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Old 11-26-2007, 12:40 PM   #1
Diablotastic's Avatar
Nov 2007
Northbridge, MA
Posts: 217

I'm using a Better Bottle (6 gal) for my primary now and just hooked up a blow-off tube.

My friend mentioned that I should have used sanitized water in the blow-off tube vessell because when fermentation starts a little water ends up getting sucked up but I used plain old tap water.

What do you guys generally use in your blow-off tube vesell?
The Metal Kettle Brewery
Rockdale USA est 2007

KEGGED:Orange Kolsch (BM's)
KEGGED:House Rye Pale Ale
ON DECK:Centennial Blonde

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Old 11-26-2007, 01:50 PM   #2
wizardofza's Avatar
Jun 2007
Buffalo, NY
Posts: 384
Liked 3 Times on 2 Posts

I use a half-gallon growler filler with iodophor/water mixture. I've used plain water in the past as well with good results, but recently change to the iodophor mixture just to be on the safe side.

I've never had a problem with the blowoff sucking water back into the carboy, I can't even imagine how that would happen....

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Old 11-26-2007, 02:47 PM   #3
McKBrew's Avatar
Oct 2006
Hayden, Idaho
Posts: 8,204
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I use a small pitcher with about a quart of regular strength star san.
Make Beer, Not War.

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Old 11-26-2007, 03:15 PM   #4
TheJadedDog's Avatar
Aug 2006
People's Republic of Cambridge
Posts: 3,316
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I typically use a plastic gallon jug (like what milk comes in) half full of iodophor solution (I just use what's left over from sanitizing my brew day equipment). Works very well.
And now we go AG!

On Tap: Nadda
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Old 11-26-2007, 03:37 PM   #5
Beerrific's Avatar
Mar 2007
Posts: 5,562
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I always put on an air lock first and fill it with star san. If there is any suction, I can rest easy know only star san is getting pulled in. After fermentation starts, if I think I am going to need a blow-off, I put one on into a jug with water (or star san if I have some old lying around). Since by that point there will be no suction there is little to worry about.

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Old 08-16-2010, 05:17 AM   #6
Nov 2009
Posts: 14

Well I just had it happen. I ferment in a temp controlled chest freezer. Fermentation was done so I crashed to 33f. I forgot about the half-gallon growler filled with just water as a blowoff. all was sucked back into the 2 batches which im hoping and assuming will be just fine so when you cold crash take off the airlock or blowoff.

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Old 08-16-2010, 05:55 PM   #7
Mar 2010
Posts: 36
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I use a skinny pint bottle with about an inch of cheap vodka in the bottom.

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Old 08-16-2010, 06:36 PM   #8
Mar 2010
Cambridge, ON
Posts: 565
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I just use a half gallon jug with about an inch or so of water in the bottom. Never had any problems and can't imagine that any water would get sucked back into the fermenter. There is so much positive pressure in the carboy I don't see how it would happen.

After high krausen is done I'll switch out the blow off tube for an airlock.

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Old 08-16-2010, 06:43 PM   #9
May 2010
port orchard, wa
Posts: 44
Liked 1 Times on 1 Posts

Suck in happens when you cool the wort only enough to pitch, and not to room temp of where youre storing it. Also slow starting yeast will contribute because the longer they take to get active, the longer the wort has to cool and start this vacuum. The only real ways to eliminate this are to use a yeast starter to make sure the lil beasties are active when you pitch, cool your wort closer to room temp, or use a blowoff tube instead of an airlock (this will require a lot more force to suck up).

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