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| Hole size | 3 inches |
| Filter size | 90 mm diameter |
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.
Making the world of mushrooms accessible to all
North Spore was launched in 2014 by a mycologist, an organic farmer, and a photojournalist -- three college friends brought together through their shared love of the mycological world.
What began as a simple love for mushroom foraging and cultivation quickly developed into an obsession with all things fungi. From there, an urban mushroom farm was born, as was the desire to spread the spore to the masses.
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Customer Reviews
5.0 Based on 2 Reviews
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NH
07/29/2024
Nicole H.
United StatesI recommend this product
Love these
I love these filters if I use anything else I tend to have an issue with contamination, these filters work amazing :)
16 filters (4 sheets)
07/30/2024
North Spore
We're so glad everything is working out for you, Nicole! Thanks for the great review.
AK
11/02/2023
Aaron K.
United StatesFilter patches work well!
Fits well over any hole!
4 filters (1 sheet)
11/10/2023
North Spore
Thanks, Aaron! We really appreciate your support.
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