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I have a pressure cooker too, smaller then yours, I need to get it out of storage to see if I can fit a jar in there. Heck for my first time perhaps it is better to do just one jar. What do you think?

If you're doing a regular size monotub it will just take a little longer to colonize the bulk substrate and you can use any size jars too if your PC won't fit the quart size jars.