The Fluval Bio CO2 Refill (141.8954) is a specially designed refill pack for all Fluval Bio-CO2 Pro low-pressure CO2 systems. This product enables efficient and easy CO2 production for aquariums by generating CO2 within 24 hours after mixing with sugar. The refill pack contains everything needed to start the biological fermentation process, including pre-measured activator yeast packets and booster tablets. The use of high-quality German champagne yeast, supplemented with stabilizers and nutrients, ensures consistent quality and performance. The simple dosing and long-lasting CO2 supply make this product a practical choice for aquarium enthusiasts looking to create a healthy environment for their fish and plants.

• Contains 4 activator yeast packets and 4 booster tablets for easy application
• Produces CO2 within 24 hours after mixing with sugar
• High-quality German champagne yeast ensures consistent quality
• Long-lasting CO2 supply: up to 4 months for model 125.