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Coway Airmega 300 replacement filter
The Coway Airmega 300 takes the Airmega 300•300S Max2 Filter Set. It costs $99 at Coway's store and lasts up to 12 months, which works out to about $99 a year in filters.
The numbers
| Filter | Airmega 300•300S Max2 Filter Set |
|---|---|
| Price at Coway's store | $99 |
| Lasts | up to 12 months |
| Filters per year | $99 |
| Electricity per year (est.) | $34 |
| Total running cost per year (est.) | $133 |
| Five years of filters | $495, against $549 for the purifier |
Filter price and replacement schedule are Coway's own, checked 2026-10-05. Yearly figures are our calculation from them; electricity assumes 24/7 use at a typical fan speed and $0.17/kWh.
How it compares
Its yearly filter cost ranks 15 of 23 purifiers we track (1 is cheapest). Against other purifiers for medium rooms:
| Purifier | Filter | Per year |
|---|---|---|
| Blueair Blue Pure 411i+ Max | $29.99 | $30 |
| Coway Airmega Mighty AP-1512HH | $59.79 | $60 |
| Coway Airmega 200M | $59.79 | $60 |
| Coway Airmega Mighty2 AP-1512N | $69.99 | $70 |
| Coway Airmega 250 | $89 | $89 |
| Coway Airmega 300 | $99 | $99 |
| Levoit Vital 200S-P | $49.99 | $100 |
| Levoit Core 400S-P | $49.99 | $100 |
| Blueair DustMagnet 5440i | $54.99 | $110 |
Other filters Coway sells for the Airmega 300
Besides the standard filter, Coway lists this for the Airmega 300. The type is Coway's own description of what the filter is for; we have not tested any of them, and the purifier's published CADR is for its standard filter.
| Type | Filter | Price | vs. standard | Why it's listed for this purifier | |
|---|---|---|---|---|---|
| Pre-filter | Coway Airmega 300 Pre-Filter | $35 checked 2026-10-11 | — | Coway's listing names it: “Airmega 300 Pre-Filter” (source, confirmed 2026-10-11) |
Prices are from Coway's store. The yearly cost above uses the standard filter; a dearer filter replaced on the same schedule raises it in proportion. A pre-filter is the outer layer that catches hair and large dust before the main filter.
When to replace it
- Follow the purifier's filter indicator rather than the calendar: it tracks actual use, and the brand's schedule is a maximum under normal conditions.
- Wildfire smoke, heavy cooking, pets and dusty rooms shorten a filter's life. A filter that looks grey or carries a smell is due even if the light hasn't come on.
- Third-party filters are cheaper, but the brand's performance figures only apply with its own filter, and on some purifiers the filter-life tracking only works with genuine ones.
See the full specs for the Coway Airmega 300, the cheapest purifiers to run, or every purifier's filter cost.