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OfflineIvan
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Registered: 06/21/03
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My Bag
    #2083055 - 11/08/03 04:48 AM (13 years, 3 months ago)

Heres a cheap and effective way to make your own grow bag.

Growing in autoclavable bags.
This is the natural next step for any mushroom grower that has been using jars with success.

The materials you need to do this are
a piece of foam rubber
The top of a plastic bottle (cap and all) (thicker the better)
An oven bag or any other bag that can be pressure cooked.
Surgical gauze pad
Rubber Bands
Your favorite substrate
Plastic cling wrap
Tin Foil.


Pretty simple to set up.
First pre moisten your substrate.
fill the bag to 1/3rd

Drill a hole in the plastic cap.
put the top of the bag through the drilled hole.



Cut a circle of foam a bit bigger then the neck of the bottle neck for a good fit. Screw the cut off bottle neck into the cap with the bag between, try to make a clean fit.



Put the foam plug in the neck.




Now take your gauze pad and secure it to the bottle neck with a ruber band.


I wrap the filter with tin foil before Pressure cooking to prevent it from getting soaked.

Now Pressure cook your bag and inoculate by injecting it through the filter. Yes through the filter!, the foam is self healing.

Thats it.

I have used this a number of times with great results. Once the bag is ready either break it up in a tray and case or cut of the top of the bag, case and fruit..





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Offlinezeronio
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Re: My Bag [Re: Ivan]
    #2083061 - 11/08/03 04:51 AM (13 years, 3 months ago)

Nice pictorial! I think this could go into the FAQ section.


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OfflineIvan
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Re: My Bag [Re: zeronio]
    #2083075 - 11/08/03 05:00 AM (13 years, 3 months ago)

Thanks Zeronio,
The process is simple and cheap this is why I like it. The science behind it is that the foam rubber works as a micron filter and is re-usable. It also reduces the contamination vectors by being already sealed post PC'ing. The filter can be inproved by making 2 plugs. 1 higher density foam on the bottom and 1 lower density on top.


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Offlinezeronio
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Re: My Bag [Re: Ivan]
    #2083081 - 11/08/03 05:09 AM (13 years, 3 months ago)

I'm going to try it.
How does the top of a plastic bottle whitstand sterilization?
I thought they were mostly made out of polyethylene.
Here is a description of similar bag tek that uses cotton plug filter:



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OfflineIvan
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Re: My Bag [Re: Ivan]
    #2083175 - 11/08/03 06:48 AM (13 years, 3 months ago)

It holds up pretty well. After 5 sterilization sessions the cap still fits the neck and creates an airtight seal.
The top of the bottle neck is a thicker grade plastic then the body.
So it is important to cut it at the neck, just above the lip so that the tube part is exposed.

Mineral water bottles with gas are pretty tough.



I cut at the border of the thick and thin part of the bottle.



Trim so I have a tube



Thats it


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OfflinePaid
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Re: My Bag [Re: Ivan]
    #2083489 - 11/08/03 11:17 AM (13 years, 3 months ago)

excallent :]
i go about it a slightly different way but
very simular :]


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OfflineIvan
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Re: My Bag [Re: Paid]
    #2083603 - 11/08/03 11:59 AM (13 years, 3 months ago)

Very cool Paid,
Looks like we were thinking on similar lines :-)


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OfflineISH
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Re: My Bag [Re: Ivan]
    #2085386 - 11/08/03 11:19 PM (13 years, 3 months ago)

Nice Idea


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OfflineIvan
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Re: My Bag [Re: ISH]
    #2089847 - 11/10/03 05:38 PM (13 years, 3 months ago)

Something I wanted to add

The micro-filter on the bag is vital for the exchange of gas and keeps the contaminates out.
Problem is that when sealing after pressure cooking, the bag is exposed to contaminates in the open air that fall on the cool parts of the bag.
The substrate is still to hot to harbour new vectors but the sides of the bag are not so many times I was creating biological timebombs doomed to turn green.
I am working on a surgical steel version of this type of filter seal and if all goes well I will post soon on the results.


