CO₂ gas
refill aquarium

Are you out of CO₂ supply? No problem! CO2-4U offers refills for both aquarium and food use. Our bottles are made for long-term and professional use, with guaranteed quality with every refill.

How does it work?

• You can only order refills if you already have an empty CO2-4U/JANOX gas bottle.
• Only one refill can be ordered per empty bottle.
• Send your empty bottle to us (at your own expense).
• As soon as we receive the empty bottle, we will send you your refill (full bottle) immediately.