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Replacing the filter in an older Honeywell air purifier can be confusing because several similar model and part numbers are still in use. The Ontheone 50250-S HEPA Filter Replacement Set gives you one HEPA filter plus two activated carbon pre-filters in a package designed for specific Honeywell models. Its strongest points are its listed MERV 17 filtration, 99.97% particle-filtration claim, and included odor-control pre-filters, but you need to confirm your purifier model before ordering. This review explains the fit, filtration, maintenance needs, installation process, and limitations so you can decide whether this aftermarket replacement set makes sense for your purifier.
Quick Verdict
Rating: 8/10, Recommended with caveats
Best For: Owners of compatible Honeywell 24000, 24500, 50250-S, or 52500 air purifiers who want a HEPA and carbon replacement set in one package.
Bottom Line: You get one HEPA filter and two carbon pre-filters with useful particle and odor filtration in a single replacement kit. The main tradeoff is compatibility, so you should verify the model number on your purifier instead of buying by appearance alone.
Key Specifications
| Specification | Detail |
|---|---|
| Brand | Ontheone |
| Model | 50250-S |
| Product Type | Replacement HEPA filter and carbon pre-filter set |
| Package Contents | 1 HEPA filter + 2 activated carbon pre-filters |
| MERV Rating | 17, as listed for this replacement filter |
| Particle Filtration | Listed to capture 99.97% of airborne particles |
| Filter Construction | Pleated HEPA filter with activated carbon pre-filters |
| Listed Dimensions | 14.2 × 14.2 × 9.9 inches |
| Listed Weight | 2.2 kg |
| Compatible Models | Honeywell 24000, 24500, 50250-S, and 52500 |
| Replacement Reference | Compared with part number 24000 |
| HEPA Replacement Interval | Up to 1 year under normal conditions |
| Carbon Pre-Filter Interval | About every 3 to 4 months, depending on use and environment |
What Is the Ontheone 50250-S Filter Set?
The Ontheone 50250-S is an aftermarket replacement filtration set for several Honeywell air cleaner models. Instead of giving you only the main HEPA element, the package combines one pleated HEPA filter with two activated carbon pre-filters, which means you have both the main particle filter and replacement odor-control layers in the same kit.
The HEPA portion is listed with a MERV 17 rating and a claim of capturing 99.97% of airborne particles. The carbon pre-filters serve a different purpose. They sit ahead of the main filter and help reduce household odors from sources such as pets, cooking, and smoke while also catching larger debris before it reaches the HEPA media.
This set is most useful when your purifier matches one of the listed Honeywell models and you want an all-in-one aftermarket replacement rather than buying the main filter and pre-filters separately.
Before You Buy: Check the model number on your air purifier’s label before ordering. Similar-looking Honeywell purifiers can use different replacement-filter arrangements, so matching the model number is more reliable than comparing the filter by shape alone.
Who Should Buy It?
Best For
- You own a listed Honeywell 24000, 24500, 50250-S, or 52500 purifier.
- You want HEPA particle filtration plus activated carbon odor control.
- You prefer a package that includes two replacement carbon pre-filters with the main filter.
Skip If
- Your purifier model is not specifically listed as compatible.
- You want only an original Honeywell-branded replacement filter.
- You need a washable filter rather than a replaceable HEPA and carbon setup.
Filtration Performance
The main reason to consider this replacement kit is its combination of particle and odor filtration. The HEPA filter is listed as capturing 99.97% of airborne particles and carries a listed MERV rating of 17. That makes particle removal the central job of the main filter, including common airborne material such as dust and pet dander.
A replacement filter cannot make the purifier perform beyond the capabilities of the purifier itself. Airflow, room conditions, filter loading, purifier placement, and operating time all affect how much airborne material passes through the filter. For that reason, the 99.97% figure should be understood as a filtration-media claim rather than a promise that 99.97% of every pollutant in your room will disappear.
Activated Carbon Odor Control
The two included carbon pre-filters add a useful second layer. Their main role is reducing odors from everyday sources such as pets, cooking, and smoke before air reaches the HEPA element. This is different from the HEPA filter’s particle-focused job.
