0.5 micron stainless steel diffusion stone
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When using pure oxygen to oxygenate wort a 0.5 micron stone (shown in picture) is preferred over 2 micron as it produces smaller bubbles which provide more surface area for diffusion, speeding up the rate at which the wort absorbes 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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