Premium 0.22 Micron Medium Spawn Bags 5"x4"x20" (50-PACK)

These medium spawn/grain bags are made from durable 3 mil polypropylene and feature a 0.22-micron filter patch for improved air exchange and reduced contamination risk.

• The description claims that the bags improve colonization speed and yield healthier mushrooms.
• The description claims that the bags reduce the risk of contamination.
• The description claims that the bags deliver excellent fresh air exchange for faster, more robust growth.