The best way to get oxygen into your wort is by using pure oxygen. This speeds up the process and makes oxygen levels more predictable by the use of a flow meter on the regulator. Due to the higher pressure, a smaller aeration stone can be used (0.5mm). Oxygenation times of about 1-2 minutes give the desired levels of oxygen in the wort. Obtaining an oxygen cylinder from a gas dealer can be relatively expensive though.
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