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Invisiblejokefox
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pasteurization problems
    #13019108 - 08/07/10 09:12 PM (14 years, 5 months ago)

im not new to this
ive been using the oven tek for bulk for a while
im going to lay out my procedure
if someone can point something out that would be great

i mix my substrate (coco coir,perlite,verm,coffee grounds,and some gypsum(drywall)
and 2% straw , so i can see when everything is really mixed

i hydrate with 20%coffee and 80% water to perfect moisture content
then i stuff it all in a oven bag
(ill put as much as i can before it doesent fit in the oven)

i then set the oven on 170F
and wait for the center of the bag to hit 165-174
then start my 3 hour countdown

it always comes out smelling a bit wierd , but before when the bags got to 190 they smelt different (worse but never contaminated)

i checked my pan grow and my 3 cube bins. 5 days in
and they stick ,really bad
i think it could be trich

any suggestions :header:

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InvisibleDoc_T
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Re: pasteurization problems [Re: jokefox]
    #13019239 - 08/07/10 09:39 PM (14 years, 5 months ago)

Skip coffee.


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Invisiblejokefox
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Re: pasteurization problems [Re: Doc_T]
    #13019250 - 08/07/10 09:41 PM (14 years, 5 months ago)

that was my thoughts

fucking coffee fucking up grows

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InvisibleDoc_T
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Re: pasteurization problems [Re: jokefox]
    #13019261 - 08/07/10 09:43 PM (14 years, 5 months ago)

Only change one thing at a time per batch.
Eliminate coffee from one.
Leave coffee in, change temp.
Or try the water bath method RR uses.


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Invisiblejokefox
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Re: pasteurization problems [Re: Doc_T]
    #13019272 - 08/07/10 09:45 PM (14 years, 5 months ago)

i prefer oven style

but i can be sure its coffee fucking me up

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InvisibleDoc_T
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Re: pasteurization problems [Re: jokefox]
    #13019311 - 08/07/10 09:57 PM (14 years, 5 months ago)

Quote:

jokefox said:
i can be sure its coffee fucking me up




That sure, are you?


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Invisiblejokefox
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Re: pasteurization problems [Re: Doc_T]
    #13019322 - 08/07/10 09:58 PM (14 years, 5 months ago)

ya

everytime i use it something doesent work
last time i used straight horse shit and got 2 ounces
i guess i should have gone with my gut on the pan grow

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OfflineRogerRabbitM
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Re: pasteurization problems [Re: jokefox]
    #13019466 - 08/07/10 10:30 PM (14 years, 5 months ago)

Two things.

1.  Don't use the oven for pasteurization.  Use water as the heat-transfer media.

2.  Don't use liquid coffee in anything that doesn't get sterilized.  Liquid coffee will contaminate easily if it's not kept totally sterile until fully colonized.  Spent coffee grounds are OK in a bulk substrate, but not liquid coffee.
RR


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Invisiblejokefox
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Re: pasteurization problems [Re: RogerRabbit]
    #13019496 - 08/07/10 10:35 PM (14 years, 5 months ago)

like i said its the liquid coffee

RR i think the oven is good to go
because the middle of the bag does get to the right heat
and since the substrate is wet , water is still the heat transfer

besides i dont have a big enough pot to do the substrate
im not doing a little bitch 7 quart mono

im doing 30-45 quarts a time

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OfflineRogerRabbitM
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Re: pasteurization problems [Re: jokefox]
    #13019518 - 08/07/10 10:39 PM (14 years, 5 months ago)

Then go get a  bigger pot.  The oven takes too long to heat the substrate.  You want to heat it rapidly, and then keep the core at 140F for ninety minutes, no longer.  The oven is so slow, your substrate is too hot for too long.  You're partially sterilizing, which is making the substrate more susceptible to contamination, even without the liquid coffee.
RR


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Invisiblejokefox
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Re: pasteurization problems [Re: RogerRabbit]
    #13019524 - 08/07/10 10:41 PM (14 years, 5 months ago)

that makes a lot of sense

can i use oven bags for the pot still
or should i use a pillow case

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Invisiblewygram
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Re: pasteurization problems [Re: jokefox]
    #13020041 - 08/08/10 12:43 AM (14 years, 5 months ago)

That is a matter of preference.

