How to Change Xiaomi Air Purifier Filter in 2026 A Quick Guide

Replacing your Xiaomi air purifier filter in 2026 is quick and essential for optimal air quality. Simply open the front panel, remove the old filter, insert the new one, and reset the filter life indicator via the Mi Home app. Regular filter changes ensure maximum efficiency, longer device life, and cleaner air in your home.

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Key Takeaways

• Power off first: Always unplug the purifier before replacing the filter for safety.
• Check filter model: Match the new filter to your Xiaomi air purifier’s model number.
• Open back panel: Press the release button to access the filter compartment easily.
• Dispose responsibly: Wrap the old filter in plastic before binning to trap contaminants.
• Reset filter timer: Hold the reset button for 3 seconds after installation.
• Clean surroundings: Wipe the purifier’s interior to remove dust before inserting the new filter.
• Buy OEM filters: Use genuine Xiaomi filters for optimal performance and longevity.

How to Change Xiaomi Air Purifier Filter in 2026: A Quick Guide

Imagine this: you’ve been relying on your Xiaomi air purifier for months—maybe even years—to keep your home smelling fresh and your air clean. It hums quietly in the corner, doing its job without complaint. But lately, you’ve noticed it’s working harder than usual. The fan is louder, the air doesn’t feel as crisp, and that “Filter Life” notification on the app has been blinking for weeks. Sound familiar?

Don’t worry—you’re not alone. Many Xiaomi air purifier owners don’t realize that filters aren’t meant to last forever. In fact, most need replacing every 6 to 12 months, depending on usage and air quality. The good news? Changing the filter is one of the easiest maintenance tasks you’ll ever do. No tools, no technical skills, and definitely no need to call a technician. In this guide, I’ll walk you through every step of changing your Xiaomi air purifier filter in 2026—whether you own the Mi Air Purifier 3H, the Pro H, or the newer Smart Air Purifier 4. By the end, you’ll feel confident, informed, and ready to breathe easier.

Why Changing Your Xiaomi Air Purifier Filter Matters

Let’s start with the “why.” Why should you even bother changing the filter? After all, your purifier still turns on, right? Well, think of the filter like the lungs of your device. Over time, it collects dust, pollen, pet dander, smoke particles, and even bacteria. As it gets clogged, it can’t do its job efficiently. This doesn’t just mean less clean air—it can also strain the motor, increase energy use, and shorten the lifespan of your purifier.

The Hidden Costs of a Dirty Filter

I learned this the hard way. Last winter, I ignored the filter warning on my Mi Air Purifier 3H for nearly four months. I figured, “It’s still running, so what’s the harm?” But then I started waking up with a stuffy nose and noticed more dust on my furniture. When I finally checked the filter, it was dark gray and packed with gunk. Replacing it made an instant difference—my allergies improved, and the purifier ran quieter. That’s when I realized: a clean filter isn’t just about performance. It’s about your health.

Here’s what happens when you delay a filter change:

• Reduced airflow: A clogged filter restricts air movement, so your purifier has to work harder to circulate air.
• Poor air quality: The filter can’t trap new pollutants effectively, so you’re breathing in more allergens and irritants.
• Increased energy bills: The motor runs longer and uses more power to push air through a dirty filter.
• Potential damage: Over time, strain on the motor can lead to overheating or failure.

How Often Should You Change the Filter?

Xiaomi recommends replacing the filter every 6 to 12 months, but this isn’t a one-size-fits-all rule. Your environment plays a big role. If you live in a city with high pollution, have pets, or suffer from allergies, you may need to change it every 4 to 6 months. On the other hand, if you use the purifier occasionally in a clean, rural area, it might last closer to a year.

The best way to know? Use the Mi Home app. It tracks filter usage based on runtime and air quality, giving you a percentage estimate of remaining life. When it drops below 10%, it’s time to act. Don’t wait for it to hit zero—by then, the filter is already compromised.

How to Identify When Your Xiaomi Air Purifier Filter Needs Replacing

Even if the app says your filter is at 15%, you might still wonder: “Is it really time?” Here are some telltale signs that your filter is due for a change—no app needed.

