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3B - 8″ X 5″ X 19″- 2.2 Mil - 1.5” x 1.5” 5 micron B Filter - Typical Block Size: 5-7 lbs
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This bag is identical to bags 14-A and 3-T except that it has a type B Filter which is best used for Oyster Mushrooms due to it's higher air transfer rate. It is often used with substrate for mushroom production and holds about 5 pounds of substrate.
