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Gas-permeable bags

Operating principle of the Saco2 Microsac bags

With its double filter seams and depth filtration system, the Full-Gas Microsac ensures the problem-free production of spawn and substrates.

The Full-Gas Microsac is provided with a series of parallel filter seams. Each seam consists of a double row of miniscule filter plugs, comparable to tiny wads of hydrophobic cotton wool. The level of gas exchange and the number of filters depends on the application: mother spawn, spawn, substrate, etc.

fig 1 : The Microsac's double-filter seams

The Microsac seams are unique because of depth filtration. As opposed to conventional spawn and substrate bags that use surface filtration, microsac filters guarantee a much more even and efficient gas exchange. While surface filtration relies on microperforation, Microsac filters are composed of randomly arranged fibres in which microorganisms get trapped, much like the HEPA-filter system. This allows a fluent gas exchange without a drying-out zone below the filters, while still forming a firm barrier against microorganisms.

Microsac: depth filtration
depth filter
fig 2: The Microsac's trademark: depth filtration with
randomly arranged fibres
Non-Microsac: surface filtration
membrane filter
fig 3: Non-Microsac surface filtration with micropores