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I think you are mixing up carbon monoxide contamination and carbon dioxide build up. They mean that with oxygen candles you don't risk having your very oxygen

I think you are mixing up carbon monoxide contamination and carbon dioxide build up. They mean that with oxygen candles you don't risk having your very oxygen reserve introduce carbon monoxide in the air you breathe, as it could happen of you have a contamination at the source of compressed air.

SapporoChris 4y ago
Okay, ignoring carbon monoxide contamination. The site also states: "Oxygen cylinders are used in the event compressed air fails and generally require the support of a scrubbing system to remove carbon dioxide and carbon monoxide from the air." If Oxygen cylinders generally require a scrubber I think it's safe to assume that a Oxygen candle will also need a scrubber. They list issues with other systems but don't acknowledge the same problems that exist with their own.