All ISTA Aluminium Cylinders are refillable at your local aquarium shop or fire extinguisher refilling centers.
Included in set:
I did expect this to be a lot shorter than it was, but with the stand and dual-guage valve, this works out to be taller than 30cm. This is the biggest difference between "Face Up" and "Face Side" models. The stand and the cylinder are quite stable as well. Everything else is excellent. The diffuser is one of the best I've worked with and will save a lot of CO2 because of it's efficiency. After using it for close to a month, the results can be seen. I used an additional check valve in between the bubble-counter and the diffuser just in case, but the bubble counter functions as a check valve itself. Overall very good experiences throughout. Kudos to Indiefur for delivering this despite the lockdown and offering help as well!
Great looking product value for money
The complete co2 kit for anyone who is looking to use co2 in his/her planted tank. nnProduct not only looks good but also works as promised.