3" Adhesive Monotub 100% Cotton Disc Filters

4 filters (1 sheet)
$4.99
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Trusted by 350K+ Growers

Trusted by 350K+ Growers

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Achieving successful mushroom cultivation hinges on providing the ideal environment for your mycelium. Our 3" Adhesive Monotub 100% Cotton Disc Filters are engineered to perfectly balance fresh air exchange (FAE) with crucial humidity retention, critical for robust fungal growth in monotubs and grow bags.

Crafted from 100% pure cotton, these specialized disc filters allow for high airflow without compromising the sterile conditions necessary for healthy mycelium development. This design ensures your substrate receives ample oxygen while preventing unwanted contaminants from entering your growing environment.

Each filter features a strong 3M adhesive backing, creating a secure, reliable seal that simplifies application to monotubs, tote lids, or other cultivation containers. This robust adhesion minimizes the risk of detachment, providing consistent environmental control throughout the colonization and fruiting stages.

Developed by mycologists at North Spore, these filters reflect our commitment to providing premium quality supplies that support successful harvests for indoor growers. They are an essential component for maintaining optimal atmospheric conditions, directly addressing common pain points like contamination and inconsistent humidity.

Key features include:

  • Optimal Gas Exchange: Facilitates crucial fresh air while preventing contamination.
  • Superior Material: Made from 100% cotton for reliable performance and durability.
  • Secure Adhesion: Features a durable 3M adhesive for easy, long-lasting application.
  • Monotub Ready: Perfectly sized at 3 inches for standard monotub and grow bag setups.

By integrating these high-performance filters into your setup, you ensure your mushroom cultivation receives the precise environmental control required for vigorous mycelial colonization and bountiful fruiting. Trust North Spore for cultivation essentials that deliver consistent results.

Frequently Asked Questions

We recommend absolute beginners start with our Spray & Grow Kits, which make growing mushrooms at home super easy.

We want you to have the best possible experience with every North Spore product and guarantee free replacements within 30 days of receipt for any damaged, contaminated, or unusable product.

Absolutely! Mushroom cultivation is a great activity to do with the whole family, whether you'd like to grow indoors or outdoors. If you're new to mushrooms, we recommend starting with a Spray & Grow Kit or a Plant & Grow Kit – both make it easy to grow fresh, organic mushrooms at home.

We are vertically integrated — from culture work all the way to spawn and substrate production — ensuring a quality end product. And our staff mycologists keep up to date on all best practices in our field. Additionally, we have a dedicated QAQC team that tests every batch of grain and substrate before it’s inoculated.

Cluster of brown-capped mushrooms with long, light-colored stems against a white background.

Your Trusted Source for Premium Mushroom Growing Supplies

Whether you’re growing mushrooms at home, in your garden, or at a commercial scale, we offer everything you need to cultivate success. We start with the highest-quality OMRI-listed ingredients, mix them in our state-of-the-art facility, and inoculate them in our custom-built lab, so you can rest easy knowing your product will yield the best results.

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