DIY home carbonation

Science
DIY home carbonation
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Repurposing a leftover CO2 cylinder and regulator, maker Joel Miller assembled this DIY home carbonation unit after a quick parts run.

The carbonating process is simple. Fill an empty bottle with the liquid of your choice and refrigerate it. Replace the cap with the special one you made and attach the quick-disconnect hose to it. Make sure the shutoff valve on the regulator is closed, then slowly open the main valve on the tank until the regulator shows pressure. Adjust the output pressure to about 45psi and open the shutoff valve, pressurizing the bottle. Now loosen the cap on the bottle just slightly while squeezing any air space out of the neck of the bottle, then tighten the cap. This will purge any air from the bottle and replace it with CO2. Now shake the bottle vigorously for about 20-30 seconds; this will help dissolve the CO2 into the liquid faster. Shut off the CO2 at the regulator and disconnect the hose from the quick-disconnect fitting. You can now remove the special cap (slowly, the contents are now carbonated!) and replace it with a regular cap.

So on the first day I made seltzer water. On the second day I carbonated apple juice, grape juice, and Gatorade, and ended the evening with a carbonated vodka martini (nice!). What else can I carbonate?

Just to be on the safe side, Joel also mentions:

VERY IMPORTANT: Apparently there is a chemical reaction between the CO2 dissolved in water and copper (or copper alloys like brass) that creates a toxic substance that will make you sick. Never use brass or other copper-based fittings with seltzer! All of these fittings (or at least the ones that will be in contact with the seltzer for any length of time) are either zinc-plated steel or stainless.

14 thoughts on “DIY home carbonation

  1. Simon says:

    Cool, a home made soda stream!

    http://www.sodastream.co.nz/

  2. FizzGiz says:

    Only thing I’d do different is replace parts #8, 9 & 10 with a Fizz Giz valve cap (two bucks) #AND# parts #6 & 7 with a hand-operated air blower (equipped with a Fizz Giz nozzle tip). Obviously, keep part #4 (the hose) and attach the hand squeeze air blower to it. This short clip will show you the modified result: http://www.youtube.com/watch?v=lRgfsa8zOio

  3. Anonymous says:

    Carbonating water at home to make seltzer using a CO2 gas supply and ordinary soda bottle.
    __________
    Nancy.
    building

  4. William Stubbs says:

    Regarding the note in this article warning against the use of brass & copper, the CO2/water mixture will only come in contact with your carbonation cap: a regulator that uses brass fittings should be fine.

  5. William Stubbs says:

    Regarding the note in this article warning against the use of brass & copper, the CO2/water mixture will only come in contact with your carbonation cap: a regulator that uses brass fittings should be fine.

  6. William Stubbs says:

    Regarding the note in this article warning against the use of brass & copper, the CO2/water mixture will only come in contact with your carbonation cap: a regulator that uses brass fittings should be fine.

  7. Anonymous says:

    I built this same thing. Turns out my part#8, which was the same that is detailed in the instructions, rusted out on me after about 2 weeks.  I recommend spending a little more and going with the stainless steel one designed for air and water usage. 

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I make cool stuff and write about other people making cool stuff on makezine.com. If you have something you think I should see, send me a tip.

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