The carbon layers are consumable parts. The product guidance calls for replacement about every 3 to 4 months, although a home with heavier cooking odors, pets, smoke, or long purifier operating hours may load the carbon sooner.
Carbon filtration can help with normal household odors, but you should not treat an air purifier as a substitute for fixing an odor source, controlling moisture, maintaining ventilation, or dealing with a serious indoor-air problem.
Fit and Compatibility
The Ontheone set is listed for Honeywell 24000, 24500, 50250-S, and 52500 air cleaners and references replacement part number 24000. This is one of the most important details to check because Honeywell’s 50000-series purifiers have existed in different configurations over the years.
Before buying, find the model label on your purifier and compare it with the seller’s compatibility information. If your purifier manual specifies a different filter arrangement or replacement number, follow the manual rather than assuming this filter will fit.
Pro Tip: Take a photo of your purifier’s model label and existing filter before ordering. It gives you two quick references when checking the model number, size, and filter arrangement.
Installation and Setup
Filter replacement on compatible Honeywell units does not require complicated tools, but you should work with the purifier unplugged. Honeywell’s instructions for this style of purifier call for switching the unit off, disconnecting it from the wall outlet, opening the base, removing the existing filter assembly, and reinstalling the replacement assembly securely.
- Turn the purifier off and unplug it. Do not service the filter compartment while the purifier is connected to power.
- Open the filter compartment. Follow the instructions for your exact Honeywell model rather than forcing the housing.
- Remove the old HEPA and carbon components. Note how the existing pre-filter is positioned around the main filter.
- Install the replacement components. Fit the new carbon pre-filter and HEPA filter in the same required orientation.
- Close the purifier securely. Make sure the base or cover is properly locked before returning the unit upright.
- Reconnect power and reset the filter indicator if required. Follow your purifier manual for the correct reset procedure.
Correct installation matters because gaps or an incorrectly positioned pre-filter can allow air to bypass part of the intended filtration path.
Replacement and Maintenance
The Ontheone HEPA filter is listed to last up to one year under normal conditions. The two carbon pre-filters have a much shorter suggested service interval of about 3 to 4 months. These are general intervals, not fixed deadlines.
Your actual replacement schedule can change with purifier operating time and indoor conditions. Reduced airflow, heavier visible loading, or returning household odors can indicate that a filter deserves inspection even if you have not reached the suggested interval.
Avoid washing a replacement HEPA or carbon filter unless the instructions for that exact filter specifically state that it is washable. Honeywell guidance for comparable 50250-series HEPA and carbon filter arrangements warns that washing the filters can damage them.
How It Performs in Real Use
In a Home With Pets
Pet-owning households can make use of both stages of the set. The HEPA media handles airborne particles such as dander, while the carbon pre-filter is intended to reduce common pet-related odors. You still need regular floor and surface cleaning because an air purifier only captures material that reaches its airflow path.
Near Cooking Areas
The carbon pre-filter can help reduce routine cooking odors that circulate into nearby rooms. For smoke, grease, steam, or strong cooking emissions, continue using your kitchen exhaust and normal ventilation because the purifier is an additional filtration tool, not a replacement for source ventilation.
During Dust or Allergen Season
The HEPA stage is the more relevant part of the kit when airborne dust, pollen, or pet dander is your concern. Running the purifier consistently and keeping doors and windows managed can help more room air pass through the filter, although the final result still depends on the purifier’s airflow and room conditions.
For Long-Term Ownership
The package design is practical because you receive two carbon pre-filters with one main HEPA filter. Since the carbon media normally needs replacement more often, having a second pre-filter available can reduce the need to immediately purchase another carbon filter between HEPA changes.
Pros and Cons
Pros
- Includes one HEPA filter and two carbon pre-filters.
- Listed MERV 17 filtration with a 99.97% airborne-particle filtration claim.
- Carbon pre-filters target common pet, cooking, and smoke odors.
- Designed for several clearly identified Honeywell purifier models.
