20mm Synthetic Filter (30 sheet)

A compact synthetic filter for gas exchange in mushroom culture containers. It allows air to pass through while helping limit the entry of airborne contaminants.

• Purpose: Provides filtered gas exchange without opening the container

• Applications: Suitable for compatible grain spawn jars, liquid culture jars, and custom mycology lid assemblies

• Use: Secure the filter over a smaller gas-exchange opening in a clean, dry jar lid. Ensure the edges seal completely around the opening while leaving the filtering area unobstructed.