Colombo Co2 Diffuser 3 in 1

Check valve, bubble counter & diffuser in one compact device

Available in Medium & Large — fewer hoses, clearer CO2 system

✅ Level: Easy — Place in the CO2 hose and attach in the aquarium. No tools needed.

With the Colombo CO2 Diffuser 3 in 1, you have a check valve, bubble counter, and diffuser in one compact device. Fewer hoses, fewer connections — simpler and clearer CO2 system. The bubble counter allows you to easily check and adjust the CO2 dosage.

🌱 Product specifications

🚚 Delivery & warranty

• Delivered quickly from our store — ready to use immediately
• Shipping Tuesday or Friday → Read more about shipping
• Delivery with track & trace, usually within 1–2 working days
• Problem with your order? We'll solve it together.
• Free shipping from €59,-

✂️ Usage tips

Choose Medium for aquariums up to approx. 200 liters and Large for larger aquariums. Attach the diffuser low in the aquarium for maximum CO2 absorption. Use the Colombo CO2 Indicator to monitor the CO2 value and adjust the dosage via the bubble counter.

💡 Tip

The 3-in-1 function makes the CO2 system clearer and reduces the risk of leaks at connections — ideal for a tidy aquarium setup.

❓ Frequently asked questions

Which size should I choose?
Choose Medium for aquariums up to approx. 200 liters and Large for larger aquariums with higher CO2 requirements.

How do I use the bubble counter?
Count the number of bubbles per second and adjust the CO2 regulator until the desired CO2 value (20–30 mg/l) is reached. Use the Colombo CO2 Indicator for precise control.

Do you have another question? Feel free to contact us — we are happy to help you make the right choice for your aquarium.