This article is for general education. Always follow your CPAP manufacturer's specific cleaning instructions for your water chamber, including any guidance on dishwasher use, and check with your DME provider if you're unsure.
Key Takeaways
Empty and rinse the water chamber every morning, and let it air-dry fully before the next use.
Wash it thoroughly once a week with warm water and a gentle, CPAP-appropriate soap.
Use distilled water to prevent the mineral buildup that makes chambers cloudy and hard to clean.
For stubborn white scale, an occasional white-vinegar soak dissolves mineral deposits that soap alone won't lift.
Let the chamber dry completely between uses; a dry chamber is the simplest defense against buildup and odor.
The water chamber holds standing water in the warm part of your CPAP setup, which makes it one of the components that is worth keeping clean. When left unwashed, it can develop cloudiness, mineral scale, or a stale smell, none of which belong in a part connected to the air you breathe in all night.
The good news is that keeping it clean is simple and takes only a few minutes. This guide walks through the daily step, the weekly deep clean, how to remove stubborn mineral buildup, and how to dry and store the chamber properly, along with a few common questions.
1. How Often to Clean the Water Chamber
The routine can be broken up into three stages, and keeping them straight makes the process easy to stay on top of:
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Daily: Empty the chamber, rinse it, and let it air-dry.
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Weekly: Wash it thoroughly with warm water and a gentle, CPAP-appropriate soap.
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As needed: Descale with a vinegar soak when mineral buildup appears.
This lines up with the broader rhythm for the rest of your equipment. For the full picture of what to clean and when across your whole setup, see Your Daily, Weekly, and Monthly CPAP Cleaning Schedule. Manufacturer guidance can vary from one device to the next, so check your manual for anything specific to your chamber.
2. The Daily Step
Every morning, empty any water left in the chamber rather than leaving it to sit through the day. Give it a quick rinse with clean water, then leave it open to air-dry while you're out and about. This daily habit takes less than a minute and does most of the work of keeping the chamber fresh.
Refill the chamber with fresh distilled water at night, right before you use it, rather than filling it in the morning and letting it stand full all day. Standing warm water is where buildup and odor tend to start, so the less time the chamber spends sitting full, the better. Letting it dry out between uses is one of the simplest and most effective habits in the whole routine.
3. The Weekly Deep Clean, Step by Step
Once a week, give the chamber a more thorough wash. The whole process takes just a few minutes, and following the steps in order makes it easy to do well:
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Separate the chamber from the machine. Remove it from the humidifier unit, and if your chamber opens into two parts, separate them so you can reach every surface.
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Rinse out any residual water. Tip out anything left inside and give it a quick pre-rinse with clean water.
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Wash in warm water with a gentle soap. Use warm water and a small amount of a CPAP-appropriate soap like Liquid CPAP Soap. A dedicated wash basin makes this easier and keeps the chamber out of a potentially dirty sink.
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Reach the corners and seams. Pay attention to the corners and along any seams where residue tends to collect. Use gentle motion and a soft cloth; skip abrasive scrubbers, which can scratch the material and leave it harder to keep clean.
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Rinse thoroughly. Rinse with clean water until no soap remains, since leftover residue can carry into the airpath.
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Air-dry completely. Set the chamber on a clean towel or drying rack and let it dry fully before reassembling or refilling.
A short list of what to avoid keeps the chamber in good condition:
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No bleach or harsh dish detergents: These can degrade the chamber material over time and may leave residues behind.
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No abrasive scrubbers or scouring pads: They scratch the surface, which makes buildup cling more easily.
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Check the manual before any dishwasher use: Many chambers are not dishwasher-safe, and heat can warp them. Hand-washing is the safe default.
For more on why a CPAP-specific soap is worth using rather than whatever's by the sink, see Can You Use Household Soap to Clean Your CPAP?.
4. Removing Mineral Buildup (Descaling)
If you notice a chalky white film on the chamber walls, that's mineral scale, left behind by the minerals in tap or bottled water when the water evaporates. It's cosmetic and related to the material rather than being dangerous, but it's worth removing, since it clouds the chamber, clings to the surface, and shortens the chamber's usable life if it's left to accumulate.
A white-vinegar soak dissolves it. Mix equal parts white vinegar and water, enough to fill the chamber, and let it soak for around 20 to 30 minutes. The mild acidity breaks down the mineral deposits that soap alone won't lift. Afterward, wash the chamber as usual, rinse it thoroughly so no vinegar smell or residue remains, and air-dry it completely.
Use this as an occasional treatment when scale appears, not as part of the routine weekly wash. The best fix is prevention: Switching to distilled water stops most scale from forming in the first place, which is far easier than removing it later.
5. Drying and Storage
Drying is part of cleaning, and should not be treated as an afterthought. A chamber that's put away or refilled while still damp gives buildup and odor a place to start, which undoes the work of washing it. After each wash, set the chamber on a clean towel or drying rack and let it air-dry completely, away from exposure to direct sunlight, which can affect the material over time. Don't reassemble or refill it until it's completely dry.
If you're storing the chamber for travel or a stretch of time away from therapy, clean and fully dry it first, then store it somewhere clean and dry until it's needed again. A chamber put away clean and dry is ready to use whenever you are.
Frequently Asked Questions
How often should I clean my CPAP water chamber?
Empty and air-dry it daily, wash it thoroughly once a week, and descale it with a vinegar soak as needed when mineral buildup appears. Refill it with fresh distilled water each night rather than letting it stand full during the day.
Can I put my CPAP water chamber in the dishwasher?
Many chambers are not dishwasher-safe, and dishwasher heat can warp the material, so check your manual before trying it. Hand-washing with warm water and a gentle soap is the safe default.
What is the white residue in my water chamber?
That chalky white film is mineral scale, left behind by the minerals in tap or bottled water. An occasional white-vinegar soak removes it, and switching to distilled water prevents it from forming.
How do I get mold out of my CPAP water chamber?
Wash the chamber thoroughly with warm, soapy water, paying attention to the corners and seams. If it doesn't fully clean, or if the problem persists, replace the chamber. The best prevention is drying it completely between uses, since a dry chamber gives buildup nowhere to take hold.
Can I use soap and water on the chamber?
Yes, a gentle, CPAP-appropriate soap and warm water are exactly right. Avoid bleach, harsh dish detergents, and abrasive scrubbers, which can damage the chamber material.