Visual Inspection: What to Look For

The most obvious clue is the color of the filter. A new Xiaomi filter is bright white or light gray. After a few months of use, it darkens as it captures pollutants. If your filter looks brown, black, or heavily discolored, it’s definitely time for a replacement. Don’t just look at the surface—check the inner layers too. If they’re packed with debris, airflow is being blocked.

Another sign? Odor. If your purifier starts emitting a musty or stale smell, even when clean, the filter may be harboring mold or bacteria. This is especially common in humid climates or if the purifier was left off for long periods.

Performance Issues to Watch For

Pay attention to how your purifier behaves. If you notice any of the following, it could be filter-related:

• The fan runs at high speed constantly, even in auto mode.
• Airflow feels weaker than usual, even on the highest setting.
• The air quality sensor shows poor readings indoors, despite no obvious sources of pollution.
• You or your family members experience more allergy symptoms, like sneezing or congestion.

One user I spoke with, Sarah from Melbourne, said her purifier started making a grinding noise. She assumed it was a motor issue and nearly bought a new unit. But after checking the filter, she found it completely clogged with pet hair. A $30 replacement filter solved the problem instantly.

Using the Mi Home App for Accurate Monitoring

The Mi Home app is your best friend when it comes to filter maintenance. It not only tracks usage but also sends push notifications when it’s time to replace the filter. You can also manually check the filter life by opening the app, selecting your purifier, and tapping on “Filter Life.”

Pro tip: Enable notifications in the app settings so you never miss a reminder. You can also set up recurring calendar alerts as a backup. I do this every 6 months—just in case the app glitches or I’m traveling.

Step-by-Step Guide to Changing Your Xiaomi Air Purifier Filter

Now for the main event: actually changing the filter. Don’t worry—it’s simpler than changing a lightbulb. I’ve done this on three different Xiaomi models, and the process is nearly identical. Here’s how to do it safely and correctly.

Step 1: Turn Off and Unplug the Purifier

Safety first. Always turn off the purifier using the power button, then unplug it from the wall. This prevents accidental startup and protects you from electrical hazards. Even though the purifier is low voltage, it’s better to be safe than sorry.

I made the mistake of changing a filter while the unit was in standby mode once. The fan kicked on unexpectedly, and I nearly dropped the new filter. Lesson learned: unplug it every time.

Step 2: Open the Front Panel

Most Xiaomi purifiers have a front panel that snaps open. On the Mi Air Purifier 3H and Pro H, you’ll find a small indentation at the bottom. Gently press and pull the panel outward. It should release with a soft click. On the newer Smart Air Purifier 4, the panel is magnetic and lifts off easily.

If it feels stuck, don’t force it. Check for hidden latches or screws. Some older models may have a small screw near the hinge—use a Phillips head screwdriver to remove it first.

Step 3: Remove the Old Filter

Once the panel is open, you’ll see the filter housed in a plastic frame. Gently pull the frame straight out. The filter itself is usually held in place by clips or a Velcro strip. Carefully remove the old filter and set it aside.

Tip: Take a photo of how the filter is positioned before removing it. This helps when installing the new one, especially if you’re dealing with a multi-layer filter like the HEPA + activated carbon combo.

Step 4: Clean the Interior (Optional but Recommended)

While the filter is out, take a moment to wipe down the inside of the purifier. Use a dry or slightly damp microfiber cloth to remove dust from the fan blades, sensors, and housing. Avoid using water or cleaning sprays near electrical components.

I like to use a small handheld vacuum with a brush attachment to suck up loose debris. This prevents it from getting sucked back into the new filter.

Step 5: Install the New Filter

Take your new Xiaomi filter out of the packaging. Remove any plastic wrap or protective film. Make sure the airflow arrow on the filter matches the direction indicated inside the purifier (usually pointing inward).

Slide the new filter into the frame, securing it with clips or Velcro. Then, reinsert the frame into the purifier, pushing it in until it clicks into place. Close the front panel firmly—you should hear it snap shut.

Step 6: Reset the Filter Life in the App

This step is crucial. Even with a new filter, the app will still show the old usage percentage. To reset it:

1. Open the Mi Home app.
2. Select your air purifier.
3. Tap on “Filter Life.”
4. Choose “Reset Filter Life” or “Replace Filter.”

