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Shop: Mushroom-Hut Substrate Mix   Unfolding Nature Unfolding Nature: Being in the Implicate Order   North Spore Bulk Substrate

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Re: Sterilizing With A Nukrowave
    #68570 - 12/15/99 07:44 AM (23 years, 11 months ago)

You can put your casing material in a microwave safe pan, (big enough to hold what you need), microwave on high for 8 to 10 minutes. It will be sterile. What the high heat does'nt kill the radiation will. I use this method most of the time and no problems. Hope this helps you.

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Re: Sterilizing With A Nukrowave
    #68572 - 12/15/99 03:03 PM (23 years, 11 months ago)

just make sure you include a pan of glass of water, otherwise all the water in your casing mix gets evaporated away, and your mix will dry out.

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Re: Sterilizing With A Nukrowave
    #68573 - 12/15/99 03:13 PM (23 years, 11 months ago)

And what about sterilizing glass jars and substrate? Is it okay to put plastic wrap on the jars and then sterilize the lids seperately, and then take off the wrap and put the lids on real fast? :smile:

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Registered: 01/05/99
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Re: Sterilizing With A Nukrowave
    #68574 - 12/15/99 06:33 PM (23 years, 11 months ago)

The ideal way to sterilize substrate jars is obviously in a pressure cooker! So what you do is get a 22 litre industrial job at huge cost, put your dozen jars at a time in, and after their twenty minutes of 120 degrees centigrade heat and eight hours cooling - there you are, sterile growth containers. Guess what? That just isn't going to happen, at least not in my house. It is just a huge expensive piss about, probably worth it but it ain't going to happen. Similarly you could use a standard pressure cooker three jars at a time, that is if you want to waste a whole day between cooking cooling and extracting the goods, how strange, that one's also a no hoper. So what is left? Well I personally use microwave sterilisation of plastic jars, and while I have had occasional problems - the sterility of my substrate was generally not one of them. Now you might think that microwaving is easy, and it is - just remember that these containers are not baking potatoes so ten minutes on full power will mainly generate farting 'n' fireballs as well as stinking the place up and causing a mess- so lets avoid that one. How I do it is:- Put your vermiculite in a decent sized bowl and sprinkle the required amount of water on it (hot water goes in more easily and hydrates the rice flour quicker) then sprinkle some of the brown rice flour on the top, the mix is then forked over until the flour disappears, keep at this until all the flour is mixed in. Next pop the bowl in the microwave and give it a minute at medium power, out it comes and fork it over, keep this up till the steam fogs your sunglasses and the consistency seems loose and even. At this point you will have performed the optional pre-sterilisation stage, cooked and mixed the flour in and been able to check if the mix is too heavy. At this point you can sort it by adding some more vermiculite. Next, you fill the jars to near the top and start to arrange them evenly round the turntable in the microvave ( I find that I get eight round the rim and one in the middle, so I do them in batches of nine). Next you give it about a minute at a time of highish power until again the mix is steaming hotly and presumably fairly sterile. The jars are then topped off with a little vermiculite for a seal and the lids are placed on the tops tight, You should have the innoculation holes allready in place as these allow the hot mix to breathe and stops the lids from popping off messily. Now the best bit - You once more give the jars about a minute of highish power, open the door and turn the jars a bit for even heating and then blast them some more. You keep this up until you can feel that the jars have become difficult to touch through the heat - so give them one last turn as they are nearly ready and leave the door closed. Doing the heating this way allows you to check the heat is about right and allows it to soak in evenly so as to give good sterility coverage. Now, pressure sterilization at 120 degrees centigrade takes about twenty minutes but at the lower and less violent temparatures of the microwave it takes longer, fortunately the zap and check method keeps the jars hot for quite a while - combined with the slow cooling of a clump of jars in the microwave they should be well cooked without mess. A further benefit is had by the naturally sterile nature of the inside of the microwave having very little cr@p for the cooling jars to suck in. I find that while this method is not perfect, it is very good and gives consistently usable results with very little effort or spoilage after innoculation. The only thing you want to avoid putting in is metal bits - for obvious reasons.

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Registered: 11/02/99
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Re: Sterilizing With A Nukrowave
    #68575 - 12/15/99 06:42 PM (23 years, 11 months ago)

I just want to point a few things out...when it comes to casing you dont want to sterilize it this actually kills off helpful bacteria.....instead pasturizeing is what to do...or dont even worry about it and just case your shrooms without any pasturization.(I just tried my first casing unpasturized and so far so good.)

Now pasturization can be done in the oven or the stove top.

Stove top

take an old pillow case(or something like it fill with your casing,....take a large pot and fill just enough so the pillow case is and will stay covered by the water......when the water temp reaches 160-170F you will need to leave it in there for 1-2 hours 1hour 15 min. at 170F will do great


take a large enough oven safe dish plate or what ever will hold the amount of casing you need fill with casing saturated to 90% its holding capacity cover with tin foil and follow the temp and time as stated above.....

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" My mind dont work if my spine dont jerk!"

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