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OfflinefirstTIMER420
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PRESSURE COOKER USE FOR STERILIZATION
    #21718328 - 05/24/15 05:44 PM (8 years, 8 months ago)

Hey all, I am currently in the middle of my first BRF/PF tek and I am about to start another batch or two, considering I have 4 more spore syringes.  now, for my first time, I used a pot on the stove and used steam to sterilize the jars, now, since I think this might be an actual do-able hobby, im thinking about buying a pressure cooker.(and also switching to agar, but that's a different story)

-I need opinions based on experience, what is a good brand of pressure cooker to buy for a relatively moderate price?

-Also, what are the do's and dont's/important RULES of pressure cooker use(like not letting the jars touch I think)

-is it ok to let the jars touch the bottom?

-what would be different from what I did using the boiling water in the pot on the stove?

If there is anything pertinent to this topic that I did not include in my post, please feel free to mention it or let me know.

-Thanks


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Edited by firstTIMER420 (05/24/15 05:49 PM)


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OfflinePinPornProducer
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420] * 1
    #21718374 - 05/24/15 05:57 PM (8 years, 8 months ago)

23Qt Presto, $75 at Wal-Mart


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: PinPornProducer]
    #21718388 - 05/24/15 06:04 PM (8 years, 8 months ago)

I use a little 6qt Mirro I got for 8$ at Goodwill. I can fit 4 widemouth pint jars, or two quart jars at a time. I work at such a tiny scale and so infrequently, its perfectly fine for me.

My PC has a little floor plate thing so that the jars dont touch the bottom. Having them directly on the bottom can lead to cracking and problems, since you'll get direct heat transfer. Other than that Its not much of a big deal. Cover the tops with some foil to keep water out.

Basically you crank the heat and leave the valve open/jiggle weight off. Once steam starts coming out, give it a minute or three, put on the weight on. Weight for it to start dancing, then drop the heat to a low simmer. You want a bare hiss, with just the occasional jiggle. This will keep the pressure and steam up, and you wont risk running it dry or blowing the safety valve.

The first few times you pressure cook will be terrifying. All manner of terrifying noises. Just be careful and err on the side of caution and it will be fine.

edit: forgot a step, sorry its been a while since I used it!


Edited by matsc (05/24/15 07:01 PM)


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OfflineLumpyNutz
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21718396 - 05/24/15 06:08 PM (8 years, 8 months ago)

Dont really matter whatbrand PC to get. i got mine at jcpenny for like 20 bucks on sale and works just fine.
run pc on medium heat.
cover all jars with foil to prevent moisture from getting into the jars.
its ok if the jars touch.
dont have the jars directly touching the bottom of the PC!This could cause them to explde! I usually line the bottom with lids, a layer of foil over the lids, and place the jars on top of this layer. add about 2" of water (u dont want the water anywhere near the tops of the jars) and pc for like 90. then wait 24 hours to cool and noc em up! also do not be impatient u need to wait the whole 24 hours for the jars to cool or else u could kill you spores from the heat when u noc them.

hope this helps. happy growing!:mushroomtwirl:


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Invisiblemush madness
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: PinPornProducer]
    #21718426 - 05/24/15 06:20 PM (8 years, 8 months ago)

Quote:

PinPornProducer said:
23Qt Presto, $75 at Wal-Mart




That's the one I have, works like a champ


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: mush madness]
    #21718452 - 05/24/15 06:29 PM (8 years, 8 months ago)

the all americans are king, the 23qt presto works well.

be sure you get one that allows you to set or monitor the pressure so you can be sure its 15psi for 2 hours.


--------------------
->$10 FLOW HOOD ALTERNATIVE <-

. i cleaned a mold contaminated live culture and saved it. (might have useful applications)

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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21718514 - 05/24/15 06:55 PM (8 years, 8 months ago)

Quote:

firstTIMER420 said:
Hey all, I am currently in the middle of my first BRF/PF tek and I am about to start another batch or two, considering I have 4 more spore syringes.  now, for my first time, I used a pot on the stove and used steam to sterilize the jars, now, since I think this might be an actual do-able hobby, im thinking about buying a pressure cooker.(and also switching to agar, but that's a different story)

-I need opinions based on experience, what is a good brand of pressure cooker to buy for a relatively moderate price?

Get something of decent size. If you will be hot pouring agar plates from a sterilized agar vessel you need a cooker that will fit a suitable agar vessel, like a whiskey\liquor bottle. You won't be able to fit one in a small cooker. Something like an AA921, or if you are on a budget a Presto 23qt will work.

