Choosing the right air purifier filter shouldn't be complicated… and now it’s not. We've renamed our Alen filters to help you find exactly what you need for cleaner, healthier air at home. What used to be Pure, Fresh, and Odor are now Essential, Advanced, and Ultimate. These are the same filters you know and love, just with different names to make everything easier.
So which filter is right for you? And how do you keep your Alen air purifier running at its best? Let's break it down. Because when you take care of your purifier, it takes care of you, so that you can create your own Utopiair™ with Alen.
Alen's new filter names:
Alen Filters Are Engineered for Excellence
Alen air purifiers use a layered system to help you achieve your Utopiair. All of our filters include a pre-filter, which serves as the first gentle catch for bigger particles like dust, hair, and pet dander. By grabbing these early, the pre-filter helps the inner layers stay protected and work more efficiently.
Next is the HEPA filter, the heart of the purification process. Its tightly woven fibers guide the air through a maze-like path, capturing tiny particles such as pollen, mold spores, bacteria, and even particles 0.1 micron and smaller. Some are caught as they brush against the fibers, others get trapped as they follow the twisting air path, and the smallest particles attach to the fibers naturally. This simple but powerful design even helps remove pollutants you cannot see.
For models with activated carbon, the next layer focuses on odors and gases. Activated carbon is full of microscopic pores that work like tiny sponges, absorbing unwanted smells, smoke chemicals, and VOCs from everyday products. As air moves through, these gases cling to the carbon instead of returning to your room.
After passing through each stage, the air flows back into your space cleaner, fresher, and easier to breathe. Your purifier repeats this cycle several times per hour, helping keep the air in your home feeling clear, comfortable, and truly your own.
Recap:
- Pre-filter captures larger particles like dust, hair, and pet dander
- HEPA filter traps fine particles as small as .1 micron, from mold spores to pollen
- Optional: Activated carbon absorbs gaseous pollutants and unwanted odors
Alen BreatheSmart Air Purifier Filters
At Alen, we've made it simpler to choose the right filter. We used to call them Pure, Fresh, and Odor, but now they're Essential, Advanced, and Ultimate. Same great quality, just easier to understand. These filters are suited for the entire BreatheSmart series, from the 75i to the 25i.
Essential Filter
The Essential Filter (originally known as the Pure Filter) is Alen’s entry-level option designed for everyday clean-air needs. It uses a medical-grade HEPA layer that captures 99.9% of airborne dust, viruses, allergens, and other fine particles that move through your space. Simple, reliable, and effective, the Essential Filter keeps your purifier performing at a high level while giving you a straightforward path to cleaner, healthier air.
The Essential Filter Captures:
- Allergies
- Dust
- Viruses*
*Viruses tested on MS-2 Bacteriophage
Advanced Filter
The Advanced Filter (previously called the Fresh Filter) is designed for those who want more control over their air quality. It includes the same medical-grade HEPA filtration found in the Essential Filter, then adds an activated carbon layer for targeted protection against asthma triggers, chemical fumes, VOCs, smoke, and other everyday pollutants. This activated carbon layer helps keep your air cleaner, fresher, and more comfortable, especially in homes with strong odors or sensitive lungs.
The Advanced Filter Addresses:
- Allergies
- Dust
- Viruses*
- Wildfire smoke
- Cigarette and cigar smoke
- Urban Pollution
*Viruses tested on MS-2 Bacteriophage
Ideal for people with:
- Respiratory illnesses
- Asthma
Ultimate Filter
The Ultimate Filter (formerly the Odor Filter) is Alen’s most comprehensive clean-air solution. It pairs a medical-grade HEPA filter with a proprietary carbon catalyst blend to take on the toughest air challenges. This top-tier design targets asthma triggers, chemicals and VOCs, smoke, odors, mold, and the pollutants common in busy, pet-filled homes. If you want the strongest filtration Alen offers, the Ultimate Filter delivers dependable, high-impact performance.
The Ultimate Filter Addresses:
- Allergies
- Dust
- Viruses*
- Wildfire smoke
- Cigarette and cigar smoke
- Urban Pollution
- Pet odor and dander
- Household odors
- Cooking odors
- Mold*
*Viruses tested on MS-2 Bacteriophage and mold on Aspergillus Niger.
Ideal for people with:
- Respiratory illnesses
- Asthma
Tips for Maximizing Your Alen Air Purifier Filter
Now, let’s get to any questions you have for us. From knowing when it’s time for a new filter, to understanding the Alen Forever Guarantee, to easy replacement steps and cost details, we have the answer for you.
How Often You Should Change Your Filter
While the average lifespan of an Alen air filter can last around 12 months, this can vary depending on certain factors and models. Variables such as the size of the room, the air quality, and the specific use case all play critical roles in determining how long a filter will last. In environments with higher concentrations of pollutants or allergens (like a home with lots of dogs or where people often smoke), filters may require replacement every six to nine months.
