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I've got an old bottle of 2kg CO2 cylinder that is for sale but I don't know when it was last inspected and certified. Is there anyway to find out? There is a whole lot of number printed on the bottle and the closest that I could get to trying to work out a date is a number set that says 08/01...

Just came across this product on ebay. http://cgi.ebay.co.uk/AquaMedic-Membran ... 48406e06cc Has anyone tried this? Is it as efficient as it claimed? It looks like a small enough unit to be easily hide away behing some stem plants and if what it claimed is true then it's a lot cheaper and...

Has anyone ever tried this? http://cgi.ebay.co.uk/AquaMedic-Membran ... _818wt_905 Sound absolutely feasible. Was just having the thought in my head and went and look online and was so gutted that someone else has invented it.

Just wondering out of all the available CO2 diffuser out there, which one have you guys tried that produced the tiniest bubbles? I've used inline diffuser, ceramic diffuser and wooden diffuser but I find that the cheapest and the most efficient one being a small internal pump with a piece of...

I've got a nano CO2 diffuser with ceramic plates. Normally I just inject my CO2 into the inlet of the external pump and I get literally no CO2 bubbles coming out from the other end. Recently I've added a CO2 diffuser into the tank and direct the flow of the outlet of the pump directly over the...