Fluval Bio CO2 125L

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Product description

The Bio-CO2 Pro system combines the safety of biological carbon dioxide production with the convenience of pressurized delivery. Offering simplicity and unparalleled performance in an easy-to-use format, Bio-CO2 delivers reliable and controllable CO2 through the naturally occurring fermentation process. With safe, low-pressure operation, it is the most secure, simple, and environmentally-friendly aquarium CO2 delivery system available.



  • Easy-to-use CO2 delivery system allows both new and experienced hobbyists to effortlessly grow and maintain vibrant live aquatic plants
  • Safe low-pressure operation – 1.3 bar / 19 psi max. vs. traditional high-pressurized systems (55-80 bar / 800-1100 psi)
  • Provides up to 30 days of reliable CO2 production through a naturally occurring fermentation process involving sustainable raw materials (sugar and yeast)
  • Recharging convenience – no refilling high-pressure cylinders
  • Quick 4-step process requires less than 10 minutes per month to maintain
  • High-quality stainless steel reaction chamber with 100% silicone gasket prevents CO2 escape
  • Adjustable bubble counter with precision regulator and nano bubble diffuser for accurate CO2 delivery
  • Pressure release valve for additional security and peace of mind
  • Starter Bio-CO2 Activator yeast and Booster tablets included – Refill Packs sold separately (#A8457)
  • System is compatible with CO2 level tests (sold separately)
  • Developed in Germany
  • For best results, add tap water with a temperature of 80 – 85 °F / 27 – 30 °C.
    Recommended room temperature should be between 68 – 72 °F / 20 – 22 °C.


What's Included

  • Stainless-Steel Reaction Chamber
  • Adjustable bubble counter with precision regulator
  • Nano Bubble Diffuser
  • Pressure Release Valve
  • Inline Check Valve
  • Gasket x 2
  • Airline with gas barrier (5 ft / 1.5 m)
  • Activator packet x 1
  • Booster packet x 1

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