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your gunna die in the end
anyways so what dus it really matter?

Your a slave to the money and then u die

15 minutes might be a bit short, I run them for 30 minutes. Timing starts after the pressure cooker reaches full pressure.

I normally run around a 2-5% infection rate (usually less than 1 in 20 jars), which I find acceptable.

The two main sources of infection I've found are improper sterilization and contaminated spore solution.