Injecting CO2 into a planted aquarium promotes plant growth, stabilizes pH, and improves overall balance. But which system to choose? Here is a comparison of the three main methods: DIY, industrial, and expired CO2 fire extinguisher.
Principle: Generate CO2 by chemical reaction (yeast + sugar or citric acid + baking soda).
Suitable for beginners and small volumes (<100L).
Principle: Complete kit with CO2 bottle, regulator, solenoid valve, diffuser, tubing.
Perfect for practical use and no DIY from 50 to 300L.
Principle: Use a CO2 fire extinguisher as the gas source, connected to a compatible W21.8 regulator.
Ideal for enthusiasts, multiple tanks, or aquascaping.
| Criterion | DIY | Industrial | CO2 Fire Extinguisher |
|---|---|---|---|
| Installation Cost | Very low | Medium to high | Medium |
| Long-term Cost | Medium | High | Very low |
| Stability | Low | Excellent | Excellent |
| Maintenance | Frequent | Low | Low |
| Installation | Very simple | Simple | Technical |
| Ecology | Good | Poor (disposable) | Excellent (recycling) |
| Recommended Volume | <100L | 50-300L | 50L to multiple aquariums |
Each CO2 system has its strengths. The DIY is perfect for starting at low cost. The industrial kit remains the easiest to implement. The CO2 fire extinguisher is the most cost-effective, durable, and ecological solution for experienced aquarists. Choose the one that fits your needs, budget, and your willingness to DIY!