Exactly what I needed.

I had a bit of a mishap that resulted in needing replacements for the filter disks on the tub I bought from Midwest. I tried to find cheaper DIY alternatives on Amazon but I couldn't find anything near the quality or ease of use. Polyfil is all well and good but now that I've used these I'll never go back. They're a bit pricey but they're long lasting and reusable as long as you're careful with them.

Their site is easy to navigate, shipping was fast and the right product arrived.

I received my monotub adhesive filter discs and mushroom drying kit and 3other items very fast I was surprised by the size of the filter discs I thought they would be smaller I bought 4 five. Grain jars from you I. Innoculated all four jars with a spore syringe in may and exactly 30 days later I took the fully colonized cakes out of the jars and I. Put two cakes into a one gallon ziplock bag that I swabbed with alcohol inside and out all the cakes broke up very easy I did all the cakes that way then I mixed them with with a 5lb bag of midwest's casing material I put four filter discs on my 27 quart. Sterilite plastic mono tub container i got from big box store it's the perfect size for 4 jars and casing six days after mixing cakes and casing material mushroom mycelium has grown through half of the surface of the casing layer very happy with midwests products

What a difference, should have gotten these weeks ago. They are nice and large, giving my mushies more air. Filtered air, and they stuck on very easily. What a class act I have now.