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CS Ultra HEPA + Active Carbon

Advanced 3-stage design. Delivers high-efficiency air purification.

$54.99 $59.99
CPAP filter upgrade HEPA + activated carbon
CPAP Model Options:

The Most Effective CPAP Air Filter Ever Made.

90 Days of Trusted Protection with Each Filter. Advanced 3-stage design. Delivers high-efficiency air purification.

CPAP filter upgrade HEPA + activated carbon

Advanced Multi-stage Filtration System.

Designed to support cleaner CPAP airflow with an advanced multi-stage filtration system. At its core is a true H13 HEPA filter, engineered to capture a high percentage of fine airborne particles like dust and pollen, paired with an activated carbon layer to help reduce odors.

Unlike standard flat filters, the ULTRA HEPA uses a pleated, high-surface-area design, allowing for efficient airflow while maintaining strong filtration performance. The result is consistent airflow without added restriction.

Key Features:

• Three-Stage Filtration System – an H13 HEPA core, Activated carbon , and HEPA fiber post-filter.

• High-Efficiency H13 HEPA Core Captures up to 99.95% of particles as small as 0.3 microns: dust, pollen, and other airborne particles.

• Activated Carbon Layer – Helps neutralize odors and trap larger particles extending filter life.

• Simple Replacement – Installs in seconds with no tools required. Designed to fit seamlessly with your CPAP.

BREATHE CLEAN, WHEREVER YOU GO

When you travel, you never know what the air quality will be like in hotels or rentals.

Upgrade your AirMini with a high-performance filter designed for travel. The CS Ultra AirMini Filter helps support cleaner airflow on the road.

• Engineered for travel: Precision fit for the ResMed AirMini, the world’s most popular travel CPAP.

• Advanced HEPA + activated carbon filtration: Capture airborne particles like dust and pollen; Reducing odors and common air contaminants.

HEPA 4-pack filter refill for CS Ultra Resmed CPAP

What the Data Shows

The testing shows that the CS Ultra™ HEPA + Activated Carbon Filter adds a much higher level of air filtration while still allowing the CPAP machine to breathe normally.

In simple terms, the filter is doing two important things at the same time:

1. It captures much smaller airborne particles.

The CS Ultra™ uses H13-grade HEPA filter media, rated to capture at least 99.95% of particles at 0.1–0.3 microns, which are extremely small particles. This is a major upgrade compared with a basic foam or mesh-style CPAP intake filter.

2. It does not meaningfully restrict airflow in testing.

The CS Ultra™ was tested on a ResMed AirSense 11 and compared with and without the filter installed. The test showed identical airflow patterns with no detectable pressure buildup or disruption during the tested baseline airflow condition.

That is what makes the CS Ultra™ such a strong upgrade: it improves filtration without creating the kind of airflow restriction users would worry about.

Test Conditions

• Machine: ResMed AirSense 11

• Sampling rate: 100 Hz

• Test Phases:

 1. No filter, mask off

 2. No filter, mask on

 3. With CS Ultra HEPA filter, mask off

 4. With CS Ultra HEPA filter, mask on

1. No Filter – Mask Off

• Free, unrestricted airflow

• Slight fan flow from the machine

• No added resistance

2. No Filter – Mask On

• Natural breathing cycles observed

• Inhalation and exhalation were strong and smooth

• Flow ranged from +40 slm to -100 slm

3. With CS Ultra Filter – Mask Off

• Airflow nearly identical to no-filter condition

• No meaningful pressure drop

• Excellent passive breathability

HEPA 4-pack filter refill for CS Ultra Resmed CPAP

This test compares airflow on a ResMed AirSense 11 with the standard setup and with the CS Ultra™ HEPA Filter installed.

The key takeaway is how closely the airflow lines match. During the mask-on portion of the test, the CS Ultra™ airflow line follows the no-filter line so closely that the colors overlap and blend together, making much of the graph look like one single line.

That is a strong result because it shows the CPAP maintained its normal airflow pattern with the CS Ultra™ installed. In this test, the CS Ultra™ added advanced external filtration without creating a meaningful airflow restriction.