I find it easier to mix everything and moisten to field capacity before loading into water proof oven or spawn bags for pasteurization.


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Re: pasteurization problems [Re: wygram]
    #13020528 - 08/08/10 05:44 AM (14 years, 5 months ago)

I'm with wygram on this one,bring to field capacity and then use your oven/autoclavable bags.


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InvisibleFractalXplora
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Re: pasteurization problems [Re: Mad_Hatter2004]
    #13020554 - 08/08/10 06:12 AM (14 years, 5 months ago)

you simply cant go wrong with water at 170oC, pour onto sub, chuck it in a big bucket lid on 2 hours? will pasterize perfect every time and sit at 150 for ages!

:shrug: forget the oven, too expensive and pointless:)


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OfflineMad_Hatter2004
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Re: pasteurization problems [Re: FractalXplora]
    #13020566 - 08/08/10 06:19 AM (14 years, 5 months ago)

Quote:

FractalXplora said:
you simply cant go wrong with water at 170oC, pour onto sub, chuck it in a big bucket lid on 2 hours? will pasterize perfect every time and sit at 150 for ages!

:shrug: forget the oven, too expensive and pointless:)




Sure you can.For coir/vermiculite the boiling water in a bucket method works great,but that's because coco coir is pretty dam resistant to contamination (unless your coir was treated with trich).

Try the boiling water bucket method on some horse poo...I will almost guarantee a fail.


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InvisibleFractalXplora
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Re: pasteurization problems [Re: Mad_Hatter2004]
    #13020589 - 08/08/10 06:40 AM (14 years, 5 months ago)

Quote:

Try the boiling water bucket method on some horse poo...I will almost guarantee a fail.




dude i always do this method it with straight horse poo and verm, sometimes poo/coir/verm/coffee mix, never had any problems. Surley the sub medium doesn't matter?!?:thumbup:


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OfflineMad_Hatter2004
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Re: pasteurization problems [Re: FractalXplora]
    #13020651 - 08/08/10 07:24 AM (14 years, 5 months ago)

Quote:

FractalXplora said:
Quote:

Try the boiling water bucket method on some horse poo...I will almost guarantee a fail.




dude i always do this method it with straight horse poo and verm, sometimes poo/coir/verm/coffee mix, never had any problems. Surley the sub medium doesn't matter?!?:thumbup:




I don't know man,seeing as how coir is pretty damn resistant to contamination,but things like poo,if you don't properly pasteurize,they will contaminate with the ease.

I am not saying it hasn't worked for you,but I wouldn't go around advising people to use the boiling water method with substrates such as poo,coffee,etc.

Those substrates are best left to be properly pasteurized.


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InvisibleFractalXplora
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Re: pasteurization problems [Re: Mad_Hatter2004]
    #13020683 - 08/08/10 07:50 AM (14 years, 5 months ago)

Quote:

Those substrates are best left to be properly pasteurized.




As of course they are! I check with meat thermoter every half hour sits between 140- 160 absolutly no problems, which in essence in a proper pasterization. So I am gonna advise it as it always works a treat.:tongue2:

No waiting for the sub center to reach the right temps, 3 hours in an oven.!/!? That seems like a dodgy method to me, plus expensive.


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InvisibleNuminosum
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Re: pasteurization problems [Re: FractalXplora]
    #13020798 - 08/08/10 08:36 AM (14 years, 5 months ago)

Quote:

FractalXplora said:
you simply cant go wrong with water at 170oC, pour onto sub, chuck it in a big bucket lid on 2 hours? will pasterize perfect every time and sit at 150 for ages!

:shrug: forget the oven, too expensive and pointless:)





Can you explain to me how you have water at 170 deg C?


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InvisibleFractalXplora
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Re: pasteurization problems [Re: Numinosum]
    #13020866 - 08/08/10 09:03 AM (14 years, 5 months ago)

Quote:


Can you explain to me how you have water at 170 deg C?




Cause when you add it to the cold straw the temp drops 5-10 degrees quite quickly, give it ten minutes and you'll be sitting pretty at 160 to 140oC easy for 2 hours, if it goes too low, boil a kettle and dump it in to bring it back up.:thumbup:


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