CS ULTRA 4-Pack Refill | Premium HEPA + Carbon Filters (VP)

Cspring™ | SKU:

CS4PACK-1

CS ULTRA 4-Pack Refill | Premium HEPA + Carbon Filters (VP)

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Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.

CSpring ULTRA – 4-Pack Refill Bundle

High-Efficiency Triple-Layer Filters for ResMed AirSense 11

Keep your CPAP system performing at its best with the CSpring ULTRA 4-Pack Refill. Each replacement filter features our signature triple-layer design—a carbon pre-filter, H13 HEPA core, and final-stage non-woven filter—for enhanced air purification and extended filter life.

✅ Includes: 4× Triple-layer filters (Activated Carbon + HEPA + Non-woven HEPA Composite)
✅ Compatible with: ResMed AirSense / Aircurve 10 and 11 (via CSpring ULTRA adapter)
✅ Designed for: Up to 100 L/min airflow and user-level air purification
✅ Not just machine protection—air purification for you

Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.

Carbon Pre-Filter (2 mm): Captures coarse dust, hair, and neutralizes odors and VOCs.
H13 HEPA Filter Core: Traps ≥99.95% of particles ≥0.3 μm, including allergens, bacteria, and fine dust.
Non-woven HEPA Composite Fiber Post-Filter: Ensures final-stage of particulate filtration before entering CPAP.

Specifications:

Dimensions	45 mm × 15 mm × 18 mm
Pleats	4 pleats (6 folds along 15 mm side)
HEPA Surface Area	~64.8 cm² (pleated media)
Airflow Support	Up to 100 L/min
Dust Holding	Extended due to large surface area
Compatibility	ResMed AirSense / Aircurve 10 and 11

🔄 Compared to Standard ResMed Filter:

Feature	ResMed OEM Filter	CSSpring ULTRA Filter
Filtration Class	Basic (non-HEPA)	H13 HEPA + Carbon
Efficiency	~60–80% (≥5 μm)	≥99.95% @ 0.3 μm
Odor/VOC Removal	❌	✅ 2mm (activated carbon layer)
Surface Area	~13 cm² (flat)	~64.8 cm² (pleated)
Protection Level	Basic device protection	User-level air purification
Filter Layers	1–2	3 layers

Usage Notes:

Replace every 1–3 months, or sooner in dusty environments.
Designed as supplemental filtration. Not a medical replacement.
Not FDA-cleared; consult your physician before modifying CPAP equipment.

⚠️ Notice:
This product is not manufactured by or affiliated with ResMed. It is not FDA-cleared and is not intended to diagnose, treat, cure, or prevent any disease. Use only as a supplemental air filter for general comfort and cleanliness. Always consult your physician before modifying CPAP equipment or therapy.

Returns Policy

CPAP Supplies Guide

This 4-pack is filters only. If you do not have the CSpring ULTRA housing yet, get the CSpring ULTRA Filter Kit first, it includes the adapter.
Select the variant that matches your machine at checkout: AirSense/AirCurve 10/11, or AirMini.
Once the housing is installed, these filters fit the ResMed AirSense 11 and AirSense 10.
Also fits the AirCurve 10 VAuto and AirCurve 10/11 BiPAP models using the matching variant and housing.
For the ResMed AirMini travel machine, select the dedicated AirMini variant, a different physical filter from the AS/AC 10/11 unit.
Replace each filter about every 90 days. Four filters cover roughly a year of use.
In dusty environments, change filters more often to prevent airflow restriction.
Browse the full CPAP Filters collection or the AirSense 11 Filters collection for other filter options.
Learn more about filter care in our CPAP filter guide.
These filters are supplemental and not FDA-cleared. Consult your provider before changing your therapy setup.

Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.

CSpring ULTRA – 4-Pack Refill Bundle

High-Efficiency Triple-Layer Filters for ResMed AirSense 11

Keep your CPAP system performing at its best with the CSpring ULTRA 4-Pack Refill. Each replacement filter features our signature triple-layer design—a carbon pre-filter, H13 HEPA core, and final-stage non-woven filter—for enhanced air purification and extended filter life.

✅ Includes: 4× Triple-layer filters (Activated Carbon + HEPA + Non-woven HEPA Composite)
✅ Compatible with: ResMed AirSense / Aircurve 10 and 11 (via CSpring ULTRA adapter)
✅ Designed for: Up to 100 L/min airflow and user-level air purification
✅ Not just machine protection—air purification for you

Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.

