How to Change Mi Air Purifier Filter 2026 Guide

Changing the Mi Air Purifier filter is quick and essential for maintaining optimal air quality. Follow the simple steps in this 2026 guide to safely remove the old filter, install the new one, and reset the filter life indicator for peak performance. Regular replacement ensures your purifier works efficiently and keeps your indoor air clean and healthy.

Key Takeaways

• Power off first: Always unplug the purifier before starting filter changes.
• Open back panel: Press the release button to access the filter compartment.
• Remove old filter: Gently pull out the used filter by the side tabs.
• Insert new filter: Align arrows and slide in until it clicks securely.
• Reset filter timer: Hold reset button for 3 seconds after replacement.
• Check for leaks: Ensure the panel seals tightly to avoid air bypass.
• Replace every 6–12 months: Maintain efficiency with timely filter swaps.

Why Changing Your Mi Air Purifier Filter Matters

Let’s be honest—how often do you think about the filter inside your air purifier? If you’re like most people, probably not enough. I used to treat my Mi Air Purifier like a set-and-forget appliance. It sat in the corner of my living room, quietly humming, and I assumed it was doing its job. That was until I started noticing a faint musty smell, and my allergies crept back in. A quick check of the app showed a red warning: Filter needs replacement. That was my wake-up call.

Your Mi Air Purifier is only as good as its filter. Think of it like a car engine—without fresh oil, it won’t run efficiently. Over time, the filter traps dust, pollen, pet dander, smoke, and even microscopic pollutants. But once it’s full, it can’t absorb anymore. In fact, a clogged filter can even release trapped particles back into the air, making your indoor air worse than before. Changing the filter isn’t just maintenance—it’s essential for clean, healthy air. And the good news? It’s one of the easiest DIY tasks you’ll do all year.

How to Know When It’s Time to Change Your Mi Air Purifier Filter

You don’t need to wait for a warning light (though the Mi app is great for that). There are several clear signs that your filter is due for a swap. Let’s break them down so you can stay ahead of the game.

1. Check the Mi Home App

The easiest way to know is through the Mi Home app. When you open it, tap on your air purifier. You’ll see a filter life indicator—usually a percentage bar. If it’s below 10%, it’s time. If it’s red or flashing, change it immediately. I once ignored it for two weeks, thinking, “It’s still working,” but the app doesn’t lie. Once it hits 0%, the purifier may even slow down or stop filtering effectively.

2. Notice a Change in Air Quality

Are your allergies flaring up? Is there a stale or dusty smell in the room? These are classic signs the filter is saturated. I noticed this during spring when pollen counts spiked. My purifier was running nonstop, but my eyes were still itchy. A new filter fixed it in 24 hours. Also, if you live with smokers or have pets, you’ll need to change filters more often—sometimes every 3–4 months instead of 6–8.

3. Listen to the Purifier’s Performance

A clogged filter forces the purifier to work harder. You might hear it running louder than usual, especially on lower settings. If it sounds like it’s straining, the airflow is restricted. This not only reduces efficiency but can shorten the life of the motor. I learned this the hard way when my purifier started making a low, groaning noise. A new filter brought the noise level back to a quiet hum.

4. Visual Inspection (If You’re Curious)

If you’re the hands-on type, you can pop open the purifier and take a look. The filter should be white or light gray when new. If it’s dark gray, brown, or has visible dust buildup, it’s past its prime. Just don’t do this too often—frequent opening can let dust in and reduce the lifespan of the new filter.

What You’ll Need to Change the Mi Air Purifier Filter

Don’t worry—this isn’t a tool-heavy project. You don’t need a screwdriver, wrench, or any special gear. But having the right supplies ready makes the process smooth and quick. Here’s your checklist:

• Replacement filter (make sure it matches your model—more on that below)
• Clean, dry cloth (microfiber works best)
• Vacuum with a soft brush attachment (optional but helpful)
• Trash bag or bin (to dispose of the old filter)
• Your phone or tablet (to use the Mi Home app)

Choosing the Right Filter: Model Matters

This is where many people slip up. Mi makes several air purifier models—Mi Air Purifier 3, 3H, 4, 4 Lite, 4 Pro, and others—and their filters are not interchangeable. Using the wrong one won’t fit properly and can damage the unit.

Here’s a quick guide:

• Mi Air Purifier 3 / 3H: Use the Mi Replacement Filter 3
• Mi Air Purifier 4 / 4 Lite: Use the Mi Replacement Filter 4
• Mi Air Purifier 4 Pro: Use the Mi Replacement Filter 4 Pro

Pro tip: Check the label on your old filter or take a photo of the model number inside the purifier. When buying online, double-check the product description. I once ordered the wrong one because I assumed “4” meant all fourth-gen models—nope. A quick call to customer support saved me, but it cost me a week of delay.

