Lids and Filters (not yet updated visit the forums for better info)
How to set up your lids for the best success
Synthetic Filter Discs:
When sterilizing grain spawn in jars, it is important to facilitate gas exchange (GE) while preventing foreign contaminants from entering the jars. The best and most effective way of accomplishing this is by using synthetic filter discs (SFDs). Synthetic filter disks are specifically manufactured to prevent spores and other contaminates from passing through the filter, while still allowing GE. Linked below are a few methods to make SFD lids.