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Any Regular Mouth 70mm canning jar which are commonly used .
Any wide mouth 87mm canning jar which are commonly used.
Any wide mouth 90mm canning jar which are commonly used.
Can be used within a pressure cooker, steam sterilizer or autoclave,You can also DIY them into regular mouth size or any other smaller sizes.
Used for Mushroom Cultivation
Brad
June 1, 2025
These are made of some sort of cloth, with one plastic side. The higher quality SFDs available from specialty suppliers (ShroomSupply, Fungi Perfecti) are polypropylene and extremely durable. I won't be trusting these beyond a couple runs each. Also, they were way oversize for typical 80mm (often referred to as 90mm) wide mouth jars, so I had to tediously cut them down, causing fraying.
scottyfon
May 29, 2025
Using these one can put jars atop one another saving shelf space, and they breathe well even if I screw lids on very tightly, though that is completely unnecessary. I boil jars, lids, and filters a day before filling and pressure cooking and store them in the laminar flow hood till the next day, and have far less contamination than any other type of filter, such as those stick on patches or those filters one sticks into holes in the lid. In fact, I've used these hundreds of times and never found contamination at all with these. Spores won't fall upward under the lid and make it to this filter, whereas gravity eventually carries spores through or onto damp 2 micron patches if they are atop lids stuck in grommets or glued on. Once spores land on the top surface of a damp filter, the other type that is, they will sprout and grow right through it much the same as the way mushrooms or molds will grow right through filter patches on grow bags requiring a clean hepa filtered room for those to be used. Place the smooth 2 micron side of the filter toward the stuff inside the jar and the fibrous side toward the inside of the lid. They should tell you that but I think they expect you to know already. Also, I boil these and reuse them over and over again without problems, and have no troubles from the water still making them wet while in use. They are three or four millimeters wider than the inside of the lid, so centered carefully in there they hang over past the edge of the jar's glass perfectly, and growing jars of substrate can be stored on a shelf in a room not hepa filtered.
Allan
March 30, 2025
Wow. This is so effective and easy to use and reuse. Allows gas exchange and keeps contamination out. I modify these for my needs. I use a paper punch and punch out a hole in the center. Fill the hole with red RTV high temperature gasket sealer to make a self sealing port. Wax paper does not stick as it is drying. Pressure can to sterilize my mushroom mycelium solution only 15 mins max at 15 pounds pressure or it will scorch the sugar and it won’t grow mycelium . Let it cool. Then wipe the port with alcohol and use a syringe to inject into the port. You can also cut them down. Hold a small mouth jar lid against the soft side and it won’t slip when you use scissors to cut around the lid. The picture is what 2cc of a 10cc syringe of mycelium injected into sterilized solution looks like in about 2 weeks. The growth is much increased with the air exchange. Using it on a pasta sauce jar. 1 1/2 Tbl spoon of corn syrup and 1/2 Tbl molasses in 1/2 gallon water is what I use. Also use to make reusable agar culture jars.
Jordan
February 8, 2025
So far good. Attached to lids and Pressure cooked them and they still work great. Happy customer and not a waste of money. They serve there purpose well.
Someone Else
January 10, 2025
This isn't my first SFD rodeo, have been buying them as needed for many years now and the quality and construction of these was not what I was expecting compared to any synthetic filter disc that I have purchased from previously. these are seemingly have a completely different material, softer, more bendy/pliable, seem to have less integrity and form overall. Previous synthetic filter discs (sfd) have always felt kind of foamy, almost like a thick paper coated in foam (although I am aware they are not made of paper, they are completely synthetic) I don't know how to describe the feel of other than that they're more like fabric or felt I guess, one side is shiny, the reverse is knit material that will catch on your hands if they're a tiny bit dry. Thickness is about the same. I have included photos so you can observe the differences for yourself. Please ignore the pink and other colors that you see along the outside of the older style sfd, I was using it as a template for tracing on these new ones that I'm reviewing, the new ones do not fit in the grey plastic ball leak proof lids and must be cut down
Dj
November 14, 2024
Definitely larger than 90mm, doesn't fit metal rings or plastic lids how it should. These are much more pliable than standard synthetic filter disc's and one side is glossy. You can easily bend them how you need them to go for them to fit but again not 90mm as advertised.I will see as far as filtration goes but I don't imagine they won't be good to keep the nasties out.
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