule: These trap the "big stuff" like pet hair. In 2026, we recommend replacing these sooner if the foam begins to crumble or lose its "springiness."
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What Causes a CPAP Filter to Turn Black?
If you never change your CPAP filter, the particles in the air will begin to accumulate on the filter, turning it black. Poor indoor air quality may also be affecting the filter, including airborne particles from cigarette smoke and candles.
Pro Tip: The "Flashlight Test"
In 2026, don't rely on your app's "reminder" alone—those are just timers.
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The Test: Hold your filter up to a bright light or your phone's flashlight. If you can't see the light shining clearly through the fibers, or if there is a "mottled" gray pattern, your machine is struggling to breathe. Change it tonight.
Where to Buy CPAP Filters?
You can purchase replacement filters for your CPAP machine at The CPAP Shop. Find filters for all major CPAP machines and different types of filters. If you have questions about filter replacement or purchase, speak to our knowledgeable staff. Call 866-414-9700 or email us at questions@thecpapshop.com.
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Respironics Brand Ultra-fine Filters for DreamStation CPAP and BiPAP MachinesSpecial Price $6.99 Regular Price $8.99 -
Respironics Brand Foam Filters for DreamStation CPAP and BiPAP Machines2 ReviewsSpecial Price $3.99 Regular Price $6.95 -
