Meowant Air Purifier Filter Replacement: When and How to Change PA16 Filters
If you are looking for a Meowant air purifier filter replacement, the filters in question belong to the Meowant PA16 Pet Air Purifier (MW-PA16). Replace the HEPA and carbon filters every 3–6 months and the washable pre-filters about every 3 months, sooner in dusty rooms or homes with several shedding pets. The PA16 also tracks filter life and flashes a red reminder when it is time to change them.
This guide covers what is inside a PA16 filter set, how often to clean and replace each layer, the step-by-step swap from the user manual, and how these filters differ from the deodorizer refills used in Meowant litter boxes.
Which Meowant filters does this guide cover?
The HEPA and activated carbon filters covered here are made for the PA16 air purifier. They are not litter box parts. Meowant's self-cleaning litter boxes control odor with a sealed waste bin and a deodorizer, not with a replaceable carbon filter, so if your question is about a litter box, skip to the litter box section below.
The PA16 holds two filter sets, one behind the front cover and one behind the rear cover. The Meowant PA16 Replacement Filters pack contains enough for both sides:
- 2 × washable electrostatic cotton pre-filters. The outer layer that traps pet hair, lint and larger dust before it reaches the main filter.
- 2 × H13 True HEPA layers. The fine particle layer for dust, pollen and pet dander.
- 2 × honeycomb activated carbon composite layers. The odor layer, which helps reduce pet odors, cooking smells and smoke.
Pre-filters are also sold on their own as Meowant PA16 Replacement Pre-Filters, which are designed only for the PA16.
The HEPA and carbon layers are built into one combined filter and cannot be separated, so they are always replaced together. Only the pre-filter comes off on its own for cleaning.
How often to replace PA16 filters
| Layer | Clean | Replace |
|---|---|---|
| Electrostatic cotton pre-filter | When hair or dust is visible or the unit gets louder; the manual suggests about every 2 weeks | Every 3 months under normal conditions; every 2 months in homes with poor air quality |
| H13 True HEPA filter | Vacuum off surface dust only; never rinse | Every 3–6 months, depending on air quality and usage |
| Honeycomb activated carbon composite filter | Keep dry; do not rinse | Every 3–6 months, depending on air quality and usage |
Replacement intervals come from Meowant's filter and pre-filter product pages; cleaning guidance comes from the MW-PA16 user manual.
What the filter reminder measures
The PA16 counts running time. When the filters reach their service life of 2,000 hours, the Check / Reset Filter button flashes red. Pressing that button once while the purifier is on shows the remaining filter life for 6 seconds, so you can check ahead instead of waiting for the warning.
Because the reminder is based on hours, it does not know how dusty your room is or how many pets you have. If you run the purifier around the clock, 2,000 hours is a little under three months. If you only run it at night, the reminder will take much longer to appear, even though the filters may already be loaded.
When to change filters before the reminder
The manual notes that heavily polluted or dusty environments clog filters faster, and that filters should then be cleaned and replaced more often. In a pet home, plan for the shorter end of the 3–6 month range when:
- Several cats or dogs share the room, or it is peak shedding season.
- The purifier sits near a litter box, a pet bed or a kitchen.
- Airflow stays weak even after you clean the pre-filter.
- A stale or musty smell comes from the unit itself.
- Pet odors return to the room faster than they used to, even though your litter routine has not changed.
One thing the display cannot tell you: the PA16's dust sensor measures airborne particles, not gases. A green air quality light means particle levels are low. It does not mean the carbon layer is still absorbing odor well. Your nose and the calendar are the better guides for the carbon filter. For more on how pet hair and dander load filters over time, see what pet hair and dander do to filter lifespan.
How to replace the PA16 filters step by step
- Power down. Press the power button to turn the purifier off, then unplug it. Always unplug before opening the covers.
- Remove the covers and old filters. Pull the sides of the front and rear covers to remove them, then take out both filter sets.
- Unwrap the new filters. Remove all plastic wrap from the new filters. A filter left in its wrap blocks airflow.
- Insert the new filters. Place one set in the front and one in the rear, with the pull tabs facing outward.
