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Old 20-03-2015, 17:47   #16
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Re: Doing your own freeze-drying

So the tank ( pressure cooker) had water in the bottom of it?
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Old 20-03-2015, 19:15   #17
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Re: Doing your own freeze-drying

No liquid water in the vacuum chamber (pressure cooker) just a small amount of water vapor. The pressure in the vacuum chamber was not a hard vacuum but it was still well below atmospheric pressure so I had to vent it to open the lid of the pressure cooker. You know that half a vacuum is still about 7 lbs per square inch. That is a low of force holding a 10 or 12 inch diameter lid on the pressure cooker!
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Old 21-03-2015, 01:35   #18
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Re: Doing your own freeze-drying

If you have a compressor you may be able to use one of the venturi type vacuum pumps to create the vacuum with less chance of sucking back oil from the compressor.
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Old 15-01-2016, 07:45   #19
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Re: Doing your own freeze-drying

Just to inform. Harvest is having a contest right now, 3 winners will get $2000 discount off their domestic freeze dryers. And it is not limited to US residents!
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