Carbon Pre-Filter (2 mm): Captures coarse dust, hair, and neutralizes odors and VOCs.
H13 HEPA Filter Core: Traps ≥99.95% of particles ≥0.3 μm, including allergens, bacteria, and fine dust.
Non-woven HEPA Composite Fiber Post-Filter: Ensures final-stage of particulate filtration before entering CPAP.

Specifications:

Dimensions	45 mm × 15 mm × 18 mm
Pleats	4 pleats (6 folds along 15 mm side)
HEPA Surface Area	~64.8 cm² (pleated media)
Airflow Support	Up to 100 L/min
Dust Holding	Extended due to large surface area
Compatibility	ResMed AirSense / Aircurve 10 and 11

🔄 Compared to Standard ResMed Filter:

Feature	ResMed OEM Filter	CSSpring ULTRA Filter
Filtration Class	Basic (non-HEPA)	H13 HEPA + Carbon
Efficiency	~60–80% (≥5 μm)	≥99.95% @ 0.3 μm
Odor/VOC Removal	❌	✅ 2mm (activated carbon layer)
Surface Area	~13 cm² (flat)	~64.8 cm² (pleated)
Protection Level	Basic device protection	User-level air purification
Filter Layers	1–2	3 layers

Usage Notes:

Replace every 1–3 months, or sooner in dusty environments.
Designed as supplemental filtration. Not a medical replacement.
Not FDA-cleared; consult your physician before modifying CPAP equipment.

⚠️ Notice:
This product is not manufactured by or affiliated with ResMed. It is not FDA-cleared and is not intended to diagnose, treat, cure, or prevent any disease. Use only as a supplemental air filter for general comfort and cleanliness. Always consult your physician before modifying CPAP equipment or therapy.

See Product Details

CS ULTRA 4-Pack Refill | Premium HEPA + Carbon Filters (VP)

$25.99 $22.00 (15% off) SAVE $3.99

$22.00 $25.99 (15% off) SAVE $3.99

Product Features

Replacement Parts

Reviews

FAQs

Product Features

This pack includes four CS Ultra filters only, the CSpring ULTRA housing is not included. If you do not already own the housing, get the Filter Kit first, it comes with the adapter you need to mount these filters.

Each filter layers a carbon pre-filter, an H13 HEPA core, and a non-woven post-filter. The carbon layer neutralizes odors and catches coarse dust; the HEPA core captures at least 99.95% of particles at 0.3 micron, including allergens and fine dust.

Pick AirSense 11/AirCurve 11, AirSense 10/AirCurve 10, or AirMini at checkout to match your machine exactly. The AirMini filter is a distinct part built specifically for that travel machine, not interchangeable with the AirSense/AirCurve 10/11 filter.

Adapter Required, Sold in the Kit

These filters only fit inside the CSpring ULTRA housing. If you do not have it yet, order the Filter Kit, which includes the housing plus filters, so you can start filtering right away.

Captures Particles as Small as 0.3 Micron

The H13 HEPA core is rated to capture at least 99.95% of particles as small as 0.3 micron, including dust, pollen, mold spores, and many bacteria-carrying droplets.

Carbon Layer Cuts Odors and VOCs

A 2 mm activated carbon layer sits ahead of the HEPA core, absorbing odors and volatile organic compounds and catching larger particles like hair and coarse dust before the finer filtration stages.

More Surface Area, Longer Filter Life

Each filter uses a pleated design with about 64.8 cm² of surface area, several times more than a flat standard filter, so it holds more dust before airflow starts to drop.

No Meaningful Airflow Restriction

These filters support airflow up to 100 L/min. In a manufacturer airflow test on an AirSense 11, pressure readings stayed nearly identical with and without the filter, so auto-adjusting pressure is not affected.

Four Filters, About a Year of Use

Replace each filter about every 90 days, so a 4-pack covers roughly a year under normal conditions. Replace sooner if a filter looks discolored, smells musty, or your environment is dusty.

Quick Swap Once the Adapter Is In

Once the CSpring ULTRA housing is installed, swapping in a new filter takes seconds and needs no tools. Just remove the old filter and press the new one into place.

Aftermarket Filtration, Not FDA-Cleared

These are aftermarket CSpring filters, not genuine ResMed parts, and they are not FDA-cleared. They are designed as supplemental filtration and do not replace prescribed CPAP components or normal maintenance.

