My sister Eleanor loves seltzer water. She was buying 10-15 of these 1 liter bottles of seltzer every week, and it wouldn’t even last her the whole week. And it was a huge waste of bottles. I looked into making my own home carbonation system. The two best information sources were Carbonating at Home and of course, my favorite, Instructables.com.
I wasn’t in a big hurry to get all the equipment, so I waited until I found a good deal on craigslist. A guy was selling a 20 lb CO2 tank with a regulator and a couple of gauges for $50. It looked in pretty bad shape, and he couldn’t confirm whether it worked or not, so I talked him down to $40 and picked it up.
I liked how old and industrial it looked. Antique crap. The tank didn’t have any CO2, so I brought it down to the local South Philly Propane place, and instead of filling the tank, they just took my old one and gave me a new one that was filled. $17.
Unfortunately, the regulator didn’t work, so $40 got me a steel CO2 tank, which is actually pretty great since they cost about $100 new. Maybe I can part it out and sell the pressure gauges and fittings.
So I searched eBay and waited to get a deal on a CO2 regulator. These usually cost about $50, but I was able to get a dual-guage Cornelius one for $35 with shipping included.
Then I went to Lowe’s to get some 1/4″ braided vinyl tubing (~$2 for 7 feet), a ball valve (~$6), some barbed 1/4″ fittings (3 at $2 each) that would connect the tubing to the regulator and to the ball valve. I got some clamps to secure the ball valve onto a piece of board which I secured to the side of the cabinet next to the sink. This is the on-off switch for the user, Eleanor. The tank is under the sink — ugly and hidden away — and turned on, so it’s pumping CO2 to the ball-valve. It’s important to check for leaks at the tubing attachment points between the tank and the ball valve. You’ll either hear a hiss, or you can lather soapy water and see if it bubbles.
Peter got a presta adapter and we had some old presta bicycle tubes lying around. I drilled a hole in a bottle cap and stuck the presta valve through it and tightened it down with a presta nut. We can make a bunch of these presta caps so that if one gets gross, we can use another one interchangeably. Just stick that presta adapter on it and let the CO2 pump through.
I put a hose clamp on everywhere where the tubing was making an attachment. Four of those.
There it is under the sink. Just leave the tank turned on so that you don’t have to reach under there and open the valve every time you want seltzer. Just use the switch at the ball valve.
I adjusted the CO2 regulator to 60 psi. You fill a plastic bottle with water up to where the bottle starts curving. You want some headspace so that there’s some room for the CO2 to get pumped in. You have to chill the water because CO2 dissolves better in cold water. So when it’s cold, you screw on the bottle cap with the presta valve attached, “burp” out the air in the headspace (meaning you just squeeze the bottle until the water gets up to the cap), and then inject the CO2. The bottle expands as the CO2 enters. Keep the presta adapter attached to keep the CO2 flowing into the bottle, and start shaking it up. Do this for maybe 10 seconds. Then turn off the CO2 using the ball valve, and shake the bottle more.
When you unscrew the bottle cap, hopefully you’ll hear a big hiss and see the water fizz. At 60 psi, we’re getting really sharp, super-saturated seltzer.
What we need to do is start discovering other drinks to carbonate. I want to try milk and orange juice. Recarbonating old, flat soda would probably work too. It’ll be great to have a special carbonated drink for dinner parties. Impress your friends! What a blast!

















