Synthetic Sterile Filter Stickers 20mm Hydrophobic Breathable Membrane for Mushroom Cultivation

Great heat and pressure resistance, which can be applied to your autoclaves

How to use: You need to clean and dry the surface before sticking synthetic filter to the hole of the jar lids

Size information: these mushroom disc filter are approx. in 20 mm diameter and can filter 0.3 μm

Breathable material: Great for gas exchange for grain spawn and/or mushroom fruiting.