16″ Diffusion Stone Wand (2 Micron)
Yeast needs oxygen to reproduce before fermentation begins. When wort is boiled, the oxygen is boiled off and it must be replaced after it has cooled down. This can be accomplished by splashing, shaking, vigorous stirring, or most effectively, by using a diffusion stone with either pure oxygen or an air pump.
If using an air pump to dissolve oxygen, approximately 40 minutes are required. You will probably have to do this in two or more stages, because the wort will foam to the top of the primary fermenter. The air pump needs to be a deep-water model to be able to push through the 2 micron filter.
If using pure oxygen, about 40 seconds are required. Try it in two 20 second bursts: one before pitching yeast, and another 3 hours after pitching. High gravity beers may require more time because oxygen does not dissolve as easily in liquids with a high specific gravity.
Force cabonating beverages.
To use a diffusion stone to force carbonate beer, champagne, or sparkling meads, you will need a homebrew kegging outfit with CO2 tank, regulator, lines, and a keg. There are charts available online and in books for exact levels of temperature and CO2 pressure to achieve desired carbonation levels. Following is an example for average carbonation in beer. Chill the beer to 40 F. Adjust the regulator to 2 PSI and attach the gas disconnect. Every 3 minutes increase the pressure 2 PSI until 12 PSI is reached. At this point the beer will be carbonated, but it won’t hurt to leave it alone in the refrigerator for a few days under pressure.
Never touch the diffusion stone. Use sanitized gloves. Oils from your fingers will clog the holes.
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