Atmosphere based aeration system with pump and diffusion stone
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An atmosphere based aeration system with pump and diffusion stone (shown in picture) can be used to aerate wort. They require 30-120 minutes to aerate. Care must also be taken when handling the diffusion stone as simple hand greases can clog the tiny pores. The air filters also require periodic replacement.
The aeration time required when using diffusion stones can be greatly decreased by using pure oxygen from a tank (since atmosphere is only 20% oxygen). This of course introduces extra equipment in the form of tanks and regulators, extra complexity, and still requires careful handling and cleaning. Aeration with pure oxygen, if not done properly, can also over-oxygenate the wort which can lead to other problems.
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