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jawache
Stranger
Registered: 04/29/21
Posts: 2
Last seen: 3 years, 6 months
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Why do my grain jars have a vacuum?
#27286505 - 04/29/21 11:42 AM (3 years, 8 months ago) |
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New to growing, the second batch of grain jars I've made. This batch had a vacuum after PC (and cooling) when I stuck the syringe in it sucked the whole 10CC out in one go!

I cracked open the lid and it was a tight vacuum, is my blue syringe filter broken? I was under the impression it would let air in as it cooled etc... I do see growth but feels very slow so far.
The first batch of jars were fine, no vacuum and the mycelium is growing well, wondering what I did wrong for the second batch to make the vacuum.
Oh the one thing I did do differently in the second batch is that I forgot to cover them with foil in the PC so some water may have gotten into the syringe filters. Do you reckon that was it? Or did I mess up how I made the jar lids.
Cheers!
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Professor X
School for the Gifted



Registered: 04/18/19
Posts: 2,719
Last seen: 3 years, 3 months
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Re: Why do my grain jars have a vacuum? [Re: jawache]
#27286546 - 04/29/21 12:17 PM (3 years, 8 months ago) |
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That's a liquid culture gas exchange filter. That's not for grain jars. Your jar will stall if you use that lid. IF you opened a jar under vacuum not in front of a flowhood it's probably already toast anyways, you sucked in contaminants when you opened it.
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jawache
Stranger
Registered: 04/29/21
Posts: 2
Last seen: 3 years, 6 months
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Re: Why do my grain jars have a vacuum? [Re: Professor X]
#27288650 - 05/01/21 04:03 AM (3 years, 8 months ago) |
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Ahh, interesting thanks!
The first non-vacuum batch kinda stalled now that you mention it, they colonised most of the jar but just stopped at like 2/3.
They did advertise it for grain jars but let me reach out to the people I bought it from and ask: https://archersmushrooms.co.uk/product/13mm-0-22um-syringe-filter/
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myc_ousin_vinny
Keeping_It_Real



Registered: 04/29/20
Posts: 1,417
Loc: United States
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Re: Why do my grain jars have a vacuum? [Re: Professor X]
#27288745 - 05/01/21 06:49 AM (3 years, 8 months ago) |
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Hey Professor X. Why would that gas exchange filter not provide enough ge for grains?
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,387
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It's fine plenty of rascals with gadgety ways have those syringe filters on grain lids. Not that I would recommend it, I'm a easy polyfil guy.
Yours is plugged up or otherwise not working if it held a vacuum in the jar.
Edited by sandman420 (05/01/21 07:19 AM)
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,915
Loc: Milky way
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Quote:
myc_ousin_vinny said: Hey Professor X. Why would that gas exchange filter not provide enough ge for grains?
Its a syringe filter. Requires pressure for gas/liquid to pass thru. Not really a gas exchange filter.
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,387
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Re: Why do my grain jars have a vacuum? [Re: bodhisatta]
#27288839 - 05/01/21 08:24 AM (3 years, 8 months ago) |
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Looking at the silicone dollop under it I'm betting you accidentally nicked a little silicone inside the connector when putting it on the lid and plugged it up.
I've certainly seen a few people using them over the years. Probably the worst of available filters but I've seen it work.
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