OCD Gel 22 Litre - Bulk DEO-MAX Odour Elimination for Grow Rooms
Best for: Larger grow operations and multi-room setups that need odour control covering a big area for months at a time.
Our thoughts
OCD's DEO-MAX gel is one of the better-known professional odour eliminators in this category, and at 22 litres it's built for scale rather than a single tent. If you're running multiple rooms or a bigger space, buying bulk beats restocking small tubs every few weeks. Reliable performance at a sensible price.
OCD DEO-MAX Gel is a professional-grade odour eliminator made by Odour Control Developments, working through a two-stage process rather than simply masking smells. It chemically breaks down airborne odour molecules to neutralise them at the source first, then releases essential oil fragrance as the second stage, leaving the treated space genuinely fresh rather than just perfumed over the top. It also carries anti-bacterial and anti-fungal properties, which is useful in humid grow rooms and drying spaces where mould and bacteria can build up alongside odour.
The 22 litre size is aimed at larger grow rooms, drying rooms and ventilation systems where a small tub wouldn't last or cover the space. It can be used straight from the tub, opened and placed in the room, or scooped out into shallow trays and positioned at multiple points to increase coverage across a bigger area. It's available in five fragrances: Fresh Linen, Original, Bubblegum, Orange and Lemon.
How it compares
Professional odour-eliminating gels are a small but well-established category in grow room odour control.
- Versus ONA Gel, another well-known odour neutraliser used widely in grow rooms, both work by chemically neutralising odour rather than masking it, with OCD's two-stage DEO-MAX process built around the same core principle.
- Versus generic unbranded odour gels, OCD's DEO-MAX formula is independently tested and carries added anti-bacterial and anti-fungal properties on top of odour neutralisation.
- Versus passive air fresheners or sprays, a gel tub works continuously in the background rather than needing repeated manual spraying.
Buying the 22 litre size makes sense once you're covering more than one room, working out cheaper per litre than repeatedly buying smaller tubs.
Usage guidance
Placement and coverage matter more than dosage with a passive gel like this.
Simple placement
Shake the tub, remove the lid, and place it in the room or ventilation path where odour is strongest.
Wider coverage
For bigger rooms, scoop the gel out into shallow trays or dishes and position several around the space rather than relying on one open tub.
Ventilation systems
Position a tray near the extraction path so odour-laden air passes over the gel before it's vented, rather than placing it somewhere airflow doesn't reach.
Topping up
Because it's a passive gel, it will gradually deplete, check coverage areas periodically and top up or replace once the gel visibly reduces.
Technical specifications
- Product type: Two-stage chemical odour neutralising gel
- Manufacturer: Odour Control Developments (OCD)
- Mechanism: Breaks down odour molecules, then releases essential oil fragrance
- Additional properties: Anti-bacterial, anti-fungal
- Size: 22 Litre
- Fragrances available: Fresh Linen, Original, Bubblegum, Orange, Lemon
- Best suited to: Large grow rooms, drying rooms, ventilation systems, multi-room setups
Who this is for
- Larger grow operations and multi-room setups needing bulk odour control
- Growers who don't want to keep restocking small tubs every few weeks
- Anyone running drying rooms where odour is at its strongest
- Growers who want anti-bacterial and anti-fungal properties alongside odour control
If you're only running a single small tent, the 4 litre OCD Gel is the more sensibly sized option.
Our take
For anyone running multiple rooms or a genuinely large space, the 22 litre tub is the sensible way to buy a proven odour gel without constantly reordering smaller sizes.
Reliable performance without overpaying for features you don't need, just proper odour control at bulk volume.
