erowids on using a steamer or boiler;
Normally, most people will elect to use a large kitchen pot to sterilize the culture jars. A pressure cooker can be used instead. Instead of letting the substrate jars sit in boiling water for 1 hour, you can place them in a pressure cooker set to 10 or 15 P.S.I for 20 minutes.
One caution. Do not release the pressure until the unit is fully cooled. The substrate in the culture jars will be at 250 F. If pressure is released, moisture will boil out of the substrate.
Advantage:
If you use a pressure cooker, you can sterilize the jars quicker and with more certainty.
Disadvantages:
Pressure cookers cost money. If you already have one, there is no disadvantage. You may as well use it!