North Spore 3" Adhesive Filter Patch for Monotub

These high airflow filters give your substrate and mycelium fresh air while maintaining high humidity levels. Manufactured with a strong 3M adhesive backing, these spun-bonded fiber filters are made from 100% recycled filter material and sized to fit over 3" holes. Filters are slightly larger than monotub holes and are designed to keep out foreign spores and other contaminants. Use them in place of polyfill for time savings, fast application, and better protection against unwanted contamination.

To reuse: Clean with 3% hydrogen peroxide solution, being careful to avoid adhesive.

Spun-bonded fiber filters have a filtration efficiency of 98.84% for particles as small as 0.3 μm.