ONA Block Odour Neutraliser


Have you noticed unwanted smells in any of your small rooms or closets? Place the ONA Block Odour Neutraliser inside. It'll diffuse terpenes into the environment and eliminate odours with haste.

£11.75 tax incl.
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Smell: Apple Crumble £11.75
  • Smell: Apple Crumble £11.75
  • Smell: Fresh Linen £11.75
  • Smell: Polar Crystal £11.75
  • Smell: PRO £11.75
  • Smell: Tropics £11.75
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List of all product combinations:
Smell: Apple Crumble £11.75 In stock
Smell: Fresh Linen £11.75 In stock
Smell: Polar Crystal £11.75 In stock
Smell: PRO £11.75 Out of stock
Smell: Tropics £11.75 In stock
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ONA Block Odour Neutraliser: Eliminates Unwanted Smells Naturally

If you’re dealing with substantially smelly indoor spaces, the ONA Block Odour Neutraliser is the solution. It doesn’t just mask unwanted odours, it entirely neutralises them. The inventor created the block to eliminate suspicious aromas safely. It emits aromatic molecules that bind to odours, removing them from small rooms, closets, and tents.


The ONA Block Odour Neutraliser harnesses several compounds to banish lingering scents. The inventor found that terpenes—aromatic molecules found throughout the plant kingdom—have a profound ability to neutralise odours. He engineered a specific formula designed to smell-proof small areas.

Terpenes do more than just usher out smells. These volatile hydrocarbons increase the oxygen content in an area and boast antibacterial and antifungal properties. They’re capable of fighting airborne bacteria when diffused into the air.

Terpenes work across three mechanisms of action depending on the terpene in question and the molecules it’s up against. Some terps absorb other particles by pulling them in and temporarily binding to them. Others work by the principle of adsorption—they pull in odours and hold them on the surface of a solid. Different terpenes eliminate dank smells via chemical reactions. They bond permanently to other molecules and cancel out their stink.


The founder of ONA is an ex-firefighter, experienced at dealing with all manner of dangerous materials. During his career, he noticed that highly toxic chemicals were commonly being used to control odours. He wanted to fix this.

After some intense research, he realised terpenes were the solution. They are safe to use around people, pets, and plants, and cleanse the air in a non-toxic fashion. It’s not just the block that’s environmentally friendly, the recyclable packaging is too.


The ONA block tackles unwanted smells with speed and ease. All you have to do is open the lid and allow the terpenes to diffuse. If your odour problem is particularly bad, remove the block from its case entirely.

The block is available in five delicious scents: Apple Crumble, PRO, Fresh Linen, Polar Crystal, and Tropics.

ONA Block Odour Neutraliser data sheet
Type Accessories

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Reviews (51)
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    Great product!
    Works superb! last long and keeps unwanted smell atbay.

    M. S.

    Fresh linen
    Riecht toll :) auch im Auto super!

    V. K.

    Ich habe die PRO Variante ausprobiert und funktioniert sehr zufriedenstellend.

    T. S.

    Good but expensive
    Decent price on here especially on offer, packaged well by Zami but shipping has been really slow for the last few months. Ona blocks work really well in high airflow areas, one is normally good for the smell produced from a medium to large grow tent. They do sometimes need a bit of scrapping/shaking even with high airflow and will last about a month. Only tried the Pro smell and its nice but strong so can't recommend it for living spaces. I think for what you get they are quite expensive but if you can justify the price they seem to be one of the most effective choices for blocking intense smells (especially in emergencies). I would say your better off saving your money for an air purifier/carbon filter instead of buying these if you just need it for smoking/vaping or a low odor or small grow.

    L. W.

    Perfect for blocking fumes, comes in hamdy when you must be discreet

    D. C.

    Fresh linen
    Heeft een sterke geur maar riekt niet echt bepaald naar fresh linen. Maar de geur is zeker niet slecht. Na ongeveer 15min wachten en een beetje met het potje door de lucht te halen rook de kamer weer goed.

    Y. V.

    Puissant !
    Je recommande, c'est assez puissant pour une plante à condition d'en mettre 1 à partir de la 3° semaine de floraison ! Pour plus de plante il en faut plus je suppose.

    P. H.

    Funktioniert wie beschrieben
    Tolles Produkt, neutralisiert alle Gerüche. Am Besten vor die Abluft oder einen Ventilator gestellt, Dose auf und niemand riecht mehr etwas.

    D. S.


    L. B.

    Werkt goed en aangename geur
    Houd de geuren die niet iedereen hoeft te ruiken goed in toom! De geur van de One blok zelf is aangenaam en niet overheersend. Op you tube zijn er handige tips om de Ona blok ook te gebruiken zeker een aanrader.

    G. W.
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ONA Block Odour Neutraliser
ONA Block Odour Neutraliser
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