The app will reset the counter to 100%, and you’ll start fresh. Some models also allow you to scan a QR code on the new filter for automatic recognition—super convenient!

Choosing the Right Replacement Filter for Your Xiaomi Air Purifier

Not all filters are created equal. Using the wrong one can reduce performance or even damage your purifier. Here’s how to pick the right replacement.

Original vs. Third-Party Filters: What’s the Difference?

Xiaomi sells official replacement filters, but you’ll also find cheaper third-party options on Amazon, AliExpress, and other retailers. So, which should you choose?

Original Xiaomi filters are designed specifically for your model. They meet strict quality standards for filtration efficiency, airflow, and fit. They also come with a QR code for easy app recognition. The downside? They’re more expensive—usually $30 to $50.

Third-party filters can be tempting because they’re often half the price. But quality varies widely. Some are decent, while others use inferior materials that don’t filter as effectively or may even release particles back into the air. I’ve tried a few, and while some worked fine, one actually made my allergies worse.

My advice? Stick with original filters if you can afford them. If you’re on a budget, look for reputable third-party brands with good reviews and certifications (like HEPA H13 or activated carbon ratings). Avoid no-name sellers with no product images or customer feedback.

Understanding Filter Types and Features

Xiaomi offers different filter types depending on your model and needs:

• Standard HEPA Filter: Captures 99.97% of particles as small as 0.3 microns. Great for dust, pollen, and pet dander.
• HEPA + Activated Carbon Filter: Adds odor and gas filtration. Ideal for smokers or homes with cooking smells.
• Antibacterial Filter: Includes a silver ion coating to inhibit bacterial growth. Useful in humid environments.
• High-Efficiency Filter (for Pro models): Designed for larger rooms and higher pollution levels.

Check your purifier’s manual or the Mi Home app to see which filter is recommended. Using the wrong type can void your warranty or reduce performance.

Where to Buy Genuine Xiaomi Filters

To avoid counterfeit products, buy directly from trusted sources:

• Official Xiaomi website or Mi Store
• Authorized retailers like Amazon (sold by Xiaomi or verified sellers)
• Local electronics stores that carry Xiaomi products

Avoid marketplaces with unverified sellers or prices that seem too good to be true. A genuine filter should come in sealed packaging with a QR code and model number.

Tips for Maintaining Your Xiaomi Air Purifier Between Filter Changes

Changing the filter is important, but regular maintenance keeps your purifier running smoothly between replacements. Here are some simple habits that make a big difference.

Clean the Exterior and Sensors Weekly

Dust builds up on the exterior and can interfere with the air quality sensor. Wipe the surface with a soft, dry cloth weekly. For the sensor (usually a small window on the front or side), use a cotton swab lightly dampened with water. Avoid alcohol or harsh cleaners—they can damage the coating.

I clean my purifier every Sunday while doing my regular house cleaning. It takes less than two minutes and keeps everything accurate.

Keep the Area Around the Purifier Clear

Your purifier needs space to draw in air. Keep at least 12 inches of clearance on all sides. Don’t place it behind furniture, curtains, or in a corner where airflow is restricted. This ensures maximum efficiency and prevents overheating.

One user placed her purifier under a shelf, thinking it would be out of the way. Within a month, the filter was clogged because air couldn’t circulate properly. Moving it to an open spot solved the issue.

Use Auto Mode for Optimal Performance

The auto mode uses the built-in sensor to adjust fan speed based on real-time air quality. This not only keeps your air cleaner but also extends filter life by avoiding unnecessary high-speed operation.

I used to run my purifier on high 24/7, thinking it was better. But the filter wore out in just four months. Switching to auto mode doubled its lifespan.

Monitor Air Quality Trends

Use the Mi Home app to track air quality over time. If you notice frequent spikes in pollution, consider using the purifier more often or upgrading to a higher-capacity model. You can also identify pollution sources—like cooking or opening windows on high-pollution days—and adjust your habits.

Common Mistakes to Avoid When Changing Your Filter

Even simple tasks can go wrong if you’re not careful. Here are some common pitfalls and how to avoid them.