Where to Buy Replacement Filters

You have options:

• Official Xiaomi Store (Mi.com or Mi Home app): Most reliable, but sometimes pricey
• Authorized retailers (Amazon, Flipkart, Best Buy): Often have deals and fast shipping
• Third-party sellers: Cheaper, but beware of knockoffs. I once bought a “Mi-compatible” filter that fell apart after two weeks. Stick to reputable brands like Honeywell or Blueair if you go third-party.

Set a reminder to buy a new filter when your app shows 20% life left. This gives you a buffer in case of shipping delays.

Step-by-Step Guide: How to Change Mi Air Purifier Filter

Ready to swap that filter? Let’s walk through it together. I’ll use the Mi Air Purifier 3H as an example—but the steps are nearly identical for all models. The whole process takes 5–10 minutes.

Step 1: Power Off and Unplug

Safety first. Always turn off and unplug the purifier before opening it. I learned this when I accidentally triggered the fan while cleaning—scared the cat, and me. Even if it seems obvious, make it a habit.

Step 2: Open the Back Panel

Locate the back cover. It’s held by magnetic latches (no screws). Gently press the two small tabs on the sides and pull the panel toward you. It should pop open with a soft click. If it’s stiff, don’t force it—check for hidden latches or debris. On older models, you might need to slide the panel up slightly before pulling.

Step 3: Remove the Old Filter

The filter sits in a plastic frame. Grab the two tabs on the sides and pull it straight out. Be careful—there might be loose dust or debris. I always do this over a trash bin to catch any fallout. If the filter is stuck, wiggle it gently side to side.

Inspect the old filter. Is it dark and dense? That’s a good sign it’s done its job. Now, take a moment to clean the inside of the purifier with a dry cloth. Wipe down the fan blades, sensors, and the filter chamber. Use the vacuum’s brush attachment if there’s visible dust. This prevents recontamination when you insert the new filter.

Step 4: Insert the New Filter

Here’s the key: Make sure the airflow direction is correct. The filter has an arrow on one side—point it into the purifier (toward the fan). If you reverse it, air won’t flow properly, and the purifier will struggle.

Slide the new filter into the frame until it clicks. You should feel it lock in place. Don’t force it—if it’s not going in, double-check the model and orientation. I once tried to push too hard and bent the frame. Oops.

Step 5: Reattach the Back Panel

Align the panel with the slots and press it firmly until the magnetic latches click. Give it a gentle tug to make sure it’s secure. If it feels loose, check for dust or debris blocking the seal.

Step 6: Reset the Filter Life in the App

This step is crucial. Plug the purifier back in and open the Mi Home app. Tap on your device, go to “Settings,” and select “Reset Filter Life.” This resets the timer and starts the countdown for your new filter. If you skip this, the app will keep showing a low percentage, even with a fresh filter. I forgot once and panicked when it said 5% life left after just one day!

Step 7: Test the Purifier

Turn it on and run it on medium speed for 10 minutes. Listen for smooth airflow. Check the app to confirm the filter life is now at 100%. If everything looks good, you’re all set!

Tips to Extend Your Mi Air Purifier Filter’s Lifespan

You don’t have to change the filter every few months if you take care of it. A few smart habits can stretch its life by 20–30%. Here’s how:

1. Pre-Clean the Air with a Vacuum or Broom

Large dust particles clog the filter fast. If you vacuum or sweep your floor before turning on the purifier, you’re removing the big stuff before it reaches the filter. I do this every time I clean the house—my filter lasts an extra month.

2. Use the Right Fan Speed

Don’t run it on “Turbo” mode 24/7. Use Auto mode (if your model has it) or keep it on low/medium in cleaner environments. High speeds pull in more particles, which means faster filter saturation. I only go turbo during cooking or when my dog sheds heavily.

3. Keep It Away from High-Dust Areas

Avoid placing the purifier near kitchens, entryways, or pet beds. These spots have more airborne dust and hair. I moved mine from the kitchen corner to the living room center, and the filter lasted 2 months longer.

4. Clean the Exterior and Pre-Filter Monthly

The outer shell and pre-filter (the mesh layer on the new filter) catch large debris. Wipe them with a dry cloth once a month. If your model has a removable pre-filter (like the 4 Pro), rinse it under water and let it dry completely before reinserting. This keeps the main filter from working overtime.

