Owners of Xiaomi air purifiers often face a dilemma: the original filter is expensive, and Chinese counterparts are frightening with its variety and low price. At first glance, all consumables seem the same - white corrugated paper in a cardboard box, but it is the internal filling that determines whether the device will save your respiratory system or just drive dust around the room.
The differences lie not only in the degree of cleaning, but also in compatibility with specific models of cleaners, such as the Mi Air Purifier 2S, 3H or 4 Pro. Wrong choice can lead to reduced cleaning efficiency, increased noise or even engine failure due to increased aerodynamic drag.
In this article, we will discuss in detail what the types of filters differ, how to recognize the quality of the filter. HEPA-Understanding these nuances will help you save your budget and ensure that the house is really clean air, not just the illusion of working the device.
Key Filtration Types in Xiaomi Ecosystem
Most of Xiaomi's cleaners use a multi-layer cleaning system, where each layer is responsible for its own type of contamination. HEPA-High Efficiency Particulate Air, which traps solid particles, but the density and thickness of this layer can vary depending on the device series.
The second critical component is the coal layer, which absorbs gases, odors and volatile organic compounds, and in cheap analogues, this layer is often replaced by a thin mesh of carbon chips that quickly saturates and stops working, while the originals use high-density granular activated carbon.
- 🌿 Basic (Green): Designed to remove large dust, animal hair and pollen, has a minimum content of coal.
- 🏭 Antiformaldehyde (Blue): Contains a reinforced catalyst layer to combat toxic fumes from furniture and building materials.
- 🦠 Antibacterial (Purple/Gray): Equipped with a special coating that suppresses the reproduction of bacteria and viruses on the surface of the filter.
⚠️ Attention: Use of low density filters HEPA (lower-grade H12) In models with a powerful engine (for example, the Pro series) will lead to the seepage of fine dust PM2.5 back-in.
Technical characteristics and classes of cleaning
When choosing consumables, it is critical to pay attention to the filtering class. For urban apartments, the de facto standard has become the H13 class, which traps at least 99.95% of particles up to 0.3 microns in size. Cheaper E11 or H11 models miss a significant amount of fine dust, which negates the purchase of a purifier.
Another option is CADR, which is directly dependent on the filter capacity, and if you put a filter that's too dense in a weak cleaner, it'll run to the limit, creating noise, and vice versa, the filter that's too loose in the powerful Mi Air Purifier 4 just won't have time to clear the air volume.
Special attention should be paid to the tightness of the design. A quality filter has rubber or foam seals around the perimeter, which prevents the leakage of untreated air bypassing the filter element.
Comparison of original filters and quality analogues
The market is full of copies that are visually almost indistinguishable from the original. But the difference in quality is huge. Xiaomi's original filters undergo strict quality control and use antibacterial coating, which actually works, unlike simple sprays on copies.
Below is a table showing the key differences that will help you make a buying decision.
| Characteristics | Original Xiaomi | Quality analogue | Cheap copy |
|---|---|---|---|
| HEPA class | H13 (99.95%) | H12-H13 | E10-E11 |
| Coal layer | Granulated, thick | Mixed | Thin mesh/powder |
| NFC/RFID chip | Aye (automatic reset) | Often eat (emulation) | No (manual reset needed) |
| Smells at work | Absent. | Possible in the first hours. | A sharp chemical smell |
The important difference is the presence of a chip. NFC or RFID-In the original models, this chip automatically resets the filter resource timer in the Mi Home app when installed. Analogs may require manual reset via menus, and some cheap copies are not detected at all by the system, causing the indicator to burn red constantly.
Specific models: 2S, 3H, 4, Pro and Lite
Xiaomi’s cleaner line is heterogeneous, and filters are not universal. For example, the cylindrical filters for the Mi Air Purifier 2/2S/3/3H models are the same diameter, but may differ in height and wall thickness. The two-filter will rank in the three, but the efficiency will fall due to the smaller filtration area.
The 4 and 4 Pro series have moved to more massive, longer-lasting cylindrical filters that are physically incompatible with older models because of their size, while the Lite series uses flat rectangular filters that can’t be confused with cylindrical filters at all.
- 📏 Size 200x200x280 Standard for Mi Air Purifier 2, 2S, 3, 3H, Pro.
- 📏 Size 200x200x295 Upgraded version for Mi Air Purifier 4 and 4 Lite.
- 📏 Size 230x230x380 Powerful filters for Mi Air Purifier 4 Pro and H3.
⚠️ Warning: Do not force the filter to the wrong size, this can damage the compartment cover or disrupt the air duct tightness, which will cause the engine to overheat.
When buying, always check the labeling on the package. For models with the prefix Pro, the thickness of the filter walls is critical, since the fan creates high pressure, and the thin cardboard can simply collapse inwards.
☑️ Checking compatibility before buying
Operational resource and signs of wear
The manufacturer claims the life of the filter from 6 to 12 months depending on the model and air pollution. However, in real conditions of the metropolis with its dust and exhaust gases, the resource can run out faster, after 3-4 months of active operation.
The main indicator of the need to replace the filter is the change in color from white to gray or brown, and the appearance of a persistent sour smell when the purifier is turned on, which indicates that the carbon layer is saturated and has begun to release accumulated substances back.
Mi Home calculates the rest of the resource algorithmically based on the time and speed of the fan, but it doesn't physically feel the air pollution, so if you live near a factory or construction site, focus on the visual state, not the percentages on the phone.
Frequent questions and misconceptions
There are many myths surrounding filters, such as the idea that they can be washed and reused. HEPA-filters: water destroys the structure of the fibers, and after drying, the filter turns into a useless lattice mass.
Another misconception is that there are "eternal" electrostatic filters, which Xiaomi doesn't have, which use mechanical filtration, and replacing consumables is an inevitable maintenance expense that saves on health.
Users also often ask if filters from other brands (such as Philips or IKEA) can be used in Xiaomi cleaners, which may not fit physically in size or shape, and the software cleaner may not work without a native chip, although there are ways to bypass this protection.