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Offlinezeronio
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Re: My Bag [Re: Paid]
    #2091082 - 11/11/03 02:14 AM (13 years, 3 months ago)

Yes I know Paid is also using the same bag making method which is described also in Stamets GGMM. My problem was that I was looking for polypropylene tubes.
I tried PE bottle necks yesterday and they didn't melt. Autoclaving had some effect on their form but they're good enough.  :laugh: 


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OfflinePaid
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Re: My Bag [Re: zeronio]
    #2091157 - 11/11/03 02:48 AM (13 years, 3 months ago)

I using some hotwater pipes (pvc) heated and pinched at one end, to
hold in a pollyfiltre ball, this holds up well to pressure cooking,
and is a simplar more sourcerbal method than my unit legs :]
I'll update my thread if these oysters make it all the way
without contams :grin:
Oh, and cable ties = key 


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OfflineIvan
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Re: My Bag [Re: zeronio]
    #2091199 - 11/11/03 03:08 AM (13 years, 3 months ago)

Its important to get as thick a bottle neck as possible.
All bottles are not created equaly. I've had the best results with the better brands of mineral water. But there are some brands of beer that come in plastic bottles with really tough plastic.
The key to this is the foam. Even if the neck deforms a bit, the foam keeps the seal to the outside world. And I never have any problems with the thread part not fitting after PC'ing.
Good luck Z


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Offlineragadinks
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Re: My Bag [Re: zeronio]
    #2092065 - 11/11/03 12:58 PM (13 years, 3 months ago)

My problem was that I was looking for polypropylene tubes.

zeronino, have found some cheap supply of polypropylene tubes yesterday, when I was passing our graveyard. They use PP for the outside of the candles on the graves. I have already autoclaved it for 40 minutes at 125?C and there was no problem. Today I have put it on a bag - hope it works.

Here is a picture of the candles:



Here I have put the mycobag through a ring to the cut candle:



In the hole there goes some cotton and then the whole is fixed with the former top of the candle:




Hope that it's going to work.


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OfflineIvan
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Re: My Bag [Re: ragadinks]
    #2092647 - 11/11/03 03:26 PM (13 years, 3 months ago)

The sleeves look pretty good I don't see why they won't work.
Try foam rubber, you will get better results .


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Offlineragadinks
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Re: My Bag [Re: Ivan]
    #2094616 - 11/12/03 12:26 AM (13 years, 3 months ago)

Try foam rubber, you will get better results .

What is foam rubber ? I have never seen that before, or at least I do not recognize it from the pictures. Where do you get if from ?


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OfflinePaid
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Re: My Bag [Re: ragadinks]
    #2095223 - 11/12/03 02:53 AM (13 years, 3 months ago)

sponge = foam rubber


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Offlineragadinks
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Re: My Bag [Re: Paid]
    #2095332 - 11/12/03 03:19 AM (13 years, 3 months ago)

Quote:

Paid said:
sponge = foam rubber




Oh, thanks. I did not recognize it from the picture. Could not imagine that it can be PC'd.


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OfflinePaid
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Re: My Bag [Re: ragadinks]
    #2095598 - 11/12/03 05:28 AM (13 years, 3 months ago)



This is the filter i stole the idea from :]
I handles pressure cooking or mocrowaving, and is
the only one i have :[ I got it from an oyster kit i bought, and
havent been able to source this exact model yet :[ as if
i could find them, i would buy at least 100 :]

:wink: if your looking mycobag, get some in :tongue:


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Offlineragadinks
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Re: My Bag [Re: Paid]
    #2095681 - 11/12/03 05:56 AM (13 years, 3 months ago)

Cool :thumbup:
Where do you get the bags from ? 


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InvisibleJoshua
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Re: My Bag [Re: Paid]
    #2095727 - 11/12/03 06:10 AM (13 years, 3 months ago)

Foam rubber is a polyurethane foam, while sponges are either made by animals or from cellulose.

I don't think I would have thought about using foam rubber as a filter. According to this reference it can withstand temps up to 350 F


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