How Do You Clean an Air Purifier Filter? Which Part the Manufacturers Say You Can Wash

Brand by brand, in each manufacturer’s own words: the one part you can wash, the parts you must replace, and what a year of filters costs where the numbers are published.

Air purifiers on Amazon.inFour HEPA air purifiers, with the Amazon.in price on 8 Nov 2026. Examples, not a ranking.

Honeywell Air Purifier 3-in-1For home and office, pre-filter, H13 HEPA₹5,000Amazon, 8 Nov 2026★ 4.0Check price ↗LEVOIT Core 300 Air PurifierH13 True HEPA filter, 24 dB filtration system₹9,800Amazon, 8 Nov 2026★ 4.4Check price ↗Coway Airmega 150 AP-1019CAir purifier for home and office₹15,000Amazon, 8 Nov 2026★ 4.7Check price ↗WINIX 5500-2 Air PurifierTrue HEPA, carbon filter, air quality monitor, auto mode₹16,000Amazon, 8 Nov 2026★ 4.5Check price ↗

See all air purifiers on Amazon.in ↗

Before you put an air purifier filter under the tap, find out which filter it is. We read the maintenance instructions Philips, Coway, Xiaomi and Dyson publish for purifiers sold in India. All four treat the HEPA and carbon stages as replace-only; the only part any of them describes as washable is a separate pre-filter. Havells and Blue Star name their filter stages but publish no wash-or-replace instruction on the pages we checked.

The short answer. On the four brands that publish an answer, the only washable part is a separate pre-filter, where the purifier has one. Havells names a pre-filter but publishes no wash instruction on the pages we read, so we cannot tell a Havells owner to wash it. Coway publishes the most complete method we found: wash it, lightly wipe off the water, then hang it on the front of the running unit to dry. The HEPA and carbon stages are replace-only on those four brands. No brand we checked publishes a drying time, and none ties cleaning or replacement to an AQI number.

Which air purifier filter parts can you clean? What each manufacturer publishes

The purifiers we checked name a pre-filter, a HEPA stage and a carbon stage, though not every model names all three and some combine HEPA and carbon into one part. Blue Star’s pages also list an ionizer or UV on some models. This is what each manufacturer publishes for its own products, not a rule of physics.

Philips is the plainest: “You can clean or wash the pre-filter (indicated as C in the image below). The other filters (indicated as A and B in the image below) cannot be washed: they need to be replaced.” Philips does not separate carbon from HEPA; both are “the other filters”.

Coway sells the AirMega 150’s “Anti-Flu True HEPA Filter” and “Patented Urethane Carbon Filter” as one replace-only set. The AirMega 250 reads “Washable Pre-Filter + Max2 Filter”, the Max2 being carbon and HEPA fused into one cartridge.

Xiaomi’s Mijia Smart Air Purifier 4 Compact page describes one action: “Replace Your Filter in Seconds. Simply twist, pull and replace.” It has no explicit “do not wash” sentence; the maintenance flow it describes is replacement. The same page does not call this a conventional HEPA filter but a “High Efficiency Filter” using “Electrostatic and mechanical filtration”. The Mijia Smart Air Purifier 6 page follows the same replace-only pattern with no wash step; this page has no filter naming from it.

Dyson’s FAQ on dyson.in says: “Instead of washing, the device features an indicator to remind you when it’s time to replace the filter”, and “cleaning Dyson filters with water isn’t necessary.”

Havells and Blue Star. Havells’s Breathe AP 310 and Meditate AP 400 pages list “Pre filter, Carbon Filter, HEPA Filter (H13)” and a “Filter Life Indicator”, with no wash, vacuum or cleaning language on either page, and its manuals index of 184 documents holds no air purifier manual. The four Blue Star pages list HEPA and Active Carbon and a “filter change alert” but not which stage is washable, and its brochure download page would not load for us.

How to wash the pre-filter: Coway’s method, step by step

Coway’s AirMega 150 page gives the only complete wash-and-dry instruction we found, word for word: “When the notification lamp of the filter indicator lights up, pull it upward and wash the Pre-filter. After washing, lightly wipe off the water and then hang it on the front cover of the main unit while it is in operation for quick drying!”

In the order you do it:

1. Wait for the filter indicator’s notification lamp to light up.
2. “Pull it upward”, in Coway’s words.
3. Wash the pre-filter.
4. Lightly wipe off the water.
5. Hang it on the front cover of the main unit while the purifier is running, so it dries quickly.

