I've been using these big mouth bubbler's as my secondary fermentation now for a few months:

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I was originally using them as primary as well, but being one that makes pretty high gravity beers, I was scared of the pressure build up inside even with a blow off tube, and what could potentially happen if the blow off tube got plugged up and too much pressure built up inside. I am however unsure if having used them as primary before could have potentially weakened the container a from having held a lot of pressure at one point.

Anyway last week I had one filled up with 5 or so gallons and carried it down to my basement as my secondary. And upon setting it on the ground (concrete ground, probably my first mistake), when it hit the ground the bottom shattered and beer went everywhere. I've already fixed that mistake by making a padded area to place these on now when bringing them to the basement, but I'm pretty terrified of this ever happening again.

Is it possible using these as a primary weakened it to make this scenario more likely? Are there other precautions I should be taking to make sure this never happens again? Is this just a constant risk when using large glass containers? Any other horror stories I should know about and strive to avoid? I'm starting to think I shouldn't use glass anymore because I'm terrified this could happen again.

  • 1
    Count your blessings. Many have gone to the ER for shattered carboys.
    – Scott
    Sep 8, 2014 at 19:17
  • I bought a couple chinese made carboys - inconsistent glass thickness, bubbles, and a poorly made nylon carrying strap. Anybody want to buy the remaining one?
    – Pepi
    Jan 17, 2015 at 12:37
  • Just had mine shatter in my bare hands, 9 stitches and surgery to repair a servered nerve...
    – user11884
    Feb 22, 2015 at 2:43
  • I bought one of the 5 gallon glass fermenters, Two 6.5 gallon Plastic siphon less and 3 of the little siphon less glass bubblers so I am very worried about this issue that I just found out about. I had a problem with the spigot a few weeks ago on the little glass bubbler as one cracked by barely tightening the spigot, ruining it and then just last night I poured a gallon of my plum wine into another one of the little bubblers for fermenting and it leaked all over before I could quickly dump it in a pan which I should have checked it with water before committing to the Must but didn't so it was
    – Bill
    Jan 20 at 8:25

8 Answers 8


Northern Brewer/Midwest has come under a lot of pressure as of lately regarding their glass Big Mouth Bubbler product line. They've confirmed that they are curating their reviews that are submitted to the site. If they are negative, they claim to contact the reviewer personally to resolve their complaints and remove the negative review.

If you do a search for the product on Northern Brewer's website and Amazon, you'll see two very contrasting sets of ratings. There is not one mention of it shattering on their review system, and just about every review on Amazon makes mention of it.

People have gone to the E.R. over the Big Mouth Bubbler (blood warning). Consider yourself very fortunate. Many people have reported malformations in the glass since they are individually hand blown. Others claim they don't sit up straight, but the one common trend all have claimed is how thin the glass is. One person even claimed to have seen it flex and wobble when it's full of liquid; something glass should never do!

It shattering on you has little to do with wear and tear, and more with poor construction. The common advice to homebrewers is to not purchase the glass Big Mouth Bubbler. I've heard of no less than 10-20 complaints regarding them all shattering. Do your fellow homebrewers a favor and alert them to this, you may be saving them a very dangerous, even deadly investment. I've also heard a lot of complaints about the poor quality of the plastic version as well, particularly with the lid being difficult to work with. At least the plastic version won't kill you your send you to the E.R. with lacerations.

Contact Northern Brewer/Midwest and have them either refund you or send a plastic replacement. They're support is a stark contrast to this product. I've heard nothing but praise regarding their customer support. It's unfortunate that when it comes to your health and safety (and that of those around/under you when things go awry), the same cannot be said regarding their product, which they are marketing very, very hard.

EDIT: For those showing up late to the game, it would appear that Northern Brewer/Midwest removed their glass Big Mouth Bubblers from Amazon (still available on their own websites), and one can only speculate the cause being the overwhelming negative reviews it received (last time I saw, it was hovering between one to two stars out of five). It would seem that they also have begun to allow one or two (literally, that's all) negative reviews of their products exist on their own sites, again speculating that it's to cover their bases and give the appearance that they don't delete (cough every one of cough) their negative reviews. The advice still stands. Do not buy this product.

  • Wow. Those reviews on Amazon are pretty damning. I hope NB takes this seriously and withdraws the product. Sep 8, 2014 at 20:00
  • After seeing their correspondence with homebrewers, I see no sign of them slowing down. They're continuing to market the heck out of this. It's very unfortunate that it will likely take a lawsuit to cover someone's medical bills or to recoup damages in order for them to take this seriously.
    – Scott
    Sep 8, 2014 at 20:08
  • Anything wrong with the PET BMB? Sep 12, 2014 at 14:29
  • It's not getting nearly the (negative) hype that the glass one is getting, mostly because it isn't sending folks to the E.R., but the amazon reviews for it are scarce and not too positive either. Two things mentioned are inconsistent thickness in the plastic, and the inability to get a good seal with the lid. I also recall hearing one person saying he had to purchase extra seals for it in order to get it to seal properly.
    – Scott
    Sep 12, 2014 at 14:44
  • Northern Brewer is advertising a new and improved version of the Big Mouth Bubbler. I would like to hear if it truly is improved.
    – rlshep
    Jan 27, 2015 at 19:41

Yeah, it pretty much is a constant risk. I broke 3 before I stopped using glass, one of them by just setting it carefully on a carpeted floor. I finally switched over to buckets and wonder why I didn't do it sooner. I've brewed over 400 batches using bucket fermenters and I have yet to find a down side.

  • one of them by just setting it carefully on a carpeted floor, oh man that is rough. Sep 8, 2014 at 15:48
  • I ferment in 10 gallons stainless kegs, but if I hadn't acquired them, I'd be using plastic. Glass carboys are just disasters waiting to happen. Sep 8, 2014 at 18:31
  • 1
    There's been a lot of (supposedly impartial) studies done by the plastic carboy companies that claim that there is little to no difference between glass and plastics as far as final quality of beer. oxygen permeation was surprising since the most permeable part has little to do with the carboy itself, but the lid/bung seal and the plastic airlock.
    – Scott
    Sep 8, 2014 at 19:14

In response to your question about precautions, to add to the other good advice, both Northern Brewer and Midwest Supplies recommend using their brew hauler that is specially tailored to the Big Mouth Bubbler glass fermenter for moving them around. This is probably good advice for any glass carboy -- the cost of this webbing-based system is only about US$10.

  • Do their webbing fit a generic carboy of the same size? I have one from a starter kit I received at Christmas, but have yet to use. Not sure the provenance but it isn't the Big Mouth Bubbler, and seems solid. I intended to use it later in the year.
    – winwaed
    Mar 10, 2015 at 13:04
  • @winwaed -- I haven't tried them out, but the brew haulers/webbing seem to be quite different. Mar 17, 2015 at 2:51

In addition to what others have said, thermal shock could have played a role as well. If the carboy was warm and your concrete floor significantly colder then the temperature shock could have shattered the glass. Your floor mats will now insulate the glass from the very cold floor.


Use a Better Bottle. Obviously not the huge open mouth of the Bubbler, but unbreakable, very safe, and sturdy. Just use some PBW and/or Starsan to easily clean.


I recently received a big mouth bubbler for Christmas and when I went to clean it after fermentation the bubbler shattered in my hands. Luckily I didn't get to cut. I contacted Midwest supply they stated they were had a new manufacturer for the product and would send me out a new big mouth bubbler. I just received it I have not used it yet but it is obviously of much thicker glass. Midwest supply was extremely helpful apologetic and delivered the new car boy within a few days. obviously one has to be much more careful handling any glass object as opposed to plastic but I think the concept is a great one. I hated cleaning the traditional carboys.

  • I would have rather mine shattered while cleaning it and now while it was full of 6 gallons of beer =( Jan 22, 2015 at 14:21

The company got sued. They now produce a new version and the old one is literally gone from the internet sites. The only reason a company would call back their old stock is if they were forced to do so. They no longer make the bubbler caps either. Those were likely considered a potential cause for the exploding carboys. On the flip side, although you don't get the bubble cap, you do get a nice microfiber towel now. And yes, the new glass is thicker, has far less or even no bubbles, and is now marked as "Made in Poland".

Likely, using it as a primary would not have caused this issue. However, as mentioned earlier, heat might have weakened the glass, especially if you don't get your wort completely cool before putting it in the carboy. Also, being that it was full, it may have hit the concrete a little harder than you think. The glass was definitely too thin in the first generation models though, and they had bubbles galore. Thankfully it has been redesigned, but it's a shame it took this much. They should have found this when they were vetting suppliers in the first place, instead of just finding the cheapest.


I personally, would never use any kind of glass carboy for homebrewing. I love spidel plastic fermenters. I use one for fermenting and one for a secondary. Seen too many horror stories of glass breaking cutting arteries, tendons, and other soft tissue. Just not worth it. Besides there is no taste difference between plastic and glass. Some say there is but my brews are loved by dozens and I just don't believe it. On commercial scale for sure.

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