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mrmazdarx9
Pffffttt


Registered: 05/15/16
Posts: 9,796
Loc: behind you
Last seen: 1 year, 4 months
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Probably but that would be really expensive and alot of fuss could just buy sfd's for the same price.
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blackout


Registered: 07/16/00
Posts: 5,266
Last seen: 2 months, 25 days
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Re: filter choice for jars [Re: mrmazdarx9]
#23970954 - 12/31/16 02:18 PM (7 years, 30 days ago) |
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Quote:
mrmazdarx9 said: Its more about him saying leaving the lid unscrewed is no different to taking it off as contaminates are microscopic. also I love how mushie rage runs for the hills when RR cuts his suggestion down I love mushierage
mushierage gave a decent reply with a link to Pasty's thread, RR is the one with no subsequent reply which is unfortunate, it is hard to tell if he is exaggerating things or not at times. I doubt he really does think its the exact same as no lid, and if pushed on the point might admit its not.
If your room has high airflow or drafts, e.g. near a door which gets opened a lot, then contams could make it up and past the threads. The whole idea is to give them a "torturous path" so they cannot easily drift into the jar.
Have a look at this old sketch of a version of a "still air box" which John Tyndall had.

You can see at the top of the box there are 2 open tubes with no filter, but they go up and down. This makes it hard for contams to get in as they would have to drift up and down all the way to get inside. If you blew into them of course it could make it in, but it is enough for gas exchange to happen.
Tyndall also used glycerine smeared on the walls in this SAB so contams would stick to it. I mention using this idea in Pasty's thread
Quote:
blackout said:I had sealed unfiltered food jars with regular size metal lids colonising which were only 1/4 full with popcorn grain. I wanted to see if they could colonise with no filter or cracked lid. They stalled at about 70%. I guess there is a certain ratio where there would be enough initial air to colonise 100%.
As the lids were regular, and as my room is prone to contams I did not just want to crack the lid. I sprayed surface disinfectant on the jars lids & upper side walls and put semi transparent sandwich bags over them. When on the jar I smeared the bags against the still wet jars to disinfect the inside of the jar. While still wet I got some petroleum jelly (vaseline) and lifted up the bags a bit and smeared the jelly around the top of the jars neck. Again I wiped the bags around the jars so the inside of the bag was also coated in petroleum jelly. I then unscrew the lid and pull the bag away from the jar a little to make sure it is not making a sealing with the jar with the vaseline.
This was an idea from reading that John Tyndall smeared the wall of his SAB type box with glycerine, the idea being that airbourne contams would stick to the glycerine and it would not dry out like a wall misted with water would.
So the petroleum jelly is doing the same thing. If any contams do get in under the bag they will hopefully stick to the bag or the outside of the jar before they manage to get in. The bag itself might be enough, rather than the mess and small expense of the vaseline.
The jars got to 100% a few days after this. I like the idea of still letting them grow out a bit with lids screwed on so it can be a bit colonised and hopefully resistant if any contams do manage to get in.
If you have questionable filters on your jars I would recommend sticking a bag on them like this. I have filters I am pretty sure are OK but now like to use the bags as a secondary measure.
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