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Ioniser vs HEPA filter

Updated: 21 October 2026

You are comparing an ioniser vs HEPA because a listing has used both words, and you want to know whether dust will sit on the dresser or end up in a filter. In the seven machines kept in the [ioniser comparison](/hub/cooling/ionizer), those are different fates, not two scores on one ladder. A filter-free plug charges particles so they settle. A HEPA-style filter is there to hold them. A hybrid charges them and then holds them. By the end you should know which fate you are buying. Peter F. used the amazon.co.uk listings in this set, not a lab. Affiliate links are the Amazon URLs on the comparison. A qualifying purchase can earn a commission at no extra cost to you.

You are comparing an ioniser vs HEPA because a listing has used both words, and you want to know whether dust will sit on the dresser or end up in a filter.

Our top picks

PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack

Best overall

PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack
5.5/10about £10.99
View offer
Winix Winix 5500-2

Rank 2

Winix Winix 5500-2
9.1/10about £159
View offer
MELEDEN MELEDEN GL2103 desktop HEPA ioniser

Best value

MELEDEN MELEDEN GL2103 desktop HEPA ioniser
7.5/10about £19.99
View offer
On this page
  1. 1.What each one does to a particle
  2. 2.What that means for pollen, dust and smoke smell
  3. 3.The hybrids, and the machine that was removed
  4. 4.When to pick which

What each one does to a particle

A negative-ion plug charges a particle so it leaves the air onto a wall, a table or the floor. Which? says that about a different plug-in, the Puripod. Tech Advisor says ionic purifiers drop dust, leave pollen in circulation and do not remove gases. The PTYcrazy at about £10.99 is that column: no filter, no fan, no CADR. You dust. That is the method. Ideal Home’s 99.97% at 0.3 microns is that magazine’s wording, not BS EN 1822, and a listing bullet is not a certificate. The MELEDEN claims 0.3 micron and about 10 m². The JINPUS table says 2.5 micrometres and a bullet says 99.97% of PM2.5. Blueair’s HEPASilent is a filter plus a charge so particles cling to the media. Winix puts PlasmaWave after HEPA and carbon, and you can switch it off. Price bands are in the ioniser buying guide.

What that means for pollen, dust and smoke smell

If pollen has to leave inside a filter, the PTYcrazy is the wrong tool. The MELEDEN is the small filter, about 10 m², and the wall charger is not included. The Mini is the mains version if you use 8.6 m² in 30 minutes, not the 47.4 m² title. Only the Winix pair states a CADR, 390 m³/h, and that is not the same as 99 m², 20 m² in under 5 minutes or 360 square feet. Ions do not replace carbon. Carbon is on the 3250i and both Winix models, and not on the plug-in, the Mini or either GL2103. One Mini buyer did not get smoke smells to clear. One 5500-2 buyer said parrot dander did not clear like ordinary dust. Black dust on a wall is the filter-free outcome a retailer, Allergy Cosmos, warns about.
PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack

Testsieger

PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack
5.5/10about £10.99
View offer

The hybrids, and the machine that was removed

Winix is the hybrid with a switch. PlasmaWave off, and the HEPA and carbon remain. The 5300-2 at about £149.99 has a review that confirms the switch, and a light sensor that dropped plasma in the dark. The 5500-2 at about £159 has 27,540 reviews against 114. Blueair’s charge is part of HEPASilent, so there is no separate off switch. The 3250i adds carbon. The Mini does not. A Levoit Core Mini was removed because the listing says it does not use negative ions. If you want the filter with PlasmaWave off, how to use an air ioniser covers that switch.

When to pick which

Pick the PTYcrazy only when you will dust and ventilate. Pick the MELEDEN for about 10 m² if you own a USB charger. Leave the JINPUS unless you accept the mixed reviews. Pick the Mini on the 8.6 m² bullet, the 3250i when you also want carbon, and a Winix when you want CADR 390 m³/h with PlasmaWave off. Prefer the 5500-2 for 27,540 reviews. Prefer the 5300-2 only after the light-sensor note. None of them is asthma treatment. SAGE, on 4 November 2020, said air cleaning does not replace ventilation.

Common questions

Will a plug-in ioniser catch pollen the way a HEPA filter does?
No. The PTYcrazy has no filter. Tech Advisor’s account of ionic purifiers is that particles fall and pollen is not taken out of circulation. A HEPA-style claim, such as the MELEDEN’s 0.3 micron line or the Winix HEPA stage, is the listing that at least names a medium to hold the grain. The percentage on the bullet is still the seller’s claim, not a BS EN 1822 certificate in the file.
Is HEPASilent a HEPA filter or an ioniser?
Blueair describes it as both parts in one path: mechanical media plus an electrostatic charge so particles cling to that media. The Mini and the 3250i are not filter-free plugs. They are also not a PlasmaWave switch you toggle beside a separate HEPA. The charge is built into the filter system. Carbon is extra on the 3250i and not stated on the Mini.
Is PlasmaWave the same as a negative-ion plug?
No. PlasmaWave on these Winix listings sits with a pre-filter, carbon and HEPA, and reviews say it can be left off. The PTYcrazy is the plug: ions, no filter, no off switch stated. A buzz or an odd smell with PlasmaWave on is a reason to switch that stage off, not a reason to call the Winix a £159 version of the £11 plug.
Do ions remove smoke smell?
Not on their own. Gases and odours are why carbon is a separate line in the comparison. The 3250i and both Winix models state carbon. The plug-in, the Mini and both GL2103 listings do not. A Winix can still disappoint on smoke if you expected the sensor to treat smoke and VOCs as the same event. One 5500-2 review says the sensor leans to VOCs.
When is a hybrid enough, and when should the ion stage be off?
A hybrid is enough when you want a filter first and you can accept a charge that is built in, as on Blueair, or switchable, as on Winix. Turn PlasmaWave off if you dislike the buzz or a reviewer’s odd smell. If you want no ion stage in the house, that is a filter-only category, not the PTYcrazy.

Related pages

Ioniser ozone and safety

Ioniser

Best ioniser: who each amazon.co.uk listing is for

Ioniser buying guide: plug, desk cube or room unit

How to use an air ioniser: placement, runtime and cleaning

Sources

Public UK sources from the research digest, used for this page on 20 October 2026. Prices, stars and review counts are the amazon.co.uk figures in this comparison. Listing CADR, room and decibel figures were not treated as a lab test.

  1. HSE EH38: ozone workplace exposure (retrieved 20 October 2026)
  2. Electrical Equipment (Safety) Regulations 2016 (retrieved 20 October 2026)
  3. Plugs and Sockets etc. (Safety) Regulations 1994 (retrieved 20 October 2026)
  4. NICE NG149: indoor air quality at home (retrieved 20 October 2026)
  5. NHS Right Decisions: ionisers and asthma (retrieved 20 October 2026)
  6. SAGE EMG, 4 November 2020: air cleaning devices (retrieved 20 October 2026)
  7. Which?: how to buy an air purifier (retrieved 20 October 2026)
  8. Cochrane: ionisers for chronic asthma (retrieved 20 October 2026)