Odour control

Stop the smell travelling.

Neutralising gels, sprays, in-line filters and ozone. A carbon filter cleans air on the way out of the room, while gels and sprays work on the air already in it, which is why most setups end up running both.

Nothing matches all of those filters.

Neutralising gels and blocks

Set out in a pot, working on the air in the room

ONA Gel 426g – Odour Neutraliser, Various Scents

£10.99

ONA Block 170g – Solid-Gel Odour Neutraliser, Various Scents

£8.49

Hesi Smell-Away Smell-Ex – Odour Neutralising Blocks

£10.49

Odour Neutraliser Gel Tub – For Grow Rooms and Tents

£12.95

OCD Gel – DEO-MAX Odour Neutraliser for Grow Rooms

£18.00

ONA Gel 20kg Pail – Commercial Odour Neutraliser

£152.99

ONA Gel 3.8kg – Passive Grow Room Odour Control

£42.49 £44.95

Sprays, aerosols and liquids

For a quick knock-down or a misting line

ONA Smoke Odour Eliminator – Fragrance Free 300ml Spray

£12.49

Odour Neutralising Agent Spray 750ml – For Rooms and Tents

£7.49

ONA Liquid 922ml – Odour Neutraliser for Misting Systems

£22.49

OCD Pocket Spray – Odour Neutraliser for Grow Rooms

£6.49

ONA Liquid Odour Neutraliser – Concentrate for Sprayers

£17.49

OCD Deo-Max Aerosol – Grow Room Odour Neutraliser

£9.49

ONA Spray 250ml – Fast-Acting Odour Neutraliser

£8.49

Fan units and ozone generators

Disperse neutraliser, or treat the air in the duct

ONA Air Filter – In-Line Grow Room Odour Control

  • Brand ONA
  • Type Odour Control
  • Options 5 to choose from
  • Price from £26.45
  • Availability In stock
£29.45

Grow Gadgets Ozone Generator – 15-50mg/h Odour Control

  • Ozone output 15-50mg per hour, adjustable
  • Voltage 240V
  • Installation inline in ducting, after the carbon filter
  • Function odour, bacteria and mould control
£21.99

Uvonair UV-80H In-Duct Ozone Generator – Odour Control

  • Duct fitting 8in (200mm)
  • Coverage 5,000-10,000 cu ft (150-300m³)
  • Output settings Low = 1 bulb, High = 2 bulbs
  • Maintenance front-access panel for bulb replacement
£359.50

Uvonair UV Ozone Generator – In-Room Odour Control

  • Type Ultraviolet ozone generator, in-room
  • Models Uvonair 1000, 3000 and 5000
  • Coverage 30, 100 and 150 cubic metres
  • Generation Ultraviolet lamp
£247.99

ONA Air Breeze Fan Unit – For Gel Pots and Pails

  • Brand ONA
  • Type Odour Control
  • Price from £49.49
  • Availability In stock
£49.49

Uvonair CD Series In-Duct Ozone Generator – Odour Control

  • CD-800 8" (20cm) duct, 10,000-20,000 cu ft (300-600...
  • CD-1000 (1 Cell) 10" (25cm) duct, 10,000-20,000 cu ft (300-60...
  • CD-1000 (2 Cell) 10" (25cm) duct, 10,000-40,000 cu ft (300-1,...
  • CD-1200 12" (30cm) duct, 10,000-100,000 cu ft (300-3...
£609.95

ONA Air Cyclone Fan – 20L Gel Tub Odour Control

  • Airflow 121 CFM (approx. 206 m³/h)
  • Coverage up to 464 m² (5,000 sq ft)
  • Fan speeds five settings
  • Power draw 12 W
£99.49

Carbon filters

Clean the air on its way out

Rhino Hobby Carbon Filter – RC412 Odour Control

  • Carbon Australian-mined RC412, virgin fine granular acti...
  • Carbon bed depth 30mm
  • Body lightweight aluminium drum with washable pre-filt...
  • Included reversible base and spigot duct, pre-filter sleeve
£30.45

CarboAir 60 Carbon Filters – Strong Odour Control

  • Carbon bed depth 60mm, coarse high quality granular carbon
  • 6" (150mm) x 660mm 1350 m3/h
  • 8" (200mm) x 660mm 1700 m3/h
  • 10" (250mm) x 660mm 2000 m3/h
£133.45

VIVOSUN AeroZesh Carbon Filter – Grow Tent Odour Control

  • Filter type Activated carbon odour filter with pre-filter
  • Carbon Virgin Australian activated carbon, premium impor...
  • Carbon rating 1050+ RC 48
  • 4in (100mm) 448 m3/h
£64.49

Mammoth Lite Carbon Filter – Grow Room Odour Control

  • Brand Mammoth
  • Range Mammoth Lite carbon filters
  • Carbon bed depth 38mm
  • Carbon type RC 48 Australian activated carbon
£112.95

CarboAir 50 Carbon Filter – Grow Room Odour Control

  • Brand CarboAir
  • Model CarboAir 50
  • Carbon bed depth 50mm
  • Carbon type Premium virgin activated granular carbon
£49.49

CarboAir 75 Carbon Filter – High VOC Odour Control

  • Carbon bed depth 75mm
  • Body length 1m (1000mm)
  • Carbon type Virgin activated granular carbon
  • Flange sizes 315mm (12") and 355mm (14")
£414.95

CarboAir 100 Carbon Filter – 100mm Bed for Large Grow Rooms

  • Carbon bed depth 100mm virgin activated granular carbon
  • 10" x 660mm 3800m3/h, 28.35kg, 48 x 49 x 75cm
  • 10" x 1000mm 5800m3/h, 45.5kg, 48 x 49 x 106cm
  • 12" x 660mm 4250m3/h, 33.05kg, 54 x 54 x 75cm
£261.95

The full range

Uvonair UV-80H Replacement UV Lamp – Spare Bulb

£89.95

OCD Cube – Drop-In Odour Neutraliser for Grow Rooms

£9.95

Zip-Zag Smell Proof Bags – Resealable Storage for Curing

£10.49

Odour control beyond the carbon filter

A well-sized carbon filter deals with the air leaving your tent through the extraction run — it does nothing for the smell that escapes when you open the zip, or that clings to a grow room outside the filtered chain. That's the gap ONA products fill. ONA Gel comes in 426g tubs (£9.45) for a single room, 3.8kg (£42.95) for a whole grow room, and 20kg (£154.95) for anything commercial — the gel neutralises odour molecules rather than masking them with fragrance.

For a lighter touch, ONA Spray (250ml) and ONA Blocks (170g) suit smaller spaces or topping up between gel changes. A Grow Gadgets Ozone Generator (£29.95) is a stronger option for an empty room between grows — never run ozone in an occupied space. OCD Deo-Max Aerosol (£8.49) is the quick-fix option for a sudden smell after opening the tent.

Sizing your setup

Match gel size to room size, not tent size — the gel treats the air in the space around your extraction, so a 3.8kg tub for a spare bedroom is usually plenty. If your filter itself is undersized or the carbon is tired, that's a different problem: check our carbon filters range and the fan and filter sizing guide first. Free UK delivery over £60, or call 020 3488 0419 for advice on odour control for your specific room.