Compared with a basic OEM-style intake filter, the CS Ultra™ is designed to provide a major filtration upgrade with H13 HEPA media and activated carbon, while still allowing the CPAP to breathe normally.

Cleaner intake air. Normal airflow performance. A smarter upgrade for your CPAP.

✅ CSpring ULTRA: H13 HEPA + Carbon

❌ ResMed OEM: Basic (non-HEPA)

✅ CSpring ULTRA: 99.95% or higher at particles 0.3 μm and above

❌ ResMed OEM: Approximately 60–80% at particles ≥5 μm


✅ CSpring ULTRA: 2 mm active carbon layer
❌ ResMed OEM: No

✅ CSpring ULTRA: About 64.8 cm² (pleated)

❌ ResMed OEM: About 13 cm² (flat)

✅ CSpring ULTRA: User-level air purification

❌ ResMed OEM: Basic device protection



✅ CSpring ULTRA: 3 layers

❌ ResMed OEM: 1 to 2 layers

Filter Type: External CPAP intake filter upgrade

Filtration Media: H13 HEPA media with activated carbon layer

Dimensions: 45 mm × 15 mm × 18 mm

Pleated Design: 4 pleats / 6 folds along the 15 mm side

HEPA Surface Area: Approximately 64.8 cm² of pleated filter media

Airflow Support: Designed to support airflow up to 100 L/min

Airflow Performance: Designed to provide high-efficiency filtration while maintaining normal CPAP airflow performance

Dust Holding Capacity: Extended dust-holding capacity due to the larger pleated media surface area

Odor Support: Activated carbon layer helps reduce unwanted odors from intake air

Compatibility: ResMed AirSense 10, AirCurve 10, AirSense 11, and AirCurve 11

Use: Replaces the standard OEM intake filter with an upgraded external HEPA + carbon filtration system

Replacement: Replace as needed, or more often in dusty environments

Important Note: The CS Ultra™ is designed to filter incoming air before it enters the CPAP device. It does not replace normal CPAP cleaning or maintenance.

What does the CS Ultra™ do?

The CS Ultra™ upgrades your CPAP’s standard intake filter with a larger external HEPA + activated carbon filter. It is designed to help filter incoming air before it enters your CPAP machine.

How is this different from the OEM filter?

Most OEM CPAP filters are small basic intake filters. The CS Ultra™ uses a larger pleated filter design with approximately 64.8 cm² of HEPA media surface area, plus activated carbon to help reduce odors.

Will the CS Ultra™ restrict airflow?

The CS Ultra™ is designed to support airflow up to 100 L/min. In testing on a ResMed AirSense 11, airflow with the CS Ultra™ closely matched airflow without the filter installed, showing no meaningful airflow restriction in that test.

What machines is it compatible with?

The CS Ultra™ is compatible with:

ResMed AirSense 10

ResMed AirCurve 10

ResMed AirSense 11

ResMed AirCurve 11

Does it replace the original CPAP filter?

Yes. The CS Ultra™ is designed as an upgraded external intake filter system for compatible ResMed AirSense and AirCurve machines.

What type of filter does it use?

The CS Ultra™ uses H13 HEPA filter media with an activated carbon layer. The HEPA media helps capture fine particles, while the activated carbon layer helps reduce unwanted odors from intake air.

How often should I replace the filter?

Replace the CS Ultra™ filter as needed, or sooner if it looks dirty, airflow seems reduced, or you are using it in a dusty environment. For many users, replacement every 1–3 months is a good general guideline.

Is it reusable or washable?

No. The CS Ultra™ filter is not washable. Replace the filter when needed. Washing the filter can damage the HEPA media and reduce performance.

Does it clean the air I breathe?

The CS Ultra™ helps filter the air entering your CPAP machine before it reaches your breathing circuit. It is not a medical treatment device and does not replace regular CPAP cleaning, maintenance, or your CPAP manufacturer’s instructions.

Does it help with odors?

Yes. The activated carbon layer is included to help reduce unwanted odors from intake air.

Is it easy to install?

Yes. The CS Ultra™ is designed for simple installation on compatible ResMed AirSense and AirCurve machines. Make sure it is properly seated before use.