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How to sterilize a substrate
For sterilizing the substrate of your choice you can use special filterbags,
filterboxen or glass jars.
The filterbags and filterboxen are specially
made for mushroom cultivation. They can be pressure cooked and contain a special filter which supplies the
needed fresh air.
You can also use standard glass jars. When using glass jars it's wise to build in a filter yourself. Tyvek filters are
very well suited for this purpose. Punch a whole in the lid. Place the filter disk under the lid and screw it tight. Also the filter wool
used for aquaria can be used very well. Make sure the wool is very tight within the whole of the lid.
When the cooker is closed and put on the gas it will start to build up steam. When the cooker has reached 15 psi the right temperature has
been reached and you can lower the gas. With most cookers this pressure has been build up when there is continuously flowing out steam from
the vent pipe.
Always take care that the jars or filter bags are not directly on the bottom of the cooker, so place a rack on the bottom.
Also put an enough amount of water into the cooker so it will not dry out.
Warning: Before you use your pressure cooker always read and follow the safety instructions which came along with it. Wrong usage of a pressure cooker may result in dangerous situations!
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