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The Sera 500 uses a 16/22mm hose connection. I recently posted some information about poor quality control on the Sera unit I bought. Easily remedied and now working very well on the outflow from my 1500L/h filter.

In an effort to minimise the amount of equipment in my 100L cube, I replaced my CO2 diffusor with a Sera 500 CO2 reactor. I added this in the outlet pipework of my Eheim filter which is rated at around 450L/hour. I found that the rotors in the reactor slowed down and stopped almost immediately...

Anyone had any experience with ordering CO2 from this firm? They come up on internet searches for cheap disposable bottles but I've had a disappointing time with them. Paid for a bottle two weeks ago and I haven't received it. Can't raise them on the 'phone and they won't respond to email...

Many thanks for the advice - this is what I suspected. Guess I'll be selling two full welding gas bottles and having to buy the very expensive Dennerle replacments.

I have an oldish (about 10 years) Dennerle regulator and have been using their 500g disposable cylinders. I bought what appeared to be an identical cylinder from Machine Mart - however the thread diameter is the same but appears finer than on the Dennerle original and will not fit. Does anyone...