TNB Naturals The Enhancer — Natural CO2 Canister for Sealed Grow Tents
Best for: Growers running sealed tents who want reliable CO2 enrichment without propane burners or complicated tank setups
Our thoughts
This is a proper bit of kit. No faffing with regulators, no safety concerns, no monthly gas bills. Shake it, leave it, watch your plants respond. It does exactly what it claims — delivers usable CO2 levels in a compact sealed space. One we sell a lot of for growers stepping up from passive CO2 bags.
TNB Naturals The Enhancer is a water-activated natural CO2 dispersal canister designed for growers who want serious CO2 enrichment without the complexity or risk of propane burners. Made from 100% organic ingredients, each 240g canister produces CO2 for up to two weeks and can reach 1200 ppm in a 12x12x12 space — that's genuine photosynthesis-boosting territory.
The beauty here is simplicity. Add warm water, seal it, shake it, hang it. No equipment to buy, no regulator to tune, no pilot lights to worry about. Just reliable, measurable CO2 delivery in a sealed environment.
How it compares
The CO2 enrichment market breaks into three camps. This sits comfortably in the middle.
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Passive CO2 bags (ExHale, Smart CO2) — Cheaper upfront, totally hands-off, last 6 months. But they're slow and passive, and you've got less control.
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TNB Enhancer (this one) — Active CO2 delivery, 2-week cycles, mid-range price, refillable. You're getting propane-level results without the safety headache or infrastructure cost.
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Compressed CO2 tanks or propane burners — Maximum control, maximum cost. £500-£1000+ setup. Overkill for most home growers.
If you're outgrowing passive bags but don't want to drop £700 on a burner system, this fills that gap properly.
Usage guidance
Initial activation
Remove the cap, add 1 litre of lukewarm water, reseal, cover the small hole on the cap with your thumb, and shake vigorously for 30 seconds. CO2 production starts within 8-10 hours.
Placement and circulation
Hang the canister above your plants in an upright position. Use an oscillating fan to distribute CO2 evenly throughout the tent — this matters. Dead spots won't benefit from enrichment.
Maintenance schedule
Give it a quick shake every day in a 12x12x12 space, or every second day in a 6x6x6. This keeps the reaction active and CO2 output consistent. Takes 10 seconds.
Coverage and deployment
One canister per square metre is the standard recommendation. In smaller sealed tents it'll punch above its weight; in larger spaces you'll need multiples.
Lifespan management
Each canister actively produces for around two weeks. After that, it'll continue generating CO2 at reduced levels for another 4-6 weeks, so don't bin it immediately. Many growers leave the first one hanging and add fresh ones as backup.
Technical specifications
- Format: 240g natural CO2 dispersal canister
- CO2 output: Up to 1200 ppm in a 12x12x12 space (higher outputs possible in smaller sealed areas)
- Active duration: Approximately 2 weeks at full strength
- Extended output: Continues at reduced levels for 4-6 weeks total
- Composition: 100% organic, all-natural ingredients
- Activation method: Water-based (1 litre lukewarm water required)
- Time to CO2 production: 8-10 hours from activation
- Maintenance: Manual shake required every 1-2 days
- Refill packs available: Yes — approximately half the cost of a new canister
Who this is for
- Sealed grow tent operators who want to maximise photosynthesis and plant response
- Growers ready to step up from passive CO2 bags but unwilling to invest in burner systems
- Budget-conscious growers seeking 30-50% yield increases without £700+ equipment outlay
- Those wanting active control over CO2 levels without safety risks of propane or gas
- Operators running 6x6 to 12x12 spaces where tank systems are oversized and expensive
Particularly well-suited to UK growers using sealed tents in converted spaces where gas burner installation isn't practical or permitted.
Our take
This is a genuinely clever piece of kit. It bridges the gap between passive convenience and active control, and it does so at a price that doesn't require a second mortgage. The science is straightforward — plants at 1200+ ppm CO2 grow faster and yield harder — and TNB has built a product that delivers that without theatrics or risk.
If you've got a sealed tent and you're serious about results, worth picking up while stock lasts. Simple, reliable, and proven to work.
