2 micron stainless steel diffusion stone
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When using pure oxygen to oxygenate wort a 0.5 micron stone is preferred over 2 micron (shown in picture) as it produces smaller bubbles which provide more surface area for diffusion, speeding up the rate at which the wort absorbs oxygen. Atmosphere based pump aeration systems do not provide enough pressure so larger 2 micron stones must be used.
For more information see our Aerating / Oxygenating Wort guide.
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