CO2 Fusion Foliar Spray — Dissolved Carbon Supplement for Hydroponic Growing
Best for: Hydroponic growers looking to boost photosynthesis and close the carbon gap without gassing systems
Our thoughts
This solves a real problem in hydroponics — plants are missing the dissolved inorganic carbon they'd normally get from soil. CO2 Fusion sprays it straight onto the leaf where it matters. No gas bottles, no ventilation losses, no worker safety concerns. Clever bit of kit.
CO2 Fusion is a foliar spray designed specifically for hydroponic growers. It delivers dissolved inorganic carbon (DIC) and plant-active amino acids directly to the leaf surface, addressing a fundamental gap in soil-less growing: at least 10% of the carbon plants need comes from the soil as dissolved carbon. Hydroponic crops get none of that, which is why relying on passive air diffusion alone leaves you short. Spray this on and you're giving your plants the carbon they'd naturally get, without the complications of CO2 gassing systems.
How it compares
CO2 Fusion sits in a niche — it's not a general foliar feed, it's a carbon-specific supplement designed for hydroponic systems.
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vs. CO2 gassing: No ventilation losses, safer for workers, works in any room setup, no gas bottles to manage
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vs. general foliar sprays: Specifically formulated for the carbon deficiency problem in hydroponics, not just micronutrients
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vs. doing nothing: Plants can show up to 30% improved growth rates when carbon levels are optimised — this delivers that without the hassle
In short: if you're running hydroponics without CO2 gassing, this fills a real gap.
Usage guidance
CO2 Fusion is straightforward to use. Spray during your lights-on period for best results.
Daily application
Spray 2-3 times per day within your light window. Mist the upper and underside of leaves evenly until lightly covered. No need to soak — a thorough mist is enough.
Early vegetative and cutting stage
Start using CO2 Fusion from propagation onwards. Speeds up rooting and early leaf development noticeably. Particularly effective during the first 3-4 weeks of growth.
Through to harvest
Safe to use right up to two weeks before harvest. The formulation won't cause leaf burn even under full lights, and there's no risk of overdosing — the plant uses what it needs.
Key timing note
Apply when lights are on. This keeps the stomatal pores fully open and the transpiration system working at maximum, allowing better uptake of the carbon and supporting compounds.
Technical specifications
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Format: Foliar spray (mist application)
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Sizes available: 500ml and 1L bottles
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Active ingredients: Stabilised dissolved inorganic carbon (DIC), plant amino acids, saccharides (mannose, glucose, rhamnose), carbohydrates (mannan, galactan and derivatives)
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Application frequency: 2-3 times per day during lights-on period
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Leaf burn risk: None — safe to apply during full light conditions
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Overdose risk: No danger of overdosing due to unique formulation
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Harvestable: Can be used up to two weeks before end of growing cycle
Who this is for
- Hydroponic growers running ventilated rooms where CO2 gassing is ineffective
- Growers wanting to optimise photosynthesis without gas bottles and safety concerns
- Anyone propagating cuttings — speeds rooting and early establishment
- Experienced growers fine-tuning yields and crop cycle times
- New growers wanting a straightforward performance boost without complexity
Particularly suited to hydroponic setups where the carbon gap is costing you growth — this is the practical fix.
Our take
CO2 Fusion solves a real problem that most hydroponic growers face but don't always recognise. Your plants are missing dissolved carbon, and this gives it to them directly. No gas systems, no ventilation losses, no worker safety grey areas — just spray and let the plant use what it needs.
If you're running hydroponics and not gassing, this is worth picking up. Even if you are gassing, it complements root feeding nicely in ventilated rooms where gas injection doesn't hold. Good time to grab it while stock lasts.
