The only way oxygen can dissolve in water is through contact with the atmosphere. This is accomplished by diffusion between molecules of water in contact with the oxygen in the atmosphere. At the same time as oxygen is entering into the water, carbon dioxide is released or de-gassed into the atmosphere.
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Pond filtration is remarkably simple. It is not difficult to imagine the pond, the piping, the filters, the biofilter and returning the water to the pond being compared to the human body.
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