Big Oxygen System

  • Item #S94
  • Price: $69.99
  • Part #
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In stock, will ship on Saturday, September 18

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Why aerate your wort? Yeast needs oxygen to reproduce and produce strong cell walls. If the cell walls are weak, the yeast will have a low tolerance for alcohol, and can die before fully fermenting out the wort. Particularly in worts with starting gravities in excess of 1.050, this can contribute to long lag times, slow ferments, and higher than normal finishing gravities. Like an air stone in a fish tank provides oxygen for fish to breathe, wort aeration provides needed oxygen for yeast respiration and growth.

This Big Oxygen System is the largest Oxygen Aeration System we have, and features a 0 - 4 cfm oxygen regulator, 4' of tubing, and our rigid 22" oxygen aeration wand with a .5 micron sintered stainless steel stone. 

The pictured 20 cubic foot oxygen tank is not included - get a full tank of welding grade oxygen at a welding supply with a CGA-540 valve outlet (the welding industry standard).

To use, first assemble the tubing and wand and install the regulator on the full tank of welding grade oxygen you have sourced at a welding supply. Turn on with the regulator set to O and put the wand into your 5 gallons of beer. Turn on the regulator to to 1/2 LPM (liters of oxygen per minute) and let run for 20-30 seconds for worts with starting gravities up to 1.079, and for 60 seconds for worts with starting gravities over 1.080. One fully charged tank will treat at least 250 batches of beer based on this one the 30 seconds at 1/2 LPM setting.

Note: Before ordering, we recommend you call around and locate a welding gas supplier who will provide you with a deposit/exchange tank of welding oxygen, or who will fill a tank that you own. The tank must have an industry standard CGA 540 oxygen valve. Around here, it costs about $30.00 to exchange a 20 cubic foot tank of oxygen at a welding supply. This 20 cubic foot tank is good for adding oxygen to at least 250 five gallon batches of beer.




Average rating 9.42857142857143 out of 10 ( based on 14 reviews )

Fantastic O2 Aeration!

Review by Kevin on 10/20/2013

This system is ideal for many applications. The want is long enough to reach into many types of fermenters. It is also very easy to clean this device. Just get a small O2 tank from your local welding supply store and you are good to go.

Big O2 system

Review by Thomas on 5/24/2014

Good: It works great. The rod is 22" long, enough for 6 gal carboys or for my 14 gal conical fermenter. Not so good: It comes with only 3' of 1/4" OD tubing. That's enough hose if you have your 20lb O2 bottle close to your carboy. I needed 10' of tubing to get comfortably into my conical fermenter. Not a big deal...the tubing is cheap...$3 or so for 10 feet at your local hardware store. Otherwise, it is great I like it because I can control the flow of O2 so that I know how much oxygen I am delivering to my wort each time I brew.

Big Oxygen System

Review by Crows Nest on 6/1/2014

Works as advertised. Easy to use, and takes the guess work out of aeration. Highly recommended!

Better than disposable O2

Review by MDIBuckeye on 6/15/2014

Great O2 set up that will last for years per bottle!

O2 system

Review by Timothy on 7/22/2014

--Simple, easy and quick system to add O2 to wort before pitching yeast. As advertised!

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Jan 03, 2021 by Fernando Verli

Q: For a 25 gal batches, d<1,075, 1LPM and 2sec is a good choice ? Thanks

A: Yes, these are good initial settings.

Jan 10, 2019 by Nick Hill

Q: How long do you run the oxygen for 15 gallon and 35 gallon batch?

A: Try 1 minute for the 15 gallon and 2 minutes for the 35 gallon batch.

Jun 05, 2018 by Kathi

Q: When using this set up, is an inline filter needed?

A: We do not think it is needed.

May 01, 2018 by Craig

Q: Is the stainless steel stone removable?

A: No

Apr 20, 2017 by Tracy

Q: In the "Yeast" book it says the ideal injection rate with a .5 micron stone for 5.3 gal of 1.077 wort is 1LPM for 60 seconds to reach 10-14 ppm. Why do you recommend less? Also, for 10 gallon batches is the conversion linear? Do you double the time?

A: For 10 gallon batches, double the time or the flow rate. We recommend less, because we have had great results with just a little bit of pure oxygen injected into wort.

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