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Offlineredshadow
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Filter Options
    #26821901 - 07/13/20 09:14 PM (3 years, 6 months ago)

Has anyone tried cutting small pieces of HEPA or Merv-16 filters for air filtration when making jar lids? I dont know if they can handle the heat of the pressure cooker. What do you guys think?


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InvisibleHobbit GDF
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Re: Filter Options [Re: redshadow]
    #26822042 - 07/13/20 10:23 PM (3 years, 6 months ago)

Anytime my old hepa get touched they shred like toilet paper but even softer


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Offlinemushpunx
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Re: Filter Options [Re: Hobbit GDF]
    #26822223 - 07/14/20 12:49 AM (3 years, 6 months ago)

Sounds like way more trouble than it's worth.

Hands down the very best filters IMO are plastic lids (I prefer the "autoclavable plastic lids" you get from cultivation sites over the plastic storage caps for Mason jars like Ball/Kerr, they can sometimes warp over time) with a 1/2-1" hole drilled, and either an uncut SFD popped up underneath, or stuffed with poly fill.
Plastic lids don't rust like one piece.

The autoclavable plastic lids are only like $4 for 10, or $20 for 100.
The good quality SFDs last forever and they normally cost like $1 each for 10 or 50¢ a piece if you buy a case of 100.
And if you don't want to buy that many SFDs at once you can just get a set for your grain masters and use polyfill on the receivers.

So quick and easy , you just drill a hole.




(Those are gallon jars/lids in the pics. The first pic is 70mm lids next to a 110mm lid for a gallon jar with the SFD popped in. They fit tight. I use 1" holes on my gallon jars now."

I just started using wheel filters on my lids for liquid cultures to make them spill proof. Super easy just drill a 5/32" hole and pop one in. No silicone or anything, it's water tight. You can add a self healing rubber injection port too if you want, just drill a 1/2" hole and pop that in. I don't use them though, seem risky to me.



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Edited by mushpunx (07/15/20 12:44 AM)


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Offlineredshadow
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Re: Filter Options [Re: mushpunx]
    #26822252 - 07/14/20 01:32 AM (3 years, 6 months ago)

I used to use polyfill and had one first successful grow and they rest were riddled with contams.

I too love the pre-made filters but trying to save a few bucks ans use something that breathes a little better than tyvek.

I totally agree with the plastic lids, the tin ones degrade super fast and are a bitch to keep from rusting.

I actually have plastic lids now with pre-made air filter holes but like i said looking into cheaper solicitous and have PTSD from polyfil lol.


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Offlinemushpunx
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Re: Filter Options [Re: redshadow]
    #26823676 - 07/14/20 06:27 PM (3 years, 6 months ago)

Polyfill > Tyvek. I'm not the biggest fan of Tyvek. Unless you had the poly like ridiculously loose or something I seriously doubt it was lid failure.
If a lid fails, you'll know it, often there will be green mold only right at the top of the grain.
What did you use as inoculant ; spores, agar, LC?

If you want to try something other than Tyvek though, people have been having sucess with micropore tape (from the first aid isle) , not sure if they use one or two layers. I've never tried it except on PP5 agar plates. It just sticks on the lid over the hole.

What hole size do you use? If you want more GE you can always increase hole size some or add another hole.
I use 1/2" on quart jars.


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InvisiblePastywhyteMDiscord
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Re: Filter Options [Re: mushpunx]
    #26823712 - 07/14/20 06:48 PM (3 years, 6 months ago)

My favourite filter for plastic jar lids is having no filter at all. Doesn’t get much easier than that and I’ve yet to have a contam I can attribute to using unmodded lids.


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Offlineredshadow
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Re: Filter Options [Re: Pastywhyte]
    #26823985 - 07/14/20 09:14 PM (3 years, 6 months ago)

YES, that godforsaken green shit. I had contam issues with BRF cakes and was using spores. I had contams only during the spawn run the cakes that survived did fine on on FC with no prob.

