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The bag can be used to keep your mushroom cake (substrate) humid and safe from contamination. First the bag needs to be sterilized in an autoclave or pressure cooker. The mushroom cake can then be put inside the bag and be closed with paperclips, scotch tape or clothespins. The micron filter on the bag will let air run through, but not micro-organisms.
Size: 10 x 20 x 50cm
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