- Refit the covers. Align each cover with the bottom slots, attach it and press to secure it in place.
- Reset the filter life. Plug in, press the power button once, then press and hold the Check / Reset Filter button for 6 seconds until you hear three beeps.
Only use replacement filters recommended by Meowant. The manual advises against filters that are not recommended by the manufacturer.
How to clean the pre-filter and HEPA filter
Cleaning the pre-filter between replacements keeps airflow up and protects the main filter. The manual's steps are:
- Turn off and unplug the purifier, open the front and rear covers and remove the filters.
- Vacuum dust from the main unit and from the HEPA filter. Do not rinse or soak the HEPA filter.
- Gently pull the pre-filter away from the HEPA filter and vacuum it. If it is heavily soiled, rinse it with water and let it air dry completely before refitting.
- Reattach the pre-filters to the HEPA filters, place both sets back with the pull tabs facing outward, and secure the covers.
Do not let water touch the HEPA or carbon layers, and never refit a pre-filter that is still damp. The manual also warns that high humidity can let mildew grow on the filters, so a musty smell from the unit is a reason to check them. During shedding season, our guide to checking and cleaning a purifier's intake and pre-filter covers what to look for.
Every 6 months, or more often in dusty or smoky homes, clean the dust sensor with a lightly dampened cotton swab and dry it with a dry swab. A dirty sensor can leave the air quality light stuck on red even when the air is clean.
Troubleshooting after a filter change
- Airflow is weak. Check that the plastic wrap is off, the pull tabs face outward and the covers are seated. A pre-filter clogged with hair also reduces airflow.
- The unit is noisy. Make sure the filters and covers are fully in place and the purifier stands on a hard, flat, level surface. Remove the covers and filters to check for any foreign object inside.
- The reminder is still flashing. Hold the Check / Reset Filter button for the full 6 seconds, until three beeps, with the purifier switched on.
- The room still smells. Close doors and windows while the purifier runs, leave at least 8 inches (20 cm) of clearance around it, and remember that a large room takes longer to clean. If odor persists, the source may be the litter box rather than the filter.
Placement matters as much as the filters themselves. See where to place an air purifier for everyday use and, if the unit has started to rattle or whistle, what unusual purifier noises mean in a pet home.
Air purifier filters vs litter box deodorizers
An air purifier treats the air in the room. A litter box deodorizer works at the source, inside or right next to the box. They are separate products with separate refill schedules:
- Automatic litter boxes. Meowant's self-cleaning boxes rely on a sealed or enclosed waste bin plus a deodorizer. The MeoWant Pet Odor Eliminator Gel is listed as compatible with the SC01, SC02 and LB02. Deodorizer Boxes for the SC09 and SC10 are sold separately on the Smart Litter Box Accessories page.
- Stainless steel box. The LB02, a manual box, has a spot in its top cover for a deodorizer bag or an activated carbon filter.
- Standalone deodorizer. The Meowant OR01 Smart Odor Remover sits near the box, uses a motion sensor to release a light fragrance when your cat enters and works with Meowant deodorizing gel.
None of these use a HEPA filter, and none of them replace the PA16's filters. If the litter area smells, start with the litter routine: waste bin, litter freshness and placement. Then let the purifier handle what remains in the air. Our guide to keeping a litter box from smelling walks through that routine, and dust vs odor in filter maintenance explains why particles and smells need different fixes.
When odor is a health signal, not a filter problem
Fresh filters cannot fix a litter box your cat has stopped using properly. The Cornell Feline Health Center notes that house soiling is often linked to how a cat perceives its litter area, so a strong, lingering smell can be part of the problem. Urine that smells unusually strong, more frequent trips or straining can also point to a medical issue. The AVMA warns that feline lower urinary tract disease can become an emergency, especially in male cats, so contact your veterinarian promptly if you see these signs.
For a wider look at managing dander, hair and odor in a pet home, see our guide to air purifiers for pet homes.
Disclaimer: This article is for informational purposes only and does not constitute professional veterinary advice. If your cat exhibits changes in elimination habits, such as increased frequency or straining, consult a qualified veterinarian. Always follow the MW-PA16 user manual when servicing the purifier.
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