- Two included pre-filters match the fact that carbon media usually needs replacement more often than the HEPA filter.
Cons
- Compatibility is limited, so you need to confirm your purifier model carefully.
- Carbon pre-filters require replacement every few months under typical guidance.
- This is an aftermarket Ontheone set, not an original Honeywell-branded filter.
Is It Worth the Price?
The value of this filter set comes mainly from getting the main HEPA element and two carbon pre-filters together. That package format is useful because the carbon layers are normally replaced more frequently than the HEPA component, so the second pre-filter can be used later instead of immediately purchasing another one.
It is worth considering if you own one of the listed Honeywell models and want an aftermarket replacement with both particle and odor filtration. It is less appealing if you prefer original manufacturer filters or if your purifier uses a different Honeywell replacement-filter configuration.
Because replacement filters are a recurring expense, compare the current package contents and compatibility rather than choosing only by the lowest advertised price.
How It Compares to Alternatives
One alternative is to use the replacement filters specified directly in the manual for your exact Honeywell purifier. Older Honeywell 50250 documentation references HEPA part number 24000 and carbon pre-filter 38002, while documentation for some later 50250-series configurations references other Honeywell filter arrangements. That makes your purifier’s own manual the safest starting point when comparing an OEM option with this Ontheone set.
You can also find other aftermarket 50250-S replacement kits that bundle a main filter with carbon pre-filters. The Ontheone package makes the most sense when its exact compatibility list matches your purifier and you value having two carbon pre-filters included.
Frequently Asked Questions
Which Honeywell models are compatible with the Ontheone 50250-S filter?
The set is listed as compatible with Honeywell 24000, 24500, 50250-S, and 52500 air cleaners and references part number 24000. Check the model label and your purifier manual before ordering because similar Honeywell units can use different filter configurations.
What comes in the package?
The package contains one HEPA filter and two activated carbon pre-filters. The extra carbon pre-filter is useful because the carbon layer normally requires replacement more often than the main HEPA filter.
How often should you replace the Ontheone HEPA filter?
The HEPA filter is listed to last up to one year under normal conditions. Heavy use or a dusty environment can change the practical service interval, so inspect the filter and watch for reduced airflow rather than relying only on the calendar.
How often should you replace the carbon pre-filter?
The listed replacement interval is about every 3 to 4 months, depending on use and your environment. Homes with pets, smoke, frequent cooking odors, or long purifier operating hours may need more frequent inspection.
Can you wash and reuse these filters?
You should not wash the HEPA or carbon components unless the instructions for your exact replacement filter explicitly allow it. Honeywell guidance for comparable 50250-series filter setups states that washing the HEPA and carbon filters can damage them.
Does the filter help with pet and cooking odors?
Yes, the activated carbon pre-filters are intended to reduce common household odors from pets, cooking, and smoke. Results depend on odor strength, airflow, filter condition, and whether the original odor source is also being controlled.
Does it remove allergens from the air?
The HEPA filter is listed to capture 99.97% of airborne particles and can capture particles such as pet dander and pollen that pass through the purifier. That figure describes filter performance and should not be treated as a guarantee that the purifier will remove 99.97% of all allergens present throughout a room.
Who should skip the Ontheone 50250-S replacement set?
Skip it if your purifier model is not on the compatibility list or your manual calls for a different filter configuration. You may also prefer an alternative if you specifically want an original Honeywell-branded replacement rather than an aftermarket filter set.
The Bottom Line
The Ontheone 50250-S is a practical replacement option if your Honeywell purifier is specifically listed as compatible and you want one HEPA filter plus two carbon pre-filters in a single package. Its main strengths are the listed MERV 17 filtration, 99.97% particle-filtration claim, and added odor-control layers, while its main limitation is the need to verify fit carefully before buying.
If your model matches and you are comfortable using an aftermarket replacement, the set earns our 8/10, Recommended with caveats verdict. If your purifier uses another filter configuration or you only want an OEM Honeywell replacement, check your manual and compare the appropriate alternative first.
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