Back then i was using the shitty tin lids, maybe the rubber seals were going bad? Other than the air filers, i cant think of anything else that could have gone wrong.


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InvisibleHobbit GDF
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Re: Filter Options [Re: redshadow]
    #26824069 - 07/14/20 09:55 PM (3 years, 6 months ago)

This is super cheap and it's at walmart for like 5$. 100%polyester just like polyfil. It's kinda flexible and it settles once PC into firm. It's for sewing and stiffing clothes.

On a budget this is the shit. It's like same thickness as sfd. It stiffens after PC cycle so it gets better I think. I use one layer sometimes with success and 100% success with 2 layers. I lose like 1/15 with one layer or it was my fuckup but this stuff works and I know because I've tested it to be true


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Offlinemushpunx
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Re: Filter Options [Re: Pastywhyte]
    #26824249 - 07/15/20 01:14 AM (3 years, 6 months ago)

Quote:

Pastywhyte said:
My favourite filter for plastic jar lids is having no filter at all. Doesn’t get much easier than that and I’ve yet to have a contam I can attribute to using unmodded lids.




I actually have a set of plastic lids I haven't modified yet, I wanna give this a shot I think. How loose do you leave the cap? And when you PC you still cover with foil yes?

Sometimes after inoculating my grain masters I wrap the edge of the cap/jar with parafilm to keep the rim cleaner for G2G.
Think it would inhibit GE too much to do that with unmodded lids?


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InvisiblePastywhyteMDiscord
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Re: Filter Options [Re: mushpunx]
    #26824649 - 07/15/20 08:43 AM (3 years, 6 months ago)

I usually cover them in foil but I’ve done without as well. Not super loose, maybe a 1/4” off of finger tight. The big thing to remember is to tighten the lids up before you pick them up and handle them and loosen them when you put them back.


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InvisiblemushboyMDiscord
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Re: Filter Options [Re: Pastywhyte]
    #26824657 - 07/15/20 08:47 AM (3 years, 6 months ago)

I just screwed them tight after pcing and after inoculation. I don't think the threads are airtight anyway.

Worked fine:shrug:

Mind the dildo.


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InvisiblePastywhyteMDiscord
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Re: Filter Options [Re: mushboy]
    #26824672 - 07/15/20 08:54 AM (3 years, 6 months ago)

Yeah the lids definitely don’t seal airtight. Also I minded the dildo.


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InvisiblemushboyMDiscord
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Re: Filter Options [Re: Pastywhyte]
    #26824675 - 07/15/20 08:55 AM (3 years, 6 months ago)

It's the only pic I got of a colonized jar w/plastic lid:blush:


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OfflineGan
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Re: Filter Options [Re: mushboy]
    #26824749 - 07/15/20 09:35 AM (3 years, 6 months ago)

You remember where you got those particular lids, mushboy?

I just received some ball brand plastic lids and they're not viable for unmodded. They barely turn a quarter of a turn once the threads catch so they're pretty loose even when cranked down. Gonna have to source some more cause I wanna test out unmodded lids


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InvisiblemushboyMDiscord
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Re: Filter Options [Re: Gan]
    #26824792 - 07/15/20 09:50 AM (3 years, 6 months ago)

Lord bezos.

Quote:

Gan said:
They barely turn a quarter of a turn once the threads catch so they're pretty loose even when cranked down.





Sounds perfect:shrug:


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OfflineGan
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Re: Filter Options [Re: mushboy]
    #26824890 - 07/15/20 10:39 AM (3 years, 6 months ago)

Oh okay haha. Didn't know that would work. First real introduction to plastic lids. In that case, you think I need to loosen them at all for colonization? Cause anything more than a quarter turn from full tightness and they essentially fall off.


As to OP, yeah I normally have used poly or SFD's. Trying some unmodded lids today as well.