-Also, what are the do's and dont's/important RULES of pressure cooker use(like not letting the jars touch I think)

The jars can touch each other. NEVER force cool the cooker down from pressure by running cold water over it. NEVER yank the weight off while under pressure.

-is it ok to let the jars touch the bottom?

NO! The jars need to be on a canning rack in the pressure cooker. AA cookers all come with these racks, so does a Presto 23qt. If you don't have a rack you can use jar lids. If you can, it is better to have the jars completley out of the water. I accomplish this by using 4 ceramic pieces under the rack to lift the rack up further off the bottom and and knowing exactly how much water I need for the run. This takes some practice.

-what would be different from what I did using the boiling water in the pot on the stove?

Running a PC is a bit different than steaming jars. Read your manual for whatever cooker you get. Standard procedure in our application is to load the cooker up and set it on the burner on HIGH(not medium), when steam starts coming out the vent let it spew out for a few minutes, then apply the pressure weight over the vent at the 15psi setting. Once pressure gets up to 15psi and the rocker weight begins to rock, start the timer and then reduce the heat until it is just enough to maintain pressure and a consistent rocking of the weight. After pressure is reached on my AA921 and AA930, I back the heat to nearly off. This will take a little tweeking to find the "sweet spot" of your stove, but once you know where it is your good.




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Edited by Juiceh (05/24/15 07:05 PM)


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OfflinefirstTIMER420
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: mush madness]
    #21718570 - 05/24/15 07:18 PM (8 years, 8 months ago)

I think I saw that one, but what setting to run it on? I know there isn't a temp gauge on it im pretty sure

also, on average, how long does it take till it gets cool enough and also depressurizes enough to take the jars out.


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12 34 http://www.shroomery.org/forums/showflat.php/Number/22386794[/url]
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Edited by firstTIMER420 (05/24/15 07:27 PM)


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21718594 - 05/24/15 07:25 PM (8 years, 8 months ago)

In most cases, you will run 15 PSI (Which means 121C). This is usually set by adjusting the weight/valve to the proper setting and letting it run. The boiling point of water at various pressures will take care of the rest.


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Edited by matsc (05/24/15 07:26 PM)


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OfflinefirstTIMER420
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: matsc]
    #21718631 - 05/24/15 07:39 PM (8 years, 8 months ago)

ok guys, will update when I get one tomorrow probably..
im assuming wal mart is open on memorial day.


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Invisiblemush madness
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21718639 - 05/24/15 07:41 PM (8 years, 8 months ago)

Quote:

firstTIMER420 said:
I think I saw that one, but what setting to run it on? I know there isn't a temp gauge on it im pretty sure

also, on average, how long does it take till it gets cool enough and also depressurizes enough to take the jars out.






The presto 23 qt runs exactly 15 psi (don't have the 3 way weight like the AA ) and takes 30 to 35 min after I turn off the burner before the safty lock drops back down, leaving it on the burner not removing it to cool


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OfflinefirstTIMER420
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: mush madness]
    #21718676 - 05/24/15 07:54 PM (8 years, 8 months ago)

so should I leave it on the burner or take it off when im done with the 2hr mark?


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OfflineMasterPython
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420] * 1
    #21718690 - 05/24/15 08:02 PM (8 years, 8 months ago)

I really want to know why these things cost twice as much in Canada.


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Invisiblemush madness
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21718691 - 05/24/15 08:03 PM (8 years, 8 months ago)

Quote:

firstTIMER420 said:
so should I leave it on the burner or take it off when im done with the 2hr mark?




Leave it on

I do 60 min for quart jars
        90 for 1/2 gal
and 3 hours for large bags


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Offlinecr1s1s
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: mush madness]
    #21718747 - 05/24/15 08:25 PM (8 years, 8 months ago)

Yup, I can vouch for the 23Qt Presto that costs around 75 buckaroos. That's the one I use. I suppose it really doesn't matter as long as it can fit at least six quart jars in it at a time. Also, the guys above telling you to be sure to leave it so it cools down overnight are absolutely right. I cheated the first few attempts and didn't wait and every attempt contaminated with trich. The first time I let them cool naturally overnight resulted in effortless success.


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OfflinefirstTIMER420
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: cr1s1s]
    #21720999 - 05/25/15 01:47 PM (8 years, 8 months ago)

ok so the ones you can set and moniter the PSI are:
all American 23qt

and 23qt presto from Wal-Mart

any others that are maybe a little cheaper?


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Onlinerxb
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21721299 - 05/25/15 03:06 PM (8 years, 8 months ago)

the presto is like 60 bux, what do you expect to pay?


