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Synthetic Filter Discs (SFDs)

£4£33 (incl. VAT)

Synthetic Filter Disks are a specially made, high density filters used for filtering spawn jars/mason jars. They provide optimum air-exchange for your mycelium whilst keeping contaminants at bay. Used by professionals world-wide for more consistent results during spawn production.

We receive many emails a month from people asking why their spawn is getting contaminated and after a few emails back and forth, about 50% of the time, we find out that poor jar filtration and/or inadequate gas exchange is the culprit.

  • Specially made for mushroom spawn production
  • Premium Quality
  • Can be used repeatedly, forever.
  • More reliable than micropore tape or polyfill
  • 99.97% Filtration efficiency down to 0.22μm
  • Fits regular and wide mouth mason jars
  • Optional small disk for lid modification

Take the guesswork out of spawn production and use what the professions use to get the job done right.

£8.50 Delivery on All UK Orders


Backed by our 100% Satisfaction Guarantee.

£4£33 (incl. VAT)

  • 70mm (Regular Mouth)
  • 90mm (Wide Mouth)
  • 10mm (Small)
  • 1
  • 12

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Purchase today and you will earn 4-33 Points worth £0.16-£1.32!
Purchase today and you will earn 4-33 Points worth £0.16-£1.32!
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Additional information


70mm (Regular Mouth), 90mm (Wide Mouth), 10mm (Small)


1, 12

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