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Invisibletito123
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Registered: 01/23/10
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Suggestions for a small pressure cooker(for agar)?
    #23815799 - 11/09/16 10:20 AM (7 years, 2 months ago)

I'd like a small pressure cooker, since pcing one 750mL bottle of agar takes forever and seems like a waste of energy in my large AA cooker.

Do any of you have any suggestions?  Google didn't help too much, and when I look at small pcs online, it's hard to tell if they're tall enough to hold a wine bottle.


Thanks in advance.


Edited by tito123 (11/09/16 10:24 AM)


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Offlinespore-ty
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Re: Suggestions for a small pressure cooker(for agar)? [Re: tito123]
    #23815838 - 11/09/16 10:37 AM (7 years, 2 months ago)

Presto 23 qt.


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Invisibletito123
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Re: Suggestions for a small pressure cooker(for agar)? [Re: spore-ty]
    #23818491 - 11/10/16 06:37 AM (7 years, 2 months ago)

Thank you bunches!


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Offlineblackout
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Re: Suggestions for a small pressure cooker(for agar)? [Re: tito123]
    #23819923 - 11/10/16 02:07 PM (7 years, 2 months ago)

Why don't you just get more bottles and do several at a time and keep until needed. It can be remelted in the microwave or standing in a pot of boiling water. A lot of my agar is not even PCd to begin with.


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Invisibletito123
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Re: Suggestions for a small pressure cooker(for agar)? [Re: blackout]
    #23825733 - 11/12/16 11:59 AM (7 years, 2 months ago)

That crossed my mind, but I hadn't heard of anyone else doing it so I guess I brushed it off.  I have tons of bottles from making wine and I want to culture yeast + grow some GFP e. coli too so that may be the best option.


If you don't PC your agar, what do you do?  Can all agar media not be pc'd?


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OfflineKenetic
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Re: Suggestions for a small pressure cooker(for agar)? [Re: tito123]
    #23827053 - 11/12/16 07:46 PM (7 years, 2 months ago)

For agar I use a cheap target pc, only holds three quart jars and get's to 10.5 psi.  I use this:



with an unmodified lid and pc at about 30 min. 

I got the pc at Target for about 40 bucks.  Walmart sells the presto brand which all are 15 psi, the only diff is 20 minutes instead of 30.  Since it's so small it heats up much quicker than my other pc, the 23 q presto.


Don't use the presto 23 q for 750 ml of agar if you have a short agar bottle.  You can fit a tall bottle in that p.c. but it takes forever to heat up to pressure and is a waste of utilities.

(Edit:  You could do as blackout suggested and prep a bunch at once and save for later.)

That's assuming you fill the water level at least half over the level of agar in the bottle you're using.  This helps with boil-over, a result of your agar cooling slower than it's surroundings.

To be more clear:

I started out using a whiskey bottle with a modified lid and could only fit it in my 23 q presto because it was so tall.  My solution was to buy a couple 500 ml pyrex media bottles (even though I only need one) so I could use my smaller pc.  The smaller pc is rated for 10 psi instead of 15 but it's not a problem because I add 10 minutes to sterilization time. 
The whole process is much easier using a smaller pc with a media bottle.  Now, I can prep 20-30 dishes of agar in 5 minutes, cool for two hours, and pour the dishes in five minutes.  Simple as fuck.


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Edited by Kenetic (11/12/16 07:52 PM)


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