70 mm Synthetic Filter Discs - Set of 10
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These filters fit neatly within the rim of spawn jars underneath the lid, allowing air exchange but preventing the passage of contaminants. Sterilizable and reusable for life (not for food canning) 99.97% efficient filtration down to .3 microns. For jars with 70 mm diameter openings (regular-mouth canning jars). Set of 10.