Step 5 is the detail: the pre-filter dries on the running machine, not left wet or set aside. That is a method, not a duration. Coway gives no minutes or hours, and no other brand we checked publishes a drying time. We are not inventing one.

Philips’s shorter instruction has a scope attached. For its Air Purifier & dehumidifier family only, Philips says to “clean the pre-filter under the tap or with a vacuum cleaner”, while the main filter “is not washable nor reusable, please replace it when the replacement alert appears on the screen.” For its standalone purifiers and 2-in-1 purifier and humidifier units, the same FAQ says only that the pre-filter can be cleaned or washed.

Dyson’s three numbers, side by side

Dyson publishes three figures on dyson.in: two about the Big+Quiet (BP02), and one general cleaning answer in its purifier FAQ that names no model.

The first two disagree, and both are Dyson’s own words about the same purifier. Only the 12-month figure states a usage basis. We cannot reconcile them, because Dyson has not. The third is not a Big+Quiet figure: the passage we read names no model and does not say what that cleaning involves, and we have not guessed.

What a year of replacement filters costs

We only annualise where a manufacturer publishes a filter life and a replacement price for the same filter, with no conflict between its own figures. On this page, two Coway models clear that bar.

The AirMega 150 working: 8,500 hours at 12 hours a day is 708 days, about 1.94 years, so ₹4,999 over that is about ₹2,576 a year.

Xiaomi gives the Mijia Smart Air Purifier 6 filter “approximately 1 year, depending on usage, air quality, and operating conditions”, but we found no spare-filter price on mi.com/in. Dyson does publish a life and a price for the Big+Quiet, but we do not annualise them, for two reasons. Its life figures conflict (up to 5 years against every 12 months, above). And they are about different parts: the ₹6,990 price (as of September 2026, listed as currently out of stock) is for the “Activated Carbon Filter”, while the 12-month advice is about the “HEPA+Carbon filter”. Havells and Blue Star publish neither a filter life nor a spare-filter price on the pages we read. Still choosing a machine? Our humidifier vs purifier comparison covers that decision.

When to clean or replace: indicators and published intervals, not the AQI

Every brand we checked names a replacement indicator on the unit or in an app:

• Coway: a notification lamp on the unit lights up.
• Xiaomi: app reminders. “Get timely replacement reminders through the Xiaomi Home app” (4 Compact); “Smart filter life monitoring notifies you when replacement is recommended” (6).
• Dyson: filter life on the unit’s LCD screen.
• Philips: a replacement alert on the screen (its Air Purifier & dehumidifier instructions).
• Havells and Blue Star: a “Filter Life Indicator” and a “filter change alert”, with no statement of what triggers it.

Some also publish a time figure. Dyson says every 12 months for the Big+Quiet’s HEPA+Carbon filter, and every two to three months for cleaning in its general FAQ. Coway gives 1 year for the AirMega 250’s Max2 filter and 8,500 hours at 12 hours a day for the AirMega 150’s set. Xiaomi gives approximately 1 year for the Mijia Smart Air Purifier 6. What none of them publishes is a cleaning or replacement interval tied to an AQI or PM2.5 number. Dyson mentions “high pollution” but gives no figure. For your own yardstick, CPCB’s national AQI bands are the official Indian scale:

This table describes the air, not your filter. No manufacturer we checked converts it into a schedule, so we have not either. For another cleaning job around the home, see our ceiling fan cleaning guide.

What we could not verify

• A drying time for a washed pre-filter. No brand we checked publishes one.
• A cleaning frequency from any brand other than Dyson’s general two to three months, and no interval linked to AQI or PM2.5 from any brand.
• What Dyson’s “cleaning” consists of. The passage we read does not say.
• Havells and Blue Star: which stage is washable, filter life, spare-filter price, and what triggers their indicators.
• Xiaomi: a spare-filter price for either model, and a filter life for the 4 Compact.
• Honeywell: no manufacturer-owned page was found for its purifiers sold in India. Sharp: its India site returned no readable product content.
• Whether washing or vacuuming a filter yourself affects your warranty. Not checked: we did not look for warranty terms on these pages, so this page has no manufacturer statement either way.
• Vacuuming a HEPA stage. Nobody we checked publishes it as a method.

How we source and date these checks is set out at how we research.