Your unit includes a helpful filter indicator that lets you know when it’s time for a replacement. This smart sensor pays attention to things like airflow and particle buildup so it can guide you toward the right moment to refresh your filter. Checking in on your filter and keeping an eye on the indicator is an easy way to stay connected to your purifier’s needs. While the suggested time frames are a great starting point, every home has its own routine and air conditions. A quick check now and then helps ensure your filter is replaced when it truly needs it, keeping your purifier running at its best and supporting the clean, comfortable air you enjoy.
In Short: your Alen filter can last anywhere from 6 to 15 months, depending on several factors.
How to Change The Filter on Your Alen Air Purifier
Begin by unplugging the air purifier. If the plug is not accessible, opening the front panel will automatically shut the unit off through its safety mechanism. Remove the front panel and the used filter. Place it in a bag for disposal to prevent release of trapped particles. Insert the new filter, ensuring it is properly seated and oriented in the proper direction. Close the compartment and restore power to the purifier.
Step-by-step instructions:
- Unplug the purifier (or open the front panel to trigger auto shutoff)
- Remove the front panel
- Remove and bag the used filter, remove plastic from the new filter
- Install the new filter securely and in the right direction
- Replace the panel and power the unit
The Importance of the Filter Replacement Indicator on Alen Air Purifiers
The filter replacement indicator on Alen Air Purifiers takes the guesswork out of maintenance by signaling when it’s time for a new filter. When the light turns red, the filter has reached the end of its lifespan and should be replaced.
After installing a new filter, the purifier should automatically reset. If it doesn’t, just hold the filter button for five seconds. This allows the purifier to accurately track the next replacement cycle. The indicator simplifies upkeep and helps maintain consistent, high-quality air in your home.
Understanding the Signs of a Faulty or Worn-Out Filter
Recognizing the signs of a worn-out filter helps keep your Alen Air Purifier performing efficiently. Reduced airflow is often the first clue, as a saturated filter restricts air movement. Increased dust in your home, lingering odors, or a rise in allergy symptoms can also signal that the filter is no longer capturing pollutants effectively. In some cases, the purifier may sound louder or seem to work harder as it pushes air through a clogged filter.
The filter indicator light provides the clearest guidance. It shifts to yellow as the filter nears the end of its life, and a red light means it is time to replace it.
Cost Considerations of Filters for Long-Term Maintenance Needs
Replacement filters are the primary recurring expense for your air purifier, and prices vary based on the model and the level of filtration you choose. Higher-performance filters designed to address complex air quality concerns generally cost more.
Using genuine Alen filters or a filter subscription keeps air quality consistent and your purifier at optimal performance. With a filter subscription, you don’t have to spend time shopping online or keeping track of when to purchase your next filter.
You’ll save 10 percent, get replacements delivered automatically every 6, 9, or 12 months, and never have to worry about forgetting a filter change again.
Filter subscription benefits:
- Save 10% on every filter replacement.
- Peace of mind that you're covered and won’t need to worry about providing proof of regular Alen® filter replacements in your unit: we’ll already have your orders on record.
- Stay consistent with regular filter replacements to get the most out of your air purifier with automatic shipments.
One-Time Purchase
| Alen Model | Essential Filter | Advanced Filter | Ultimate Filter |
|---|---|---|---|
| 75i | $99.00 | $129.00 | $139.00 |
| 45i | $69.00 | $89.00 | $99.00 |
| 35i | $54.00 | $64.00 | $69.00 |
| 25i | $44.00 | $49.00 | $54.00 |
Subscribe and Save 10%: Delivery Every 6, 9, or 12 Months
| Alen Model | Essential Filter | Advanced Filter | Ultimate Filter |
|---|---|---|---|
| 75i | $89.10 | $116.10 | $125.10 |
| 45i | $62.10 | $80.10 | $89.10 |
| 35i | $48.60 | $57.60 | $62.10 |
| 25i | $39.60 | $44.10 | $48.60 |
Alen Forever Guarantee
The Alen Forever Guarantee reflects Alen’s commitment to long-lasting performance and reliable quality. If your purifier ever experiences an issue, it will be replaced, giving you long-term confidence in your investment.
To keep this coverage active, simply use genuine Alen filters and follow the recommended maintenance guidelines. Doing so ensures your purifier performs as designed and allows you to receive the full benefit of the Forever Guarantee.
Where Can I Buy Real Alen Filters?
Genuine Alen filters should be purchased through Alen’s official website or Amazon, where authorized sellers are limited to ensure authenticity. Using genuine filters is essential to maintain performance and protect the Alen Forever Guarantee, which remains valid only with an active filter subscription or proof of regular replacement using approved Alen filters. Off-brand or third-party filters can reduce air-cleaning efficiency and even break your Alen purifier, ultimately costing more over time while voiding the warranty.
When selecting a filter, it is important to confirm compatibility with your specific purifier model. Alen offers a range of model-specific filter options designed for different air quality needs, including general HEPA filtration, as well as options that target VOCs, heavy smoke, or strong household odors. Genuine Alen filters are engineered to fit properly and perform reliably, ensuring your purifier delivers the clean air it was designed to provide without the hidden risks associated with third-party alternatives.
