- Sku: A8457
- Vendor: Fluval
Fluval Bio-CO2 Pro Refill Pack
Fluval Bio-CO2 Pro Refill Pack restocks the fermentation ingredients for your Fluval Bio-CO2 Pro low-pressure CO2 system. Each pack contains four Activator yeast sachets and four Booster tablets, pre-measured with high-quality German Champagne yeast plus stabilizers and nutrients for a clean, consistent CO2 supply. Just add sugar and water, and the reaction produces CO2 within about 24 hours to keep your planted tank thriving.
It fits every Fluval Bio-CO2 Pro System (Models 125, 250, and 500). Pair your CO2 with the Bio-CO2 Diffuser to disperse it and the CO2 Indicator Set to keep levels dialed in.
What's In the Pack
- 4 x Bio-CO2 Activator yeast sachets (German Champagne yeast)
- 4 x Bio-CO2 Booster tablets (stabilizers and nutrients)
- Sugar is not included and is sold separately
Dosing by Model
How much of the pack each refill uses, and how long one pack lasts:
| Your system | Per refill | Sugar (separate) | Pack lasts up to |
|---|---|---|---|
| Bio-CO2 Pro 125 | 1 sachet + 1 tablet | 1 cup / 240 g | 4 months |
| Bio-CO2 Pro 250 | 2 sachets + 2 tablets | 2 cups / 480 g | 2 months |
| Bio-CO2 Pro 500 | 4 sachets + 4 tablets | 4 cups / 960 g | 1 month |
Why the Bio-CO2 System
- Safe low pressure. A gentle fermentation reaction, not a high-pressure cylinder, so it is easy and worry-free to run.
- Fast to start. CO2 begins flowing within about 24 hours of mixing.
- Premium yeast. German Champagne yeast with nutrients gives a steady, reliable output.
- Pre-measured. No guesswork. Drop in a sachet and a tablet, add sugar and water, and go.
How to Refill
- Add the sachets and tablets for your model, shown in the chart above, to the reaction canister.
- Add the matching amount of sugar (sold separately) and fill with room-temperature water to the fill line.
- Seal it and wait about 24 hours for fermentation to build pressure and start delivering CO2.
Frequently Asked Questions
Do I need to buy sugar?
Yes. Sugar is the fuel for the reaction and is sold separately. Use plain white table sugar in the amount listed for your model.
How long does one pack last?
It depends on your system: about 4 months on a Bio-CO2 Pro 125, 2 months on a 250, or 1 month on a 500.
Will it work with my Bio-CO2 Pro?
Yes. This refill fits all Fluval Bio-CO2 Pro low-pressure systems, Models 125, 250, and 500.
Freshwater or saltwater?
Freshwater planted tanks. CO2 injection feeds aquarium plants and is not used in marine or reef systems.
Have a question?
Fluval Bio-CO2 Pro Refill Pack
