If you rely on a CPAP machine for restful sleep, you might wonder what kind of water is best to use—especially when distilled water isn’t available. Can purified water do the job, or will it harm your machine or health?
This is an important question for both your comfort and the longevity of your equipment. In this article, we’ll clear up the confusion, explain the differences, and offer practical tips to keep your CPAP routine safe and simple.
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Can You Use Purified Water in Your CPAP Machine?
If you use a CPAP machine for sleep apnea, you know that the type of water you pour into its humidifier matters. But with so many choices—distilled, purified, bottled, or even tap water—it’s normal to feel confused. One of the most common questions is: Can you use purified water in your CPAP machine?
Let’s break down the facts, highlight the best practices, and give you clear advice to keep both your CPAP machine and your health in great shape.
The Clear Answer
In short: Yes, you can use purified water in your CPAP machine—but distilled water is recommended as the best and safest choice.
Let’s look at why that is, and what happens if you opt for purified water instead.
Distilled Water vs. Purified Water: What’s the Difference?
Understanding the difference between distilled and purified water is crucial when caring for your CPAP machine.
- Distilled Water is water that has been boiled into steam, then condensed back into liquid. This process removes minerals, bacteria, and most contaminants, making it the purest option.
- Purified Water goes through filtration methods like reverse osmosis, deionization, or carbon filtering. These methods remove many impurities and chemicals but may still leave behind some minerals.
Why Distilled Water Is Preferred
- It’s free of minerals and chemicals.
- It prevents mineral buildup inside your CPAP humidifier, extending the life of the machine.
- It minimizes the risk of inhaling unwanted particles, which is better for your respiratory health.
What Happens If You Use Purified Water?
If distilled water isn’t available, purified water is generally safe to use for short periods. Here’s what you should know:
- Most purified water is much cleaner than tap water.
- Some minerals may still remain, which can, over time, cause buildup in the reservoir.
- Occasional use isn’t likely to damage your CPAP, but regular use means you’ll have to clean your machine a bit more often.
Why Not Just Use Tap Water?
You might be tempted to use tap water in a pinch. Here’s why that’s not recommended:
- Tap water contains minerals, microbes, and sometimes chemicals.
- These can lead to scale (hard, crusty buildup) in your CPAP humidifier.
- Over time, microorganisms could grow inside the machine, increasing risks of respiratory issues.
- Tap water makes cleaning and maintenance much harder.
Types of Water and Their Effects on CPAP Machines
Let’s quickly run through your options and what to expect:
| Type of Water | Safety for CPAP | Pros | Cons |
|---|---|---|---|
| Distilled | Best choice | No minerals or impurities | Sometimes harder to find |
| Purified | Acceptable if needed | Most impurities removed | May still contain minerals |
| Bottled spring | Not recommended | Readily available | Contains minerals |
| Tap | Not recommended | Accessible | Minerals, chemicals, germs |
Benefits of Using Distilled (or Purified) Water
- Protects Your CPAP Machine
- Prevents mineral scale buildup.
- Helps parts last longer, saving on repair or replacements.
- Supports Your Health
- Reduces risk of respiratory irritation.
- Lowers the chance of infection from microbes.
- Improves Your Sleep
- Cleaner mist means better sleep quality and comfort.
- Fewer “off” tastes or smells coming from the humidifier.
Downsides of Using Purified Water Instead of Distilled
- Mineral Build-Up: Any remaining minerals can leave a residue. Over time, this buildup makes your humidifier harder to clean and could damage it.
- Possible Respiratory Risks: Extremely sensitive users may notice minor irritation, depending on what remains in the purified water.
- More Frequent Maintenance: If you often use purified water, schedule extra cleaning sessions for your CPAP parts.
Choosing and Storing Water for Your CPAP: Practical Tips
1. Aim for Distilled Water First
Whenever possible, use distilled water—it’s by far the safest bet.
2. If Distilled Isn’t Available, Choose Purified Water Wisely
- Check the label for words like “reverse osmosis” or “deionized.”
- Avoid water labeled “mineral,” “spring,” or “well.”
- If you’re unsure, it’s better to use purified water than tap, but keep it temporary.
3. Don’t Stockpile Large Quantities
- Even distilled or purified water can grow bacteria if left open too long.
- Buy small containers and keep them sealed.
4. Clean Your Machine Regularly
- Clean the water reservoir daily, especially if you use anything besides distilled water.
- Wash parts with mild soap and air-dry thoroughly.
5. Never Add Anything Extra
- Don’t add essential oils, scented products, or chemicals to the water. Only use water.
Step-by-Step Guide: Using Water in Your CPAP Machine
- Check Water Type: Look for distilled first. If not available, purified water is your next option.
- Pour Fresh Water Each Night: Empty and refill your reservoir daily.
- Use the Correct Amount: Don’t overfill your machine’s reservoir.
- Store Remaining Water Safely: If you have leftover distilled or purified water, keep it sealed in a cool place.
- Clean Regularly: At minimum, clean the water reservoir every morning.
When You Might Have to Use Purified Water
Life happens. Sometimes, you’re on vacation, traveling, or just can’t get distilled water at night. In those moments:
- Don’t skip humidification entirely. Using purified water is safer and preferable, especially if you have dry airways.
- Make up for it by cleaning thoroughly the next day, and switching back to distilled water as soon as possible.
- Avoid using tap or bottled mineral water if you have other options.
CPAP Humidifier Maintenance: Extra Tips
- Inspect Regularly: Look for any white or cloudy deposits in the water chamber, which signal mineral buildup.
- Replace as Needed: Replace your water chamber every 6 months or as soon as it shows signs of wear.
- Leave It Dry: When not in use, let your reservoir air dry completely to keep bacteria away.
Frequently Asked Questions (FAQs)
Can I use purified water in my CPAP machine every night?
You can use purified water occasionally if distilled isn’t available, but regular use isn’t recommended. Distilled water offers the best long-term protection for your device and health.
What’s the risk of using tap water in my CPAP machine?
Tap water contains minerals and sometimes bacteria or chemicals. These can form deposits inside your machine or cause health concerns if inhaled. It’s best to avoid using tap water for your CPAP.
Should I clean my CPAP humidifier more often if I use purified water?
Yes. If you use purified water regularly or for an extended period, it’s smart to clean your chamber more often—ideally every day, or after each use.
Can I use bottled water or spring water if nothing else is available?
Bottled or spring water often contains extra minerals that can build up inside your machine, just like tap water. As a rare emergency backup, it’s okay, but try to use distilled or purified water as soon as possible, and clean thoroughly after.
What should I do if I accidentally used the wrong type of water?
Don’t panic. Just empty the reservoir, clean it thoroughly with mild soap and water, and refill with distilled water as soon as possible. Occasional use of the wrong water type is not likely to damage your device, but make sure it doesn’t become a habit.
Final Thoughts
While distilled water is always the best choice for your CPAP machine, purified water is a suitable backup—especially in a pinch. Just remember, using purified water can mean more frequent cleaning and a bit of extra attention to maintenance. Your health and device longevity depend on keeping your CPAP system as clean and mineral-free as possible.
Regularly cleaning your humidifier, using the safest water available, and never adding anything but water ensures your sleep therapy is trouble-free and comfortable. Sleep well—and breathe easy!