In the water are microorganisms, especially bacteria. The type that uses oxygen. Function get rid of pollutants in waste water by nature. Digestion of organic substances as pollutants by bacteria to reduce spoilage of water. Not too far, causing oxygen shortage or was not born until digestion. We also need to control the oxygen in the water, there is enough. By air, in water management have been circulating all the time. Or spray the air into the water, etc.
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