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COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
The oxygen has not been delivered yet so I am not sure of the size of the cylinder but I did ask for the lightest one. IIf the breathing demand valve produces the same result as an on-demand POC I do not think that it will be there because my oxygen nurse indicated that she did not think that on-demand would work for me.