Video taken by my 9 year old son on my phone:
You can get a large tank at any welder/gas supply place. The hardware to connect the large tank to the small one was purchased at www.co2doctor.com. I should also mention that in this video I'm using a replacement valve on the sodastream tank that allows them to be filled quickly. I have had good luck refilling tanks with the original valve, but you have to do it very slowly. To get the best fill freeze the empty soda stream tank ahead of time. It also doesn't hurt to have your larger donor tank warm.
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