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No filter (inoculation holes sealed)
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No filter using a vermiculite barrier (inoculation holes not sealed)
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Cotton + vermiculite barrier
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Cotton only (no vermiculite barrier)
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Polyfil + vermiculite barrier
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Polyfil only (no vermiculite barrier)
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Micropore tape + vermiculite barrier
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Micropore tape only (no vermiculite barrier)
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