--------------------
->$10 FLOW HOOD ALTERNATIVE <-

. i cleaned a mold contaminated live culture and saved it. (might have useful applications)

[quote]Enlil said:
I'd be the guy with thousands of minions doing my bidding and all of the hot women locked in a cage for my use.[/quote]


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OfflinefirstTIMER420
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: rxb]
    #21721912 - 05/25/15 05:51 PM (8 years, 8 months ago)

its 79 at wal mart, I checked.
no need to be condescending, im just trying to get all my options, maybe look for a cheaper one that allows for control of psi


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Onlinerxb
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420] * 1
    #21721918 - 05/25/15 05:53 PM (8 years, 8 months ago)

it was an honest question sorry you took it as mean.

i guess i should have said "what are you trying to spend"


--------------------
->$10 FLOW HOOD ALTERNATIVE <-

. i cleaned a mold contaminated live culture and saved it. (might have useful applications)

[quote]Enlil said:
I'd be the guy with thousands of minions doing my bidding and all of the hot women locked in a cage for my use.[/quote]


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: rxb]
    #21721933 - 05/25/15 06:01 PM (8 years, 8 months ago)



--------------------
->$10 FLOW HOOD ALTERNATIVE <-

. i cleaned a mold contaminated live culture and saved it. (might have useful applications)

[quote]Enlil said:
I'd be the guy with thousands of minions doing my bidding and all of the hot women locked in a cage for my use.[/quote]


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OfflinefirstTIMER420
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: rxb]
    #21721938 - 05/25/15 06:03 PM (8 years, 8 months ago)

its all good man, thanks for the links.:thumbup:


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #21721946 - 05/25/15 06:04 PM (8 years, 8 months ago)

that all american is worth about 3 times that price btw

new its around $250 bux, and theres nothing that really goes bad on them thats not easily replacable.


--------------------
->$10 FLOW HOOD ALTERNATIVE <-

. i cleaned a mold contaminated live culture and saved it. (might have useful applications)

[quote]Enlil said:
I'd be the guy with thousands of minions doing my bidding and all of the hot women locked in a cage for my use.[/quote]


Edited by rxb (05/25/15 06:06 PM)


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: rxb] * 1
    #21722517 - 05/25/15 08:43 PM (8 years, 8 months ago)

You should also be aware that PCs generally are set to work at 15 PSI. So if find one without a monitor/adjustment, you can pretty safely assume it will be 15. Just means you wont be able to work at other pressures (Which is really isn't that often for general purposes)


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: firstTIMER420]
    #27347150 - 06/13/21 07:11 PM (2 years, 7 months ago)

Please reconsider using a pc/autoclave for anything "sterilizing" media.

Pc'ing is not meant to sterilize.

It kills the organisms in the media but the spores of many bacteria are simply unaffectef by pc'ing at 15 psi.

Commercial growers that use an autoclave/pc will 'sterilize' their media for 24 hours.

Their process destroys the nutrient profile of the media!

It's almost like people are allergic to nutrients. Whether it's the food they eat or the media they use for their mushrooms, they opt for the lowest quality substance they can get.

No wonder so many growers use coir. Which is basically wood fiber with less nutrients.

You will get less chance of contamination with a lower nutrient media especially if you are using dung to grow on.

However, it is not a necessity to pressure cook the media. It isnt even beneficial or an improvement over steaming.

The reason you can steam rice flour is because it is flour.

It is easily hydrated and hence more spores germinate in the media before you pasteurize it.

This works but pasteurization is outdated. The only reason the food industry still uses this method of food preservation is for economic reasons.

Time is money.

But for a hobbyist, efficiency is money.

A better technique to clean the media is to heat the media once a day to about 180f over the course of a week.

Yes, what i am saying is revolutionary. But this is the generation of revolutions.

If you listen to how the majority do anything,  you will fall from heaven in to hell.


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: annoyed]
    #27347183 - 06/13/21 07:42 PM (2 years, 7 months ago)

wut

no one sterilizes media for 24 hours, only substrates in a low/no pressure steam environment are done like that not media like agar or broths and those are plenty sterile at 15psi. Same exact techniques used in labs all across the world for all kinds of agar works not just mushrooms. Even tools used in surgeries. Your ideas don't really hold up to the real world.


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InvisibleThe Fresh PrintsS
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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: annoyed]
    #27347231 - 06/13/21 08:37 PM (2 years, 7 months ago)

I'd like to throw all of your posts in a pressure cooker at 15psi


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Re: PRESSURE COOKER USE FOR STERILIZATION [Re: The Fresh Prints]
    #27347255 - 06/13/21 09:04 PM (2 years, 7 months ago)

:kittylaugh:


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