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Replacement filters can look nearly identical online, but the wrong size or purifier match makes a low price meaningless. The Midiex 4-Pack MA25 Replacement Filter is an aftermarket set made for the Medify Air MA-25 Series, including S1, B1, and W1 variants, with H13 HEPA media, a pre-filter, and activated carbon. Its biggest appeal is getting four compatible filter pieces in one package, while the main tradeoff is that it is not the genuine Medify Air filter set. This review helps you check fit, filtration design, maintenance, and value before you buy.
Quick Verdict
Rating: 8/10, Recommended with caveats
Best For: MA-25 owners who want a multi-pack aftermarket replacement and are comfortable using a non-OEM filter.
Bottom Line: The Midiex MA25 set gives you a 3-in-1 filtration design and four replacement filter pieces sized for the MA-25 platform. The key limitation is that it is a third-party option, so buyers who want guaranteed OEM construction and support should compare it with Medify Air’s genuine filter set.
| Specification | Detail |
|---|---|
| Brand | Midiex |
| Model | MA25 Replacement Filter |
| Product type | Aftermarket air purifier replacement filter |
| Quantity | 4 filter pieces |
| Filtration design | 3-in-1: pre-filter, H13 HEPA media, activated carbon |
| Claimed particle capture | 99.97% of particles down to 0.3 microns |
| MERV rating | 17, as listed for this replacement filter |
| Dimensions | 9.6 x 6.8 x 2 inches per filter |
| Construction | Pleated filter construction with activated carbon |
| Compatibility | Medify Air MA-25 Series S1/B1/W1 |
| Warranty | 6-month warranty listed for the Midiex replacement filter |
Before You Buy: Midiex is the filter brand, but the purifier it is designed to fit is the Medify Air MA-25. This is an aftermarket replacement, not the genuine Medify Air MA-25 Filter Set. Confirm your purifier model and the package contents before ordering.
Key Takeaways
- The Midiex MA25 package contains four aftermarket replacement filter pieces for the Medify Air MA-25 Series S1/B1/W1.
- The listed 3-in-1 design combines a pre-filter, H13 HEPA media, and activated carbon for particle and odor filtration.
- The listing specifies 9.6 x 6.8 x 2-inch dimensions, a pleated build, and a MERV 17 rating.
- The MA-25 purifier uses filters on both sides, so check how the four-piece package maps to complete replacement cycles for your unit.
- For maintenance timing, follow the MA-25 filter indicator and manual rather than relying on a fixed six-month schedule.
What Is the Midiex MA25 Replacement Filter?
The Midiex MA25 Replacement Filter is a third-party replacement made for the Medify Air MA-25 purifier platform. It is marketed for the MA-25 Series S1, B1, and W1 and comes as a four-piece package. Each filter uses a pleated 3-in-1 layout with a pre-filter, H13 HEPA media, and activated carbon.
The H13 layer is listed to capture 99.97% of airborne particles down to 0.3 microns, while the carbon layer is intended to help with common household odors. This combination matches the basic filtration approach used by the MA-25 platform, which relies on pre-filtration, HEPA media, and carbon filtration.
The main reason to consider Midiex is value from a multi-pack. The reason to pause is equally clear: it is not an OEM Medify filter, so material density, carbon quantity, fit tolerance, and long-term airflow can differ from genuine replacement filters even when the outer dimensions match.
Who Should Buy It?
Best For
- Owners of a Medify Air MA-25 Series S1, B1, or W1 purifier.
- Buyers who prefer a four-piece aftermarket pack instead of a genuine OEM set.
- Homes that want both particle filtration and an activated-carbon layer for everyday odors.
Skip If
- You want genuine Medify Air replacement filters and OEM support.
- Your purifier is not an MA-25 Series model or you cannot confirm S1/B1/W1 compatibility.
- You need a washable or permanent filter, because this HEPA replacement is not designed for washing and reuse.
Filtration Design and Everyday Performance
H13 HEPA Layer
The Midiex listing describes H13 HEPA media with a 99.97% capture claim for particles down to 0.3 microns. In practical terms, that targets fine airborne material such as dust, pollen, and other small particles that pass through a basic pre-filter. The pleated construction increases filter surface area without making the panel physically larger.
