Grow Tools CO2 Tablets — Budget-Friendly CO2 Enrichment Without the Equipment
Best for: Growers wanting to boost yields without the cost and complexity of CO2 tanks or generators
Our thoughts
CO2 enrichment doesn't need to be complicated or expensive. These tablets do the job properly for growers running smaller setups or first-timers exploring yield gains. Drop one in your water, let it work, and get on with it. One we sell a lot of because they actually work and won't break the bank.
Grow Tools CO2 Tablets are a simple, no-fuss way to add carbon dioxide enrichment to your grow. Drop an effervescent tablet into your water tank, and it dissolves to release CO2 directly to the root zone, where plants can absorb it and boost photosynthesis. No expensive equipment. No gas bottles. No refills. Just a straightforward dose of what plants need to grow faster and yield heavier. Growers report yield increases of up to 20% when they get CO2 supplementation right, and these tablets make that accessible without the headache.
How it compares
CO2 enrichment solutions break down into three camps: tablets, generators, and tank systems.
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CO2 tablets (this one) — lowest upfront cost, no equipment, simple application, best for small-to-medium setups
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CO2 generators — produce heat, need ventilation management, really only make sense at commercial scale
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CO2 tanks with controllers — precise control and security, but thousands in equipment cost plus ongoing cylinder refills
For growers working tents or mid-size rooms who want to squeeze more from their light investment, tablets sit in the sweet spot between pointless and bankrupt.
Usage guidance
Standard application
Drop 1 tablet per 100 litres of water in your nutrient tank. Dissolve it fully before applying. Use twice weekly during active growth for best results.
Timing matters
Apply during light hours when plants are actively photosynthesising. First 2–5 weeks of flowering is when CO2 makes the biggest difference, but feeding it throughout the cycle works across all media types.
Conservative dosing
If you're cautious, use 1 tablet per 250 litres. Overdosing won't harm anything — it just won't add extra benefit. Underdosing won't either.
Works with everything
These work in soil, coco, hydro, hand-watering, or automated drip systems. One note: tablets can temporarily lower pH, so monitor your water and run-off regularly. Extreme pH locks up nutrient uptake, so keep an eye on it.
Technical specifications
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Format: Effervescent tablets
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Dosage: 1 tablet per 100L water (standard); 1 per 250L (conservative)
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Coverage: Approximately 1.2m x 1.2m growing area per tablet
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Release duration: 5–6 hours active release
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Visible results: Within first day of application
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Application frequency: Twice weekly for optimal results
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Compatible media: Soil, coco coir, hydroponics
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Compatible systems: Hand-watering, drip irrigation, automated irrigation
Who this is for
- Growers running small-to-medium grow tents who want yield gains without big capex
- First-time CO2 users testing the water before committing to tank systems
- Budget growers exploring how much difference supplementation actually makes
- Anyone frustrated by the cost of gas cylinders and refill logistics
- Soil, coco, and hydro growers equally — works across all media
Particularly well suited to spaces where a simple, reliable, low-maintenance approach beats complicated systems.
Our take
These are a proper entry point to CO2 enrichment. They're cheap, effective, and do exactly what they claim without requiring you to become an engineer. If you've been wondering whether CO2 supplementation would move the needle on your yields, this is a low-risk way to find out.
Good time to buy while stock lasts. Works with any growing medium, fits any budget, and delivers results growers actually notice.
