Zonon 128 Pieces Synthetic Filter Paper Stickers 20 mm 0.3 ?m Synthetic Filter Disc Tape Mushroom Applied Under Wide Mouth Mason Jar for Mushroom Cultivation

I like them way better then using micro pore tape it's to easy to get contaminated and that is total loss if your container gets any bread spores on it one little spore from your loaf bread you had to longAll it takes is one microscopic spore to get into your sterile grain

So handy! Easy to use! Way better than tape or poly-fil! Will definitely buy again!

I put these on mason jars for mycology projects. Used to get contamination all the time before I started using these. Now I can't live without these

I have used AND REUSED these filters on well over a 1000 different jars of spawn. From WBS, to Corn, to Oats I have had and maintained tremendous success using them. Any contam’s I can only equate to my own doing. Because like I said I’ve used & reused these filters multiple times w/ no issues. If your spawn has somehow been contaminated. I would definitely change it out before the next use.I would recommend using plastic lids since they won’t rust from multiple uses. I also recommend using a 1/4” drill bit for your Gas Exchange (GE) hole. As this seems to be the perfect size and best fit for these filters!I HAVE ONLY EVER NEEDED TO PUT 1-FILTER ON EACH JAR! Ive seen ppl say to use multiple but IMO I do not feel it’s necessary. I place on top on the outside of every jar. That goes for both regular & wide mouth lids.

I like the filters

Great product does what it is supposed to do

If you need these for liquid culture/grain jars they work just fine. They stick well and handle autoclave as intended.

Drill two 1/4 inch holes. Insert a self-healing injection port and put one of these on the other hole. Use for liquid culture or spawn jars to allow for air exchange. I've only gotten to use them once but they held up to pressure cooking for 90 minutes to sterilize.