3" Adhesive Monotub PTFE Membrane Disc Filters

4 filters (1 sheet)
€5,95
Quantity

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In Stock. Ships in 2-5 business days.

Trusted by 350K+ Growers

Trusted by 350K+ Growers

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These high airflow, ultra-thin filters give your substrate and mycelium fresh air while maintaining high humidity levels. Manufactured with a strong adhesive backing, these filters are made from PTFE membrane 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.

PTFE (Polytetrafluoroethylene) membranes have a filtration rate of 99.97% and can filter 0.3 μm.

Hole size: 3"
Filter size: 90 mm diameter

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.

Reviews

  • 5 stars: 8 (80%)
  • 4 stars: 1 (10%)
  • 3 stars: 1 (10%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
M
Michael

Same as others

P
Paul Lavigne

I love them, no fuzzy stems! Sucess!

Thanks for sharing, Paul! We appreciate you taking the time to share your experience.

J
Jason Keene
Great filters

These filters are great. They stick very well.

m
mike Dotson

Just what I needed

J
Jason Keene
Good product

Filters were great love them

Thanks for sharing, Jason! We appreciate the kind review.

M
Mitch Looper
Filters

These are high quality micropore filters, perfectly sized for the monotub. Very easy to apply, and very sticky. You won’t have to worry about them falling off!!

Thanks for the great review, Mitch!

M
Matthew Deschenes
PTFE membrane

I have used both styles of filter and the ptfe seem better than the fiber filters- I have not had any contamination issues and have great airflow with them

Thanks, Matthew! We really appreciate your support.

T
Tiffily

They fit perfectly.

A
Andrew

Took to long to get here.

J
Joseph Fowler

There great for passive air exchange