Edit: nevermind, you said above that you tighten them all the way with no issues lol


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Edited by Gan (07/15/20 10:41 AM)


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InvisiblemushboyMDiscord
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Re: Filter Options [Re: Gan]
    #26824903 - 07/15/20 10:45 AM (3 years, 6 months ago)

Try em and see. I'd just leave em 'tight'. If the looseness bothers you, you can always wrap the screwed on lids in saran/parafilm.


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Offlinemushpunx
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Re: Filter Options [Re: Gan]
    #26824954 - 07/15/20 11:20 AM (3 years, 6 months ago)



My lids come from FP. They're definitely water tight, I dunno about air tight.
I just checked them out, they seem great for this - even the 110 mm caps for my gallon jars.
I think I'll give it a proper try, it obviously works well and simple is good. :thumbup:

Curious why it works though, does outside air enter the jar or are gases just being pushed out ?


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Invisiblenatedawgnow
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Re: Filter Options [Re: mushpunx]
    #26824963 - 07/15/20 11:24 AM (3 years, 6 months ago)

In the jar, gases are being pushed out. Air is not intended to enter the jar freely.
That's the difference between gas exchange and fresh air exchange.

Co2 is produced by the myc and as it builds up it gets pushed out the filter.
This is my understanding at least.


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InvisiblePastywhyteMDiscord
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Re: Filter Options [Re: natedawgnow]
    #26824973 - 07/15/20 11:29 AM (3 years, 6 months ago)

Quote:

natedawgnow said:
In the jar, gases are being pushed out. Air is not intended to enter the jar freely.
That's the difference between gas exchange and fresh air exchange.

Co2 is produced by the myc and as it builds up it gets pushed out the filter.
This is my understanding at least.




I believe you’re correct. Colonizing mushrooms don’t need a lot of O2 but too much CO2 is detrimental to the colony.


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Offlinemushpunx
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Re: Filter Options [Re: Pastywhyte]
    #26824980 - 07/15/20 11:35 AM (3 years, 6 months ago)

Quote:

Pastywhyte said:
Quote:

natedawgnow said:
In the jar, gases are being pushed out. Air is not intended to enter the jar freely.
That's the difference between gas exchange and fresh air exchange.

Co2 is produced by the myc and as it builds up it gets pushed out the filter.
This is my understanding at least.




I believe you’re correct. Colonizing mushrooms don’t need a lot of O2 but too much CO2 is detrimental to the colony.




Ah, this makes sense guys.

This is essentially how I understood it as well but I guess I had always kind of assumed that small amounts of O2 entered thru our filters

Thanks!


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InvisiblePastywhyteMDiscord
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Re: Filter Options [Re: mushpunx]
    #26824989 - 07/15/20 11:38 AM (3 years, 6 months ago)

Small amounts of O2 probably do enter but it’s not what is critical AFAIK.


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Invisiblenatedawgnow
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Re: Filter Options [Re: mushpunx]
    #26824995 - 07/15/20 11:39 AM (3 years, 6 months ago)

I'm sure small amounts do, but they aren't intended to.

I'm sure room pressure and air currents push air and contams through filters
all the time, but their intention is to allow gas out of the jar while providing
protection from such air currents and their spore load


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Re: Filter Options [Re: natedawgnow]
    #26825225 - 07/15/20 01:13 PM (3 years, 6 months ago)

Right on, makes sense.

I'm all excited to use these lids this way now! I'm glad I have a bunch without holes. I've done bottle grows with unmodified lids many times but not spawn with the plastic caps.

It's funny when I started out with grains I originally just flipped the lid upside down and loosened the band.


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Offlineredshadow
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Re: Filter Options [Re: mushpunx]
    #26825798 - 07/15/20 07:12 PM (3 years, 6 months ago)

Thanks for the tip Hobbit GDF! That sounds like an nice option i will look into.

@ mushpunx, Pastywyte is correct some tin foil over the top should be good. i used to secure them with rubber bands casue when i first started they would fall off, but if you crimp the shit out of them along the edges of the lid they should be fine.


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