5. Monitor Air Quality with the App

The Mi Home app shows real-time PM2.5 levels. Use this to decide when to run the purifier. If the air is clean, turn it off. Less runtime = less filter wear. I check the app in the morning and evening—it’s like a health check for my air.

Common Mistakes to Avoid When Changing Your Filter

Even simple tasks can go sideways. Here are the top mistakes I’ve made (and seen others make)—and how to avoid them.

1. Forgetting to Reset the Filter Life

As mentioned, this is a big one. Without resetting, the app will keep showing low life, and you might change a good filter too soon. Set a phone reminder for “Reset filter life” right after you insert the new one.

2. Using the Wrong Filter

Double-check the model. Don’t rely on memory. Take a photo of your old filter’s label and keep it in your phone. When in doubt, contact Mi support.

3. Not Cleaning the Purifier Interior

Reinserting a new filter into a dusty chamber defeats the purpose. Spend 2 minutes wiping down the inside. It’s like changing the oil without cleaning the engine—pointless.

4. Ignoring the Airflow Direction

Arrow goes in. Simple, but easy to miss when you’re in a rush. I’ve seen people flip it and wonder why the purifier isn’t working well. Take an extra second to check.

5. Buying Cheap Knockoff Filters

Yes, they’re cheaper, but they’re often made with lower-grade materials. They might not seal properly, reducing filtration efficiency. Stick to genuine or trusted third-party brands. Your lungs will thank you.

6. Waiting Too Long to Replace

Don’t push it to 0%. A filter at 5% life is already struggling. Replace it at 10–15% to maintain peak performance. I once waited until 2% and noticed a 30% drop in air quality—my allergies came back with a vengeance.

Filter Lifespan Comparison Table

Mi Air Purifier Model	Recommended Filter	Standard Lifespan (Months)	Lifespan in High-Pollution Areas	Lifespan with Pets/Smokers
Mi Air Purifier 3 / 3H	Mi Replacement Filter 3	6–8	4–5	3–4
Mi Air Purifier 4 / 4 Lite	Mi Replacement Filter 4	6–8	4–5	3–4
Mi Air Purifier 4 Pro	Mi Replacement Filter 4 Pro	8–10	5–6	4–5

Note: Lifespans are estimates based on average room size (300–400 sq ft), 12 hours daily use, and moderate pollution levels. Actual results vary.

Final Thoughts: A Small Task with Big Benefits

Changing your Mi Air Purifier filter isn’t glamorous, but it’s one of the most impactful things you can do for your home’s air quality. It takes less than 10 minutes, costs less than a coffee a month (if you buy smart), and makes a real difference in how you breathe, sleep, and feel.

I’ve made it a habit: every time I change my toothbrush, I check the purifier’s app. If it’s below 20%, I order a new filter. That way, I’m never caught off guard. And honestly, there’s a small satisfaction in knowing I’ve just given my home a “clean air tune-up.”

Remember: a clean filter means a clean home. It’s not just about removing dust—it’s about reducing allergens, odors, and invisible pollutants that affect your health. So next time you’re relaxing on the couch, take a deep breath and ask yourself: when was the last time I changed my filter? If you’re unsure, now’s the perfect time to do it. Your lungs (and your Mi Air Purifier) will thank you.

Frequently Asked Questions

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

Most Mi air purifiers have a built-in filter replacement indicator that lights up or sends an alert when it’s time to change the filter. You should also consider replacing it every 6-12 months depending on usage and air quality in your area.

Can I change the Mi air purifier filter without professional help?

Yes, changing the Mi air purifier filter is a simple DIY process. The device is designed for easy filter access, and the user manual provides clear step-by-step instructions for replacement.

What tools do I need to change the Mi air purifier filter?

You typically don’t need any tools to change the Mi air purifier filter. The process involves opening the front panel, removing the old filter, and inserting the new one – all done by hand.

Where can I buy genuine replacement filters for my Mi air purifier?

Authentic Mi air purifier filters are available on the official Xiaomi website, authorized retailers, and major e-commerce platforms like Amazon. Always check for compatibility with your specific model before purchasing.

How do I reset the filter change indicator on my Mi air purifier?

After changing the filter, hold down the reset button (usually for 3-5 seconds) until the indicator light turns off or resets. This process varies slightly by model, so consult your user manual for exact steps.

Is it possible to clean and reuse a Mi air purifier filter instead of changing it?

No, Mi air purifier filters are not designed to be cleaned or reused. The HEPA and activated carbon filters lose effectiveness over time, so regular replacement is necessary to maintain optimal air purification performance.