A low-price Levoit filter with strong ratings and smart timing

Yes — the Levoit Core 300-RF-MB Genuine Air Purifier Mold & Bacteria Replacement Filter is worth buying if you own a Core 300 or Core 300S and want an official replacement at the current £39.99 low. With a 4.7/5 rating from 27,368 reviews, it has the kind of user trust that matters for a consumable part that directly affects air quality.

First impressions

This is a purpose-built replacement filter rather than a universal accessory, and that matters. Levoit says it is exclusively designed for the Core 300 and Core 300S, so the main appeal is fit, compatibility, and restoring the purifier to peak performance without guesswork. The green M&B version is aimed at homes dealing with moisture-heavy environments, mould spores, and germs, which is particularly relevant in the UK during damp autumn and winter months when condensation and mould can become persistent problems.

What does the 3-in-1 filtration actually do?

The filter combines three layers: an ultra-fine nylon pre-filter, True HEPA filtration, and high-efficiency activated carbon. The pre-filter captures larger debris such as dust, lint, fibres, hair, and pet fur, which helps prevent the finer layers from clogging too quickly. The HEPA layer is the main workhorse for fine airborne particles, while the activated carbon adds odour control. Levoit also states that the M&B filter has a special addition intended to neutralise harmful germs and mould spores in moisture-heavy environments.

For a UK home, that combination makes practical sense. Spring pollen, summer dust, pet dander, and winter damp all put different demands on a purifier, and replacement filters are what keep performance consistent over time. If your purifier is being used in a bedroom, nursery, or a small living room, a fresh genuine filter is often the difference between noticeable airflow and a machine that starts to feel tired.

How does it perform in real use?

Because this is a replacement filter, performance is mainly about restoring the purifier rather than changing its capabilities. The key strength is that it is made for the Core 300 family, so you are not relying on a third-party part with uncertain fit or airflow resistance. The sealed packaging is also a useful detail: Levoit says the filters are sealed to protect service time, and the plastic packaging must be removed before use, which is a basic but important step that some buyers miss.

The stated 50㎡ suitability is useful as a guide, but buyers should still match that to their actual room layout and purifier placement. In practical terms, a replacement filter like this is most valuable when you are already happy with the purifier itself and simply need to keep it operating as intended.

Build quality and confidence

There is not much to “review” visually with a filter, but the strongest quality signal here is that it is a genuine Levoit part. That reduces the risk of poor sealing, incorrect dimensions, or underperforming media. The biggest warning is also straightforward: this is only for Core 300 and Core 300S owners, so it is useless if you own another purifier. Also, if you forget to remove the plastic packaging before switching the purifier on, the filter will not work properly.

Is it good value for money?

At £39.99, this filter is priced exactly in line with its RRP, average price, and all-time low. That is unusually tidy pricing data and a strong signal that you are not overpaying right now. Compared with the Levoit Core300-RF-TX Toxin Absorber replacement at £39.99, this M&B version is the same price but aimed at a different problem: mould and bacteria rather than toxin absorption. Against the WINIX Zero Filter A at £43.55 and the Genuine Winix 116130 at £52.26, the Levoit comes in cheaper while still carrying a 4.7★ rating.

How does it compare to alternatives?

If you already have a Levoit Core 300 or Core 300S, the main alternative is another Levoit replacement variant rather than a different brand. The Core300-RF-TX costs the same £39.99, so your choice is about use case rather than budget. Compared with the two Winix filters, the Levoit is the cheaper option and has a much more direct compatibility story for its own purifier line. That makes it the safer buy for existing Levoit owners and the less attractive option for anyone shopping without a Core 300 machine.

Final take

This is a sensible, well-priced genuine replacement filter with a strong review base and clear compatibility. The main strength is not novelty; it is the combination of official fit, HEPA filtration, carbon odour control, and a price that is currently at the all-time low.