Rated 3.7 out of 5 based on 3 customer reviews.

Some reviews on this page were submitted by customers who received an incentive, such as a discount code, in exchange for their feedback.

FAQs

Yes. This 4-pack is filters only, the adapter is not included. If you do not already own the CSpring ULTRA housing, get the Filter Kit first, it includes the adapter.

Four CS Ultra filters. The CSpring ULTRA housing (adapter) is not included and must be purchased separately or as part of the Filter Kit.

It fits the ResMed AirSense 10/11 and AirCurve 10/11 series when used with the CSpring ULTRA housing, and a distinct AirMini variant covers the ResMed AirMini travel machine. Select the variant that matches your exact machine at checkout.

No. The AirMini variant is a different physical filter engineered specifically for the AirMini. It is not interchangeable with the AirSense/AirCurve 10/11 filter.

A carbon pre-filter neutralizes odors and VOCs, an H13 HEPA core captures fine particles, and a non-woven post-filter catches any remaining residue before air reaches the CPAP.

It captures at least 99.95% of particles as small as 0.3 micron, including dust, pollen, and mold spores.

No meaningful restriction. In a manufacturer airflow test on an AirSense 11, pressure readings were nearly identical with and without the filter installed, so auto-adjusting pressure is not affected.

About every 90 days. A 4-pack covers roughly a year of use under normal conditions, sooner if your environment is dusty.

No. These filters are disposable. Replace them rather than washing them.

No. It is an aftermarket filter made by CSpring, not a genuine ResMed part, and it is not FDA-cleared.

Device Type	Aftermarket CPAP replacement filter 4-pack (HEPA + activated carbon)
Filtration Stages	3-stage: activated carbon pre-filter, H13 HEPA core, non-woven post-filter
HEPA Efficiency	At least 99.95% of particles at 0.3 micron (H13 grade)
Carbon Layer	2 mm activated carbon
Filter Surface Area	About 64.8 cm² (pleated media)
Dimensions	45 mm x 15 mm x 18 mm
Pleats	4 pleats (6 folds along the 15 mm side)
Airflow Support	Up to 100 L/min, no meaningful restriction in manufacturer AirSense 11 airflow test
Replacement Cadence	About every 90 days per filter; a 4-pack covers roughly a year
Compatibility	ResMed AirSense 10/11 and AirCurve 10/11 (with the CSpring ULTRA housing), or a distinct AirMini/AirMini Pro variant; select the variant that matches your machine
What's Included	Four (4) CS Ultra filters; housing/adapter not included, requires the CSpring ULTRA housing
Regulatory Status	Not FDA-cleared; supplemental filtration, not a medical device

CS ULTRA 4-Pack Refill | Premium HEPA + Carbon Filters (VP)

Filter Options

Free Shipping Over $50

Unlimited Support

Price Match Guarantee

Overview

**Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.**

CSpring ULTRA – 4-Pack Refill Bundle

Specifications:

🔄 Compared to Standard ResMed Filter:

Usage Notes:

Guide and Resources

Important Tips

What’s Included

**Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.**

CSpring ULTRA – 4-Pack Refill Bundle

Specifications:

🔄 Compared to Standard ResMed Filter:

Usage Notes:

CS ULTRA 4-Pack Refill | Premium HEPA + Carbon Filters (VP)

Product Features

Four Filters, Adapter Required

What the Three-Stage Filter Removes

Choose the Right Variant for Your Machine

Adapter Required, Sold in the Kit

Captures Particles as Small as 0.3 Micron

Carbon Layer Cuts Odors and VOCs

More Surface Area, Longer Filter Life

No Meaningful Airflow Restriction

Four Filters, About a Year of Use

Quick Swap Once the Adapter Is In

Aftermarket Filtration, Not FDA-Cleared

FAQs

Do I need the CSpring ULTRA adapter for this refill?

What's included in this 4-pack?

Which machines does it fit?

Is the AirMini filter the same as the AirSense/AirCurve filter?

What does the three-stage filtration remove?

What does the H13 HEPA layer capture?

Will this restrict airflow or change my pressure settings?

How often should I replace each filter?

Are these filters washable?

Is this a genuine ResMed filter?

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Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.

Adapter not included. This refill pack is intended for use with the CSpring ULTRA housing system.