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The Catalyst Fermentation System

(3 reviews) Write a Review
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This product is currently on backorder from the supplier. 


The Catalyst is an amazing addition to your brewing equipment. This fermenter simplifies the fermentation process by allowing you to skip the secondary fermentation stage. 


General Info

  • Easy to use and easy to clean
  • Trub collector is compatible with any wide mouth jar to eliminate transfers.
  • Conical tank with 45˚angle
  • Silicone gasket with multi-surface contact to ensure a perfect seal
  • Strong and durable stand, designed with I-Beam and honeycomb structure
  • Includes a proprietary 3” butterfly valve. The largest in the industry
  • All steps in one vessel: Primary, Secondary, Harvest Yeast and Bottling
  • 6.5 Gallons

3 Reviews

  • 5
    Haven't used it yet

    Posted by Daniel G. on Feb 6th 2018

    Went together easily when I received it and seems solid. I'll have to give a real review after I brew a batch through it.

    I'm waiting for some supplies to get here so I can use it to make some Cooper's Pale Ale. Cooper's is the most popular beer in Australia as I found out on my 6-week visit there. My son gave me a brew-in-a-can to bring back. Come to find out that is the LME with hops already added in and a pack of Cooper's Yeast stuck to the lid. The Cooper's yeast is integral to getting the right flavor out of the brew and the reason I hadn't done my own clone previously. My son has lived in Oz for 12 years now and Coopers is "the" beer. Couldn't brew it here in the US until very recently because the Cooper's yeast was unavailable in the US. I actually ordered the Cooper's yeast from an Australian company while I was in Australia and a US company that I have ordered from before actually supplied it. So I now have some in my freezer and I plan on harvesting some from the brew.

    Anyhow, my brew-in-a-can came with the yeast but it suggested I add their DME and some Dextrose for the best results. I'm waiting for those to be delivered and then I'll "do the brew". I'll have to write a real review after I've made at least one batch with it.

  • 4
    Almost perfect

    Posted by Matt H on Dec 8th 2017

    I bought this in April of 2017 and have brewed a 5 gallon batch a month in since. I have used buckets, carboys, and a friend has the fast ferment system and this is far superior to all the "entry" level brewing fermenters. It's a nice design, very well built with a sturdy frame and I really enjoy the food grade plastic chamber with its completely open top for easy cleaning and beer filling. The trub trap is great and really helps with making clear beer by removing everything you don't want going into your keg or bottles. It's also fantastic for dry hopping or adding fruit, coffee, or whatever else you enjoy in your brews.
    However there are three things that I would like to see changed to make this fermenter perfect.

    First - It needs to be increased from 5.5 gal to 6 gal capacity. I brew 5 gal batches and there isn't enough head room for fermentation to use standard airlocks. It will blow them out guaranteed! You must use an overflow, not a big deal but it would be nice to just use an airlock.
    Second - The funnel for the bottom could use a bigger hole for draining beer into kegs. It takes forever! It would be fine if there was just an option to purchase one with a bigger hole so you could have a bottling and a kegging funnel that would be great.
    Lastly - This is the biggest issue. The rubber gasket/seal around the top falls out of the rim every time you take the lid off and it is a B***H to get back in place. I actually superglued mine in place after the 3rd time this happened.

    Overall this is still hands down the best fermenter I own/have used and will buy another couple in the future but those few changes sure would be nice.

  • 5
    Best in class!

    Posted by Christopher W. on Apr 5th 2017

    I've used several small systems like this before. Some of them ok, other not so good. This one though... if I could I would have one in every room. Love it! Greetings from Sweden!