Do not treat the filter as a cure or medical device. Its job is to support the purifier’s particle-removal function. Actual room-air results still depend on fan speed, room size, filter condition, and how consistently the purifier runs.
Activated Carbon and Odor Control
The activated-carbon layer adds odor control to the particle filtration system. It can help reduce everyday smells from cooking, smoke, or household activity as air passes through the media. Carbon filters work by adsorbing odor-causing compounds, so their usefulness declines as the carbon becomes loaded.
This is also an area where aftermarket filters can vary. The product listing confirms activated carbon is present, but it does not provide a carbon weight or thickness. If odor control is your top priority, that missing detail is worth considering when you compare Midiex with the genuine Medify filter set.
Fit, Size, and Compatibility
Each Midiex filter is listed at 9.6 x 6.8 x 2 inches and is made for the MA-25 Series S1/B1/W1. Correct fit matters because gaps around the filter can let air bypass the media. Before installing, compare the old filter’s shape, pull-tab position, and dimensions with the new panel.
The MA-25 purifier has filters on both sides of the unit. That makes package count important: a box of four individual filter pieces is different from four full two-filter replacement sets. Check the current product photos and package wording so you know exactly how many complete changes you are buying.
How to Install and Maintain Your Midiex MA25 Filters
Installation is tool-free, but you should follow the MA-25 procedure rather than simply pushing a new panel into place. Unplug the purifier first. Open the filter grille covers on both sides, remove the old filters using their pull tabs, and install the replacements in the same orientation before snapping the grille covers back into position.
After installation, plug the purifier back in and reset the MA-25 filter indicator according to the purifier manual. Medify’s current guidance for the MA-25 says to press and hold the dimmer button for three seconds after a filter change. That resets the replacement timer so the indicator can track the next service interval.
For cleaning, do not wash the HEPA media. Medify advises vacuuming the pre-filter surface periodically under normal use. If your Midiex packaging gives different care directions, follow the filter maker’s instructions as long as they do not conflict with the purifier’s safety guidance.
Pro Tip: When you remove the old filters, take a quick photo of their orientation and tab position. Matching that layout during installation helps you avoid installing the replacement backward.
How It Performs in Real Use
For Daily Dust and Pollen
The combination of a pre-filter and H13 HEPA layer is the part that matters most for routine particle control. The pre-filter catches larger debris before it reaches the finer media, while the HEPA layer handles smaller particles. You will get the best airflow when the intake grilles stay clear and the pre-filter surface is not packed with dust.
For Cooking and Household Odors
The carbon layer gives the Midiex filter an advantage over a particle-only replacement when you are dealing with ordinary odors. It can help reduce smells as air circulates through the purifier, but it will not remove the source of an odor. Ventilation and source control still matter, especially for heavy smoke or persistent cooking fumes.
For Bedrooms and Home Offices
The filter itself does not set the MA-25’s room coverage or noise level, but a clean, correctly fitted filter helps the purifier maintain normal airflow. If you use the MA-25 for long hours in a bedroom or office, check the filter more often because continuous operation can bring the replacement indicator on sooner.
For Long-Term Use
A fixed six-month rule is too simple for every home. Medify currently lists the MA-25 filter life at about 2,500 operating hours, roughly three to four months of continuous use under its stated conditions. Dust load, smoke, pets, fan speed, and daily runtime can shorten or extend how quickly a replacement becomes necessary, so use the purifier’s indicator and the condition of the filter as your guide.
Common Mistakes to Avoid
- Buying by appearance alone: Confirm MA-25 Series S1/B1/W1 compatibility before ordering.
- Ignoring the two-sided filter setup: Verify whether the four pieces equal two full purifier changes for your configuration.
- Washing HEPA media: Moisture can damage filter media and is not part of the recommended maintenance routine.
- Forgetting the reset: Reset the filter indicator after installing the replacements so the MA-25 can track the next interval.
- Waiting only for a calendar date: Heavy dust or smoke can load filters faster than a simple month-based schedule suggests.
Pros and Cons
Pros
- Four replacement filter pieces in one package.
- 3-in-1 design combines pre-filter, H13 HEPA media, and activated carbon.
- Listed specifically for Medify Air MA-25 Series S1/B1/W1 compatibility.
- Pleated design provides a large filtration surface in a compact panel.
- Tool-free replacement process in the MA-25 purifier.
Cons
- It is an aftermarket filter, not a genuine Medify Air replacement set.
- The listing does not state the amount or weight of activated carbon.
- You must confirm how four individual filter pieces translate into complete two-sided MA-25 replacement cycles.
What Are Buyers Saying About the Midiex 4-Pack?
Current marketplace indexing shows the Midiex MA25 4-pack is consistently well-reviewed, but ratings and review totals can change, so this article does not lock in a star score or review count. The buyer themes that matter most for this type of product are fit, ease of installation, airflow, odor control, and how long the filter remains usable before the purifier asks for a replacement.
When reading recent reviews, pay extra attention to comments from verified MA-25 owners who mention the exact S1, B1, or W1 model. Fit-related feedback is more useful than general praise because even a good filter is a poor buy if the frame does not seal correctly in your purifier.
Is It Worth the Price?
The Midiex four-pack is best viewed as a value-focused aftermarket option. You are buying multiple replacement pieces with the same basic three-stage approach expected for the MA-25 platform, rather than paying for the genuine Medify Air filter set. That can make sense when replacement frequency matters and you want spares on hand.
The value tradeoff is OEM certainty. Medify’s genuine MA-25 Filter Set is designed and supported by the purifier manufacturer, while Midiex relies on claimed compatibility. Midiex is worth considering if the current price is meaningfully lower and recent buyer feedback confirms a snug fit. If warranty support, exact OEM media construction, or manufacturer-backed compatibility matters more than upfront cost, the genuine set is the safer comparison.
How It Compares to Alternatives
The clearest alternative is the genuine Medify Air MA-25 Filter Set. The OEM option gives you direct manufacturer compatibility and published guidance for the MA-25 filtration system, while Midiex focuses on multi-pack value. Other third-party MA-25-compatible multipacks also exist, but filter thickness, carbon content, warranty terms, and package count can vary.
Choose Midiex when your priority is a four-piece aftermarket package with H13 HEPA and activated carbon. Choose the Medify Air set when you prefer manufacturer-backed fit and do not want to compare third-party construction details.
Frequently Asked Questions
Is the Midiex MA25 filter made by Medify Air?
No. Midiex is a third-party replacement filter brand. The filter is marketed as compatible with the Medify Air MA-25 Series, but it is not the genuine Medify Air MA-25 Filter Set.
Which MA-25 models are listed as compatible?
The Midiex listing identifies the Medify Air MA-25 Series S1, B1, and W1. Check your purifier label before ordering, especially if you have an older or differently labeled MA-25 variant.
How many filters are in the package?
The package is listed as a four-pack with four replacement filter pieces. Because the MA-25 uses filters on both sides, confirm the current package labeling so you know how many complete purifier changes those four pieces provide.
How often should you replace the MA25 filters?
Follow the MA-25 filter indicator and your purifier manual. Medify currently lists about 2,500 operating hours, or roughly three to four months of continuous use, for its MA-25 filter life, but real replacement timing varies with dust, smoke, pets, fan speed, and runtime.
Can you wash and reuse the Midiex MA25 filters?
No washing is recommended for this HEPA-style replacement. For routine upkeep, vacuum loose dust from the pre-filter surface and replace the filter when it is loaded or when the purifier indicates service is due.
How do you reset the MA-25 after changing filters?
After the filters are installed and the purifier is powered back on, Medify’s MA-25 guidance says to press and hold the dimmer button for three seconds. The filter indicator should reset so the unit can track the next replacement interval.
Who should skip this four-pack?
Skip it if you do not own a compatible MA-25 model, if you only want genuine Medify Air replacement filters, or if you need a washable filter. It is also worth skipping when current seller details do not clearly show the package count or return policy.
The Bottom Line
The Midiex 4-Pack MA25 Replacement Filter is a practical option for Medify Air MA-25 owners who want a multi-pack aftermarket replacement with H13 HEPA media and activated carbon. Its strongest points are the four-piece quantity, straightforward MA-25 fit claim, and 3-in-1 filtration design, while its main limitation is the lack of OEM manufacturer backing. Buy it when value and spare filters matter most, but choose the genuine Medify Air set if verified OEM construction and support are your priority.
Ready to Buy?
Check the latest price, seller details, package count, and compatibility before you decide.