Making The Most of Your Alen Air Purifier
Regular maintenance helps your Alen air purifier perform at its highest level. As the filter collects dust, allergens, smoke, and other particles, it gradually becomes saturated, which reduces airflow and overall efficiency. Replacing the filter on schedule and keeping the unit clean ensures smooth airflow, less strain on the purifier, and consistently supportive air cleaning.
Preventing A Clog In The System
Letting filter replacements slide can take a real toll on your Alen air purifier. When a filter gets clogged, it means reduced airflow, slower less effective aircleaning,. And if you use off-brand filters or skip replacements altogether, the Alen Forever Guarantee won’t apply. A little routine care goes a long way in keeping your purifier running smoothly and protecting your investment.
Making Your Alen’s Job Easier
Your environment plays a big role in how often your Alen air purifier needs attention. If you live in a high-pollution area or share your home with smokers or pets, the filter will fill up faster and may need more frequent replacement. It’s also important to keep the purifier away from water sources like sinks, showers, or pools. Being mindful of these factors helps your purifier stay reliable and keeps the healthy air flowing.
Take Care of Your Alen and Breathe In The Benefits
Keeping your Alen air purifier in good shape is simple. A little routine cleaning and timely filter checks are all it takes to keep it running smoothly and delivering clean, fresh air.
General Maintenance Requirements for Alen Air Purifiers
Maintaining an Alen air purifier comes down to two simple tasks: keeping the unit clean and replacing the filter on a regular schedule. How often you’ll need to do this depends on your home and how much the purifier runs, but a good guideline is to check the filter every two to three months and wipe down the exterior about once a month. And for the best performance, always use genuine Alen filters designed for your specific model.
How to Clean the Outside of Your Unit Effectively
- Make sure the device is unplugged to prevent any electrical accidents.
- Dampen a clean towel slightly with soap and water to clean the control panel.
- Gently dry with a soft cloth or paper towel.
- Once completely dry, plug the unit back in.
Important: Do not use harsh cleaning solutions or scrubbing pads. Glass cleaner (like Windex) is okay to use, but make sure the liquid does not seep into the unit and cause damage.
How to Clean Your Pre-filter
Make sure to vacuum the pre-filter every 1-2 months, depending on your environment.
- Unplug your unit and remove the front panel.
- Use a soft brush attachment on your vacuum to gently lift dust off of the pre-filter. Keep the filter in the unit while vacuuming.
- Vacuum the outward-facing side of the filter where the most dust and hair collect.
- Avoid vacuuming the HEPA or Carbon layers, as high suction can damage their fibers.
- When finished, replace the front panel and plug in your unit.
FAQs
Can air purifier HEPA filters be washed?
No, HEPA filters are not washable. Water and detergents break down the fibers that capture microscopic particles, which means the filter can no longer clean your air effectively. For best performance, vacuum your prefilter (monthly or bimonthly) to help maintain airflow and replace your HEPA filter on the recommended schedule.
How much does a replacement HEPA filter cost?
Prices vary depending on the model and the level of odor or chemical protection you choose. Most high-quality HEPA filters range from moderate to premium pricing, with specialty filters costing more due to added layers, like activated carbon. Alen filters can cost from about $44 to $130 per filter. If you enroll in Alen’s filter-subscription program (which comes with the Forever Guarantee), you receive replacements on schedule while keeping your lifetime warranty active.
What is the regular price for a one-time purchase of a HEPA filter?
A single HEPA filter purchase typically falls within a mid-range price point for air purifier accessories. The exact amount depends on the size of your purifier and the type of filter technology included, but most one-time purchases land in the standard retail range for long-lasting, high-efficiency filters. Alen filters can cost from about $44 to $130 per filter.
What does the filter indicator light mean?
The filter indicator light on your Alen unit tells you when your filter is nearing the end of its life. Yellow means it’s getting close, and red means it’s time to replace it.
Will using the wrong filter affect purifier performance?
Yes. Using the wrong filter can noticeably reduce your purifier’s performance. Filters that aren’t designed for your specific Alen model may not fit correctly, which can allow air to bypass the filtration layers entirely. Off-brand or incompatible filters also may not meet Alen’s efficiency standards, leading to weaker airflow, less effective particle capture, and even the risk of pushing trapped pollutants back into your space. For the best results, always use the genuine filter created for your purifier model.
Which is better, the Alen BreatheSmart 75i or Alen BreatheSmart 45i?
Both the Alen BreatheSmart 75i and 45i deliver what people love about Alen: powerful HEPA filtration, smart sensors, app control, and whisper-quiet operations. The 75i model is the best fit for large, open spaces where you want maximum airflow and powerful whole-room purification. The Alen BreatheSmart 45i is ideal for medium-sized rooms, delivering strong performance in a compact design with a lower unit price. Whichever you choose, you’re getting clean air backed by the same trusted technology.