Forgetting to Reset the Filter Life

This is the #1 mistake I see. You install a new filter, but the app still shows 5% life. Without resetting, you won’t get accurate reminders, and the purifier may not perform optimally. Always reset the filter life in the app after replacement.

Installing the Filter Backward

Filters have a specific airflow direction. Installing them backward reduces efficiency and can damage the motor. Look for the arrow on the filter frame and match it to the direction indicated inside the purifier.

Using Damaged or Expired Filters

Check the packaging for an expiration date. Filters can degrade over time, even when unused. Also, inspect the filter for tears, dents, or loose seams before installing. A damaged filter won’t seal properly and can let unfiltered air through.

Over-Tightening or Forcing Parts

Xiaomi purifiers are designed to snap together easily. If something doesn’t fit, don’t force it. Double-check the model number and orientation. Forcing parts can crack the plastic or misalign components.

Frequently Asked Questions (Without a FAQ Section)

Throughout my research and personal use, I’ve encountered a lot of questions about filter changes. Let me address a few key ones in a natural way.

One thing people often ask is whether they can wash and reuse the filter. The short answer? No. Xiaomi filters are not washable. The HEPA material and carbon layers are delicate and will degrade if exposed to water. Even rinsing can damage the structure and reduce effectiveness.

Another common concern is cost. Yes, filters add up over time—especially if you replace them every 6 months. But consider it an investment in your health. The average person spends thousands on healthcare related to respiratory issues. A $40 filter every six months is a small price to pay for cleaner air.

Some users worry about compatibility between models. For example, can you use a Mi Air Purifier 3H filter in a Pro H? Generally, no. Each model has a unique filter design. Always check the model number on your purifier and match it to the filter. The Mi Home app can also help identify the correct part.

Finally, what do you do with the old filter? Unfortunately, most Xiaomi filters aren’t recyclable due to the mixed materials. Dispose of them in your regular trash. Some cities have electronic waste programs that accept air filters—check with your local waste management service.

Final Thoughts: Breathe Easy with a Fresh Filter

Changing your Xiaomi air purifier filter might seem like a small task, but it has a big impact. It’s one of the simplest ways to protect your health, extend the life of your device, and ensure you’re breathing the cleanest air possible. In 2026, with air quality becoming an increasing concern in cities worldwide, this routine maintenance is more important than ever.

Remember, your purifier is only as good as its filter. Don’t wait for symptoms or warnings—stay proactive. Set reminders, use the app, and replace the filter on time. Whether you’re a seasoned Xiaomi user or new to air purification, this guide should give you the confidence to keep your home’s air fresh and healthy.

So go ahead—unplug that purifier, pop in a new filter, and reset that counter. Your lungs (and your purifier) will thank you.

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Frequently Asked Questions

How do I know when to change my Xiaomi air purifier filter?

Your Xiaomi air purifier will typically notify you via the Mi Home app when the filter needs replacing, usually after 6–12 months of use. You can also check the filter status manually in the app under the device settings.

What type of filter does the Xiaomi air purifier use?

Most Xiaomi air purifiers use a 3-layer HEPA filter that captures dust, pollen, and odors. Always check your specific model to ensure you purchase the correct replacement filter for optimal performance.

Can I clean and reuse the Xiaomi air purifier filter?

No, the HEPA filter in Xiaomi air purifiers is not washable or reusable. Attempting to clean it can damage the filter and reduce air purification efficiency—always replace it when prompted.

How do I replace the filter in my Xiaomi air purifier?

Turn off and unplug the purifier, then open the front panel and remove the old filter. Insert the new filter with the arrow pointing inward, close the panel, and reset the filter life in the Mi Home app.

Where can I buy a genuine Xiaomi air purifier filter?

You can purchase authentic Xiaomi air purifier filters from the official Mi Store, Amazon, or authorized retailers. Always verify the model number to ensure compatibility and avoid counterfeit products.

Do I need to reset the filter timer after changing the filter?

Yes, after installing a new filter, you must reset the filter life in the Mi Home app to ensure accurate monitoring. This helps maintain optimal performance and timely future replacements.