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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.
Your healthcare provider will pick your oxygen supply based on how much oxygen you need, and how active you are. Oxygen can be supplied the following 3 ways: Compressed oxygen holds oxygen in a metal cylinder (tank) under pressure. The tank can be set to release only the amount of oxygen you need as you breathe.