The part that decides whether the purifier still purifies

The best replacement HEPA filters for 2026

A purifier that seems to have stopped working is, far more often than an electrical fault, a filter that reached the end of its stated life months ago while the fan kept running regardless. Fit is the specification that matters first: HEPA filters are cut to a model's housing, a compatible-model list is published by the maker, and a filter a few millimetres out simply will not seat. After fit: the actual filtration grade claimed — "True HEPA" and "HEPA-style" are not the same claim, whatever the packaging design suggests — the manufacturer's stated replacement interval, and whether the filter comes from the purifier's own maker or a third party, a distinction we report plainly rather than judge.

What we recommend

1. 

   Levoit Original Filter for Core 300S

   Levoit's own replacement filter for the Core 300S, combining a True HEPA layer with activated carbon in one cartridge. Levoit states a 6–8 month replacement interval under typical use, tracked by the purifier's own reminder rather than a fixed calendar date.

   Filter type

   3-in-1 True HEPA + activated carbon, per Levoit

   Compatible model

   Levoit Core 300S only — not a universal fit

   Replacement interval

   6–8 months under typical use, per Levoit's own guidance

   Source

   Official Levoit part, not third-party

   Amazon reference

   B0FHWNM51M (EAN 0810123677092, confirmed DE/FR/IT)

   EAN

   0810123677092

   • The manufacturer's own part, cut to the exact Core 300S housing
   • Combines HEPA and carbon filtration in one cartridge, matching the original filter's design
   • No live offer found on Amazon.es at the time of checking

   Best for: Anyone who owns the Levoit Core 300S and wants the exact, manufacturer-specified replacement rather than a third-party alternative.

   ≈ 32 €

   Check price on Amazon
2. 

   Philips Original Filter for 8/900 Series

   Philips's official combined filter for its 8000 and 900 Series purifiers, matching the 3-layer HEPA and activated carbon design of the filter the 900 Series ships with. Confirmed for sale with a live offer on all four European markets we checked, at prices that vary by roughly 13 € between the cheapest and most expensive.

   Filter type

   3-layer HEPA + activated carbon, per Philips

   Compatible models

   Philips 8000 and 900 Series purifiers

   Source

   Official Philips part

   Amazon reference

   B0DDYBQWJ3 (EAN 8720389041877, identical on 4 markets)

   EAN

   8720389041877

   • Confirmed with a live offer on all four European markets we checked, unlike several other accessories in this family
   • Official Philips part, matching the original filter's stated 3-layer HEPA and carbon design
   • Price varies by roughly 13 € between the cheapest market (Spain, ≈29 €) and the most expensive (France, ≈42 €) for the identical part

   Best for: Anyone who owns the Philips 900 Series and wants the manufacturer's own filter rather than a third-party alternative.

   ≈ 29 €

   Check price on Amazon
3. 

   DAODEFUL Replacement Filter for Xiaomi Smart Air Purifier 4 Compact

   A third-party replacement filter, made by DAODEFUL rather than Xiaomi, built for the Smart Air Purifier 4 Compact. We confirmed a live third-party offer on Amazon.de; we did not find a confirmed listing on the other three markets we checked.

   Filter type

   HEPA replacement filter, per the listing

   Compatible model

   Xiaomi Smart Air Purifier 4 Compact

   Source

   Third-party (DAODEFUL), not an official Xiaomi part

   Amazon reference

   B0H3DGGMLV (DE, third-party offer)

   • Built specifically for the Air Purifier 4 Compact rather than sold as a universal fit
   • A confirmed, live third-party offer on Amazon.de at the time of checking
   • Third-party, not a Xiaomi-branded part — no manufacturer warranty coverage on the filter itself

   Best for: Owners of the Xiaomi Air Purifier 4 Compact who are comfortable with a third-party filter and can order from a German-shipping listing.

   ≈ 43 €

   Check price on Amazon