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Trenac is right - it depends how fast you use the gas. If you have a biowheel filter, with or without the wheel, or any similar design filter you will be using a lot of CO2 to get the pH to a good level.

But there is another important factor - who is filling your bottle. From my experience welding equipment dealers fill the bottles to full capacity.

I don't know how exactly they fill it or how they measure if the bottle is full but some places don't fill it to full capacity. Reading the high pressure gauge doesn't really help - to me that gauge doesn't tell much beyond "full" and "almost empty".

Your best bet is to stick to a place that you find through trial and error and you know it does a good job filling your bottle.

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