>A 40 of 50/50 and a 30 of oxygen makes ocean deco diving a lot more fun >and much more practical. Why? It seems to me that you should reverse those and use 2000 psi of O2 in a 40 and your 50/50 in a 30. My logic behind this is the volume of gas you would carry in both bottles would be approximately the same: The 40 filled to 2000 would have 26.66 cu ft of Oxygen and the 30 filled to 3000 would have 30 cu ft of 50/50. Please explain to me why I would want to do it reversed and carry only 20 cu ft of O2 and 40 cu ft of 50/50. thanks in advance, Ted
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