(ON SALE ) These are the synthetic filter discs that are featured on our Quick
Colonizing 5-grain Jars. They are thick reusable and have a filter level
of .2 microns, the highest level of filtration available.
These synthetic filters discs fit precisely on any "wide mouth" 90mm canning jar which are commonly used by today's cultivators. Usage of these discs allows a fresh, constant air exchange while preventing the entrance of unwanted contaminates. Use them in place of jar lids, or just drill a hole in the lid, and place the discs under the lid.
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