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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Persistent white mold problem
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Old 09-05-2013, 02:40 AM   #1
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Default Persistent white mold problem

I've been having an increasing rate of white mold. It usually pops up in secondary, but I've noticed that even if I leave a half beer sitting around it will skin over within a day or two. Is there any way to treat the basement as a whole instead of just bleaching/sanitizing the carboy?


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Old 09-05-2013, 02:43 AM   #2
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I don't know of any way to treat your house. You can step up your sanitation on the carboy/equipment to get rid of the mold in the beer, though.

Get rid of any plastic (like tubing) and buy new and sanitize well. Instead of doing a "secondary" (clearing vessel), try using just a single fermenter (as keeping oxygen out will prevent mold) and then packaging on about day 10-14, or when the beer starts to clear and has been finished fermenting for at least 3 days.


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Old 09-05-2013, 03:35 AM   #3
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maybe a dehumidifier?
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Old 09-05-2013, 04:37 AM   #4
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White skin? That sounds like a pellicle. Any pics?
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Old 09-05-2013, 11:59 AM   #5
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Maybe get a mold specialist to inspect your basement.

If you're doing lacto based fermentations alongside (yogurt, cheese) in the same place, that may also be the source of the airborne critters that seem to share your living space.
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Old 09-05-2013, 08:43 PM   #6
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White skin VERY MUCH sounds like pediococcus. If you have a friend with a microscope check it out under the microscope; short round rods in pairs or chains is pedio.

The most common infection vector is fruit flies.

-What do you use to sanitize your equipment? (Pedio is VERY tolerant of acids so if you're just using starsan, you'll want to try something else to get rid of pedio; strong solution of hot PBW + an oxygen-based sanitizer should be more useful against pedio; iodine sanitizers should work too but the alkaline ph of PBW is my personal preference for pedio.


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Old 09-05-2013, 09:30 PM   #7
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Do you mill your own grain and, if so, in the same area you are fermenting and transferring your beer? I ask because I ran into the exact same issue this summer when I had to move all of my fermenting beer down to the basement due to high temperatures. I also found that if I leave a glass out for a couple days it will get the white skin on top. I decided to taste the last one, and it had a definite sour flavor to it. Guessing the culprit was airborne Lacto from my grain mill I started taking extra precautions on not opening fermenting buckets downstairs and only transferring upstairs. Problem went away.
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Old 09-06-2013, 01:41 PM   #8
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Hi all,

Thanks so much for the great replies. We do have a nice dehumidifier, so I think Pedio is probably the culprit. I am pretty manic about sanitizing, but I use StarSan. I will investigate oxygen-based solutions. I don't mill grain in that area, but I do measure bulk grains, and that's probably just as dusty. I will implement all these suggestions and report back!

Thanks again. Love this forum.

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Old 09-06-2013, 01:49 PM   #9
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Quote:
Originally Posted by Einberger1 View Post
Do you mill your own grain and, if so, in the same area you are fermenting and transferring your beer? I ask because I ran into the exact same issue this summer when I had to move all of my fermenting beer down to the basement due to high temperatures. I also found that if I leave a glass out for a couple days it will get the white skin on top. I decided to taste the last one, and it had a definite sour flavor to it. Guessing the culprit was airborne Lacto from my grain mill I started taking extra precautions on not opening fermenting buckets downstairs and only transferring upstairs. Problem went away.
Oh dang, I didn't think about that. I just got a mill and have been milling an arms reach from my ferm chamber.

I also have been having white mold pop up on stuff in my basement in the last few weeks. Not any of my brewing stuff, mostly fabrics, backpacks, etc. Its been a humid summer, so I think a dehumidifier is in order.
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Old 09-13-2013, 06:32 PM   #10
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I can't believe how much water this thing is pulling out of the air...


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