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"oxygen", is actually a highpressure cylinders. Scuba diving filling gas is usually not oxygen, but high pressure air. If you directly take charge of pure oxygen cylinders to scuba diving, easy to cause oxygen toxicity.
Regulations in our country more than 20 meters diving forbids the use of pure oxygen.
So not the bottle problem, but the inside of the bottle gas problem. You don't need modification, replacement of the gas inside. Generally use 12 to 16 l l bottle, basically see you can back up.. Physical nature can carry a larger.
If the bottle capacity is small, can hold two cylinders. Large capacity of the bottle or a diving time short enough.
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