Return to Cold Crash Guardian - Oxygen-Reducing Cold Crash Blowoff System

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Works as described Monday, September 28, 2026 Reviewer: Joseph mesarick from steelton, PA United States   Definitely helps solve the problem of oxygen creep during cold crashing.  My first go with it was a Duvel clone and I attached the bag a little bit too early, but the excess CO2 vented into the blow-off jug, so all worked out in the end.  It used about a half to 3/4 bag of CO2 during crashing, so it definitely did something. I'd definitely recommend to anyone using a cold crash method that could possibly introduce O² to your beer. All of that hard work and effort is well worth the money spent on the Guardian. Thanks guys, for making the home rew hobby even better! Was this review helpful to you?

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Added a 2nd to my brew house Monday, August 24, 2026 Reviewer: Jonpierre Castech from Tehachapi, CA United States   This is the second CCG I’ve purchased. The first is going strong, I just needed another. I highly recommend this product. Was this review helpful to you?

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Worked great with some tweaks Wednesday, May 20, 2026 Reviewer: Anonymous Person from San Diego   Only used it once so far, but it worked great with a few tweaks. - Make sure you pay attention to the on/off valve - it slips and will just dump the air in/co2 out rather than collecting it in the bag.  Mod's to help it work better for me - I put a T valve between the bag and the sanitizer with an on/off on each leg so I could turn off the sanitizer and connect my CO2 tank to fill up the bag (or turn off the co2 in line so it goes to the sanitizer only).  I'm doing two batches in Speidels with lots of head space, so the large bag wasn't large enough for what I needed.  Having the ability to refill the bag with CO2 when draining the fermenters did the trick. Was this review helpful to you?

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Cold crashing! Thursday, May 14, 2026 Reviewer: Jesus Garcia from Stockton, CA United States   I have a couple of these and they work well! No issues with cold crashing. Highly recommend this product. Easy to use and reliable. Was this review helpful to you?

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Great product - easy to use Thursday, May 14, 2026 Reviewer: Rick Klinc from Haymarket, VA United States   I use this product during Cold Crash and doing a closed transfer to a keg afterwards. It is such a simple design and yet so effective at what it does. Would be lost without it! Was this review helpful to you?

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Amazing design Thursday, April 23, 2026 Reviewer: Scott Bentkover from Libertyville, IL United States   Thank you for making such great products.  Worked exactly as expected. Was this review helpful to you?

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Tuesday, March 10, 2026 Reviewer: Michael Chiodo from Bridgeville, PA United States   Was this review helpful to you?

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Great solution to an age old problem! Friday, September 5, 2025 Reviewer: Matthew Murphy from Lafayette, CO United States   This is well thought out, and is a great way to reduce your oxygen intake. I like that you don't need to rely on a CO2 bottle. I can pull a sample or chill without watching O2 bubble into the fermenter. Was this review helpful to you?

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Definately Solved My Cold Crash Vacuum Problem Friday, September 5, 2025 Reviewer: Ray Monhan from Millington NJ   This worked exactly as described. If you cannot pressurize your fermenter, this will work for you when cold crashing. Easy to clean and sanitize. Was this review helpful to you?

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Wednesday, March 12, 2025 Reviewer: William Riley from North Vancouver, BC Canada   East to set up. Collector bag filled quickly. It remains to be seen whether the collector holds enough CO2 to prevent Oxygen ingress or the check valve holds. I'll report again after  dry hopping and cold